Practice Test


Q1) Growth is defined as Show Answer


Q2) In unicellular organism growth is shown by Show Answer


Q3) In living organisms, growth is Show Answer


Q4) During germination due to water, ________ enzymes become active. Show Answer


Q5) In hypogeal germination Show Answer


Q6) In hypogeal germination, due to the elongation of _______ plumule comes out of the ground. Show Answer


Q7) Hypogeal germination is found in Show Answer


Q8) Hypogeal germination is seen in Show Answer


Q9) During epigeal germination of seed Show Answer


Q10) Vivipary is the characteristic feature of Show Answer


Q11) Vivipary germination is observed in Show Answer


Q12) Vivipary is the germination Show Answer


Q13) Epigeal germination is found in Show Answer


Q14) On the basis of the type of seed germination identify the ODD one. Show Answer


Q15) In hypogeal germination, the cotyledons of seed never become photosynthetic as they Show Answer


Q16) Germination takes place when the Show Answer


Q17) First visible sign of germination is Show Answer


Q18) Oxygen is essential for seed germination because Show Answer


Q19) Which of the following is/are common to both hypogeal and epigeal types of seed germination ? Show Answer


Q20) Plant growth is Show Answer


Q21) Changes due to growth is Show Answer


Q22) Meristematic cells have the capacity Show Answer


Q23) The meristem which is present from embryonic condition is called Show Answer


Q24) Development in organisms involves Show Answer


Q25) Growth is maximum in the zone of Show Answer


Q26) In a growing plant, the very first phase during the process of growth is Show Answer


Q27) Formation phase is Show Answer


Q28) In lag phase, growth is Show Answer


Q29) Maximum rate of growth occurs in Show Answer


Q30) Growing plants in dark that causes bending and reduction in size is Show Answer


Q31) In root,the region of fastest growth is Show Answer


Q32) The term 'Grand period of growth' was given by Show Answer


Q33) The growth of a plant in log phase is Show Answer


Q34) The phenomenon of growth is immediately followed by Show Answer


Q35) Growth period of plant between seed germination to flower formation is called Show Answer


Q36) In the apical region of a young angiospermic stem, log phase of growth can be seen in the region of Show Answer


Q37) In the apical region of a young angiospermic root, the growth changes which occur during cell differentiation and maturation correspond with the Show Answer


Q38) Highest auxin concentration occurs Show Answer


Q39) Among the following synthetic auxin is Show Answer


Q40) Which of the following plant functions is not controlled by auxins ? Show Answer


Q41) Growth hormone responsible for apical dominance is Show Answer


Q42) I.A.A. stands for Show Answer


Q43) Which of the following effects of auxins on plants is used for commercial application ? Show Answer


Q44) Avena curvature test was done by Show Answer


Q45) Which of the following is used as a weedicide ? Show Answer


Q46) Naturally occurring auxin is Show Answer


Q47) Substances formed at the stem tip and controlling growth elsewhere are Show Answer


Q48) Auxin suppresses the growth of Show Answer


Q49) Higher concentration of some synthetic auxins is used for Show Answer


Q50) Movement of auxin is Show Answer


Q51) Auxin synthesis occurs in Show Answer


Q52) Auxin takes part primarily in Show Answer


Q53) What is false about auxin ? Show Answer


Q54) Natural auxins are synthesized from Show Answer


Q55) Abscission layer is formed when the concentration of Show Answer


Q56) Which of the following hormone is translocated to other parts of the plant and exibit a polar movement ? Show Answer


Q57) Auxin which is highly efficient in the induction of roots on stem cutting in the Show Answer


Q58) Commercial use of auxin is Show Answer


Q59) 2, 4-D causes Show Answer


Q60) Removal of apical bud result in the Show Answer


Q61) Fruit drop is prevented by spraying Show Answer


Q62) First chemical identification of auxin. indole 3-acetic acid, was carried out by Show Answer


Q63) Which of the following is used in root formation on stem cuttings ? Show Answer


Q64) Growth curve in plant is Show Answer


Q65) Apical dominance is Show Answer


Q66) Apical dominance includes the Show Answer


Q67) Auxins differ from other regulating compunds in plants because auxins Show Answer


Q68) Which of the following stimulates cell division ? Show Answer


Q69) Some early experiments on phototropic curvature in glasses led to the discovery of Show Answer


Q70) An important finding in Went's experiment was Show Answer


Q71) Parthenocarpy can be achieved by Show Answer


Q72) Avena coleoptile auxin is Show Answer


Q73) Prunning of plants promotes branching due to sensitization of axillary buds by Show Answer


Q74) What is the role of auxin ? Show Answer


Q75) Apical dominance is caused by Show Answer


Q76) More auxins than cytokinins initiates Show Answer


Q77) Which of the following hormone is concerned chiefly with root initiation ? Show Answer


Q78) For rooting on stem cuttings or on leaves of Bryophyllum the growth regulator used is Show Answer


Q79) Apical dominance in higher plants is due to Show Answer


Q80) The pineapple, which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by the application of Show Answer


Q81) Internodal elongation is stimulated by Show Answer


Q82) Bakanae disease of rice is due to Show Answer


Q83) Which of the following physiological effects is caused in plants by gibberellic acid ? Show Answer


Q84) Gibberellin was first extracted from Show Answer


Q85) Gibberella fujikuroi is a/an Show Answer


Q86) Gibberellin was first discovered by Show Answer


Q87) Gibberellins induce Show Answer


Q88) Dwarfness can be controlled by treating the plant with Show Answer


Q89) Gibberellins bring about Show Answer


Q90) Gibberellins promote Show Answer


Q91) Size of grapes are increased by the application of Show Answer


Q92) Gibberrellic acid includes flowering Show Answer


Q93) Mobilization of stored food in germinating seeds is triggered by Show Answer


Q94) Seed dormancy can be broken by the spray of Show Answer


Q95) Cut or excised leaves remain green for long, if dipped in Show Answer


Q96) Cytokinin Show Answer


Q97) 'Richmond Lang effect' refers to the Show Answer


Q98) The Richmond-Lang effect pertains to Show Answer


Q99) For plant tissue culture, which among the following is required ? Show Answer


Q100) The hormone produced during adverse environmental condition is Show Answer


Q101) Senescence is the Show Answer


Q102) What is true about ethylene ? Show Answer


Q103) Out of following which one is known as a secondary hormone ? Show Answer


Q104) The effect of ethylene is inhibited due to Show Answer


Q105) Which of the following acts as the precursor for the biosynthesis of ethylene in plants ? Show Answer


Q106) Ethylene is Show Answer


Q107) Which one produces more ethylene ? Show Answer


Q108) Hormone capable of replacing the requirement of long photoperiods for flowering is Show Answer


Q109) Fruit ripening is accelerated by Show Answer


Q110) Growth of lateral branches is promoted by Show Answer


Q111) When seedling tip cut off, growth and light induced bending stops because it inhibits Show Answer


Q112) The chemical nature of kinetin is Show Answer


Q113) Abscissic acid (ABA) promotes Show Answer


Q114) Balanced combination of cytokinin and auxin helps in Show Answer


Q115) Hormone discovered through tissue culture technique is Show Answer


Q116) Hormone primarily related to cell division is Show Answer


Q117) Apical dominance is due to Show Answer


Q118) Which hormone is called stress hormone ? Show Answer


Q119) Artificial ripening of fruits is accomplished by Show Answer


Q120) Ethylene gas Show Answer


Q121) Development of shoot and root is determined by Show Answer


Q122) The regulator which delays the onset of senescence in plant is Show Answer


Q123) First natural cytokinin was discovered by Show Answer


Q124) Hormone that promotes growth of lateral buds has negative effect on apical dominance is Show Answer


Q125) Richmond-Lang effect is due to Show Answer


Q126) The name 'zeatin' was coined by Show Answer


Q127) Which of the following is a cytokinin ? Show Answer


Q128) Hormone found in liquid endosperm of coconut is Show Answer


Q129) A plant hormone that induces morphogenesis in plant tissue culture is Show Answer


Q130) Bioassay of IAA is Show Answer


Q131) Induction of cell division and delay in senescene are due to Show Answer


Q132) Cytokinins Show Answer


Q133) Flowering of Chrysanthemum is inhibited by Show Answer


Q134) Abscissic acid, the stress related hormone, also Show Answer


Q135) Stress hormone produced during adverse environmental condition is Show Answer


Q136) Abscissic acid controls Show Answer


Q137) Which of the following induces flowering in short-day plants ? Show Answer


Q138) During drought, plants develop hormone Show Answer


Q139) Plant hormone causing abscission of leaves, senescence, bud dormancy and inhibition of cell division is Show Answer


Q140) Abscissic acid causes Show Answer


Q141) The hormone which promotes flowering in long day conditions and controls sex expression is Show Answer


Q142) Seedless tomatoes are produced by Show Answer


Q143) In autumn, leaf fall occurs because Show Answer


Q144) Stomatal closure under stress condition is due to Show Answer


Q145) Abscissic acid causes Show Answer


Q146) A plant hormone used for inducing morphogenesis in plant tissue culture is Show Answer


Q147) What will happen if apical bud is removed in a flowering plant ? Show Answer


Q148) Hormone responsible for senescence is Show Answer


Q149) The length of the plant can be increased by Show Answer


Q150) Agening of plants is related to which of the following hormone ? Show Answer


Q151) Deterioration process in plants, that naturally terminates their functional life is called Show Answer


Q152) Flowering in pineapple can be induced by the application of Show Answer


Q153) In horticulture, an important root inducing chemical is Show Answer


Q154) Physiological function not influenced by ABA is Show Answer


Q155) High auxin and low cytokinin concentration produce Show Answer


Q156) ________ hormone enhances the shelf life of leafy vegetables like spinach, lettuce and vase-life of flowers. Show Answer


Q157) Identify the precursor substance among the following used in the biosynthesis of gibberellins in plants. Show Answer


Q158) Genetically, dwarf pea plant can become phenotypically tall if treated with Show Answer


Q159) Inhibition of seed germination can be done by Show Answer


Q160) Hormone responsible for plant and seed dormancy during drought is Show Answer


Q161) Growth movements in response to light and dark period are called Show Answer


Q162) In general the length (duration) in hours of a critical photoperiod is comparatively Show Answer


Q163) When the dark period of short day plants is interrupted by a brief exposure of light, the plant Show Answer


Q164) Which one is not affected by light ? Show Answer


Q165) In many plants the change from vegetative to reproductive phase takes place in response to Show Answer


Q166) Which event does not take place in short day plants ? Show Answer


Q167) In short day plants, flowering is induced by Show Answer


Q168) Effect of the day length duration on plant development and flowering is Show Answer


Q169) A long day plant is Show Answer


Q170) A chemical believed to be involved in flowering is Show Answer


Q171) Florigen is synthesized in Show Answer


Q172) Flowering is influenced by Show Answer


Q173) Photoperiodic stimulus is perceived by Show Answer


Q174) Photoperiodism is probably due to the synthesis of Show Answer


Q175) Pigment taking part in photo-perception of flowering is Show Answer


Q176) Garner and Allard are connected with Show Answer


Q177) Photoperiodism was discovered in a variety of ____ plant. Show Answer


Q178) Synthesis and action site of florigen is Show Answer


Q179) Which is plant SDP ? Show Answer


Q180) Which plant is LDP ? Show Answer


Q181) Photoperiodism was first characterised in Show Answer


Q182) Photoperiodic induction can be produced Show Answer


Q183) Which of the following is a long day plant ? Show Answer


Q184) Which of the following hormones can replace vernalization ? Show Answer


Q185) Winter variety of Petkus rye can flower Show Answer


Q186) Vernalization is Show Answer


Q187) Find the ODD one out. Show Answer


Q188) Suitable temperature range for vernalization is Show Answer


Q189) The reversal effect of vernalization is called Show Answer


Q190) Which hormone is produced due to vernalization Show Answer


Q191) By which process can biennials can be converted to annuals ? Show Answer


Q192) Which is a devernalization factor ? Show Answer


Q193) In which plant does the seed germinate while it is still attached to the main plant ? Show Answer


Q194) Germination seen in groundnut is Show Answer


Q195) Growth in numbers is maximum in the zone of Show Answer


Q196) Choose the correct sequence of stages of growth curve in bacteria. Show Answer


Q197) The sigmoid curve has the shape of English letter Show Answer


Q198) Dwarfness of plant is controlled by treating it with Show Answer


Q199) Which of the following is a natural growth inhibitor ? Show Answer


Q200) In unisexual plants, sex can be changed by the application of Show Answer


Q201) Plant material used in tissue culture is Show Answer


Q202) Exogenous GA induces the formation of male flowers on genetically female plants of Show Answer


Q203) Who amongst the following is a discoverer of auxin ? Show Answer


Q204) Abscission is characterized by Show Answer


Q205) Which hormone can induce flowering in long day plants ? Show Answer


Q206) Plant growth hormones extracted from a fungus and a fish are respectively Show Answer


Q207) When mature green bananas are put in a sealed plastic bag, they remain green for many days. However, if they are sealed with a ripe orange, the bananas turn yellow within a few days. The reason is Show Answer


Q208) Common inhibitor of germination is Show Answer


Q209) Which is not a natural plant hormone ? Show Answer


Q210) Which one prevents premature fall of fruit ? Show Answer


Q211) Hormone produced during leaf fall is Show Answer


Q212) Identify the ODD one from the following . Show Answer


Q213) Which of the following is an antigibberellin ? Show Answer


Q214) Bioassay of auxins is Show Answer


Q215) Chrysanthemum flowers in winter because Show Answer


Q216) Which is short day plant ? Show Answer


Q217) If a tree flowers thrice in a year in october, january and july in northern India, the plant is Show Answer


Q218) 'Vernalization' term was coined by Show Answer


Q219) Total time required for the completion of three phases of growth is called Show Answer


Q220) The rate of growth gradually slows down during Show Answer


Q221) Went isolated auxin from Show Answer


Q222) Rapid and dramatic increase in shoot length is called Show Answer


Q223) Environment heterophylly is seen in Show Answer


Q224) Genetically dwarf plants can be induced to grow tall by using Show Answer


Q225) Increased growth per unit time is termed as Show Answer


Q226) Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure? Show Answer


Q227) A plant have 13 hours critical day light under which condition it will flower
Duration of light period & Duration of dark
period Show Answer


Q228) The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as Show Answer


Q229) The phytohormone that induces cell elongation is known to be produced by a fungus. The asexual stage of
this fungus is called Show Answer


Q230) Cytokinins are mostly Show Answer


Q231) Geotropic response is perceived by Show Answer


Q232) Natural cytokinins are synthesized in tissue that are Show Answer


Q233) Which of the following processes is concerned with Cholodny-Went theory? Show Answer


Q234) Growth at cellular level is the increase in the amount of Show Answer


Q235) Which one of the following is a natural growth inhibitor? Show Answer


Q236) I. Antagonist to GA
II. Promoted bud dormancy
III. Promoted stomatal closure
IV. Promoted abscission layer
Identify the hormone/s which promote/s all these events in plants and choose the correct option Show Answer


Q237) Thigmotropism is best seen in Show Answer


Q238) In coleoptile tissue, auxin is Show Answer


Q239) Which of the following induces flowering in long day plants? Show Answer


Q240) Fruits can be left on the tree longer, so as to increase the market period. This is due to the function of Show Answer


Q241) For cryopreservation, plant materials are frozen at Show Answer


Q242) Maximum elongation takes place in Show Answer


Q243) One hormone helps in ripening of fruits, while the other stimulates closure of stomata. These are
respectively Show Answer


Q244) Micropropagation is done by Show Answer


Q245) Auxanometer is used to mesure Show Answer


Q246) The cut flowers and vegetables can be kept fresh for a long period by this plant hormone Show Answer


Q247) Photoperiodism was first characterized in Show Answer


Q248) Hydroponics is a system of growing plants in Show Answer


Q249) If a plant need 10 hours darkness than identify the condition under which it will flower
I. 14 hours day period
II. 10 hours dark period
III. 9 1/2 hours dark period
IV. 9 hours dark period
Choose the correct option Show Answer


Q250) The stress hormone that helps plant to respond drought is Show Answer


Q251) Auxins promote Show Answer


Q252) Respiratory climacteric is related with Show Answer


Q253) I. Increased vacuolation
II. Cell enlargement
III. New cell wall deposition
Which of the above are the characteristics of phase of elongation?
Choose the correct option accordingly Show Answer


Q254) Coiling of garden pea tendrils around any support is an example of Show Answer


Q255) Internodal elongation just prior to flowering in beet, cabbage and in many plants with rosette habit is
called Show Answer


Q256) Member of auxin, which is widely used to kill the dicotyledonous weed is Show Answer


Q257) Identify to which plant hormone, the given function belongs
I. Initiates flowering in pineapples
II. Induces flowering in mango
III. Root growth and root hair promotion
Show Answer


Q258) Growth period of plant is generally divided into Show Answer


Q259) Difference between kinetin and zeatin is Show Answer


Q260) Auxanometer is used to detect Show Answer


Q261) Auxin was isolated by Show Answer


Q262) The most common auxin is Show Answer


Q263) Which plant hormone is found in gaseous form? Show Answer


Q264) Auxin in plant means for Show Answer


Q265) Grand place of growth is an another name of Show Answer


Q266) Which of the following movements in plants is due to the increased concentration of auxin? Show Answer


Q267) Primary growth of plants is contributed by Show Answer


Q268) Growth of the plant is open because of Show Answer


Q269) Senescence as an active developmental cellular process in the growth and functioning of a flowering plant,
is indicated in Show Answer


Q270) Phytohormone commonly called stress hormone is Show Answer


Q271) Which one of the following is not a effect of gibberellin? Show Answer


Q272) Study the following question
I. Who was the first to confirm the release of volatile?
Substance from ripened organs of plants?
II. Who discovered kinetin from herring sperm?
III. Who discovered GA?
Which of the following option correctly answer the given questions? Show Answer


Q273) Which of the following is essential for plant growth? Show Answer


Q274) Choose the correct statement
I. Cytokinin – Delay of leaf senescene
II. Auxin – Apical dominance
III. Ethylene – Seed germination
IV. Gibberellins – Immature falling of leaves Show Answer


Q275) In geometrical growth, log phase is represented by Show Answer


Q276) The pigment involved in photomorphogenetic movement is Show Answer


Q277) Growth in plants is measured by the increase in
I. fresh weight
II. dry weight
III. length, area and volume
IV. cell number
Choose the correct option Show Answer


Q278) To make stored food available for germination, with which hormone seed should be treated? Show Answer


Q279) Most widely used compound as a source of ethylene is Show Answer


Q280) The site of perception of light is Show Answer


Q281) Natural cytokinins are synthesised in which regions of plants? Show Answer


Q282) The rosette habit of cabbage can be changed by application of Show Answer


Q283) Which is used as weedicide? Show Answer


Q284) The living differentiated cells, regain capacity of division under certain condition which called Show Answer


Q285) Photoperiodism was first studied by Show Answer


Q286) A phytohormone, which increases the production of starch hydrolyzing enzymes during the germination
of maize seeds, is employed for the following Show Answer


Q287) Treatment of seed at low temperature under moist conditions to break its dormancy, is called Show Answer


Q288) The Plant Growth Regulator (PGR), ethylene comes under the category of Show Answer


Q289) Plants requiring low light intensity for optimum photosynthesis are called Show Answer


Q290) Large amount of ethylene is synthesised by Show Answer


Q291) In geometrical growth, lag phase is represented by Show Answer


Q292) Natural and synthetic-auxin (IAA, NAA, IBA, 2-4-D) have been used extensively in Show Answer


Q293) Water is required in plant growth for Show Answer


Q294) IAA is derived from or which of the following is involved in the synthesis of a plant IAA and vasoconstrides
cerotonin? Show Answer


Q295) During differentiation, the cells undergo few to major structural changes in their Show Answer


Q296) Study the following statement
I. Cytokinins are formed primarily in roots
II. Auxin and cytokinin are antagonistic in apical dominance
III. Kinetin (a modified DNA purine) was discovered from herring sperm
IV. Zeatin is auxin
V. Zeatin was firstly extracted from herring
Choose the incorrect one Show Answer


Q297) SDP also called Show Answer


Q298) Arithmetic growth is linear because Show Answer


Q299) In S-shaped curve, the growth is highest in which phase? Show Answer


Q300) Canary grass experiment for phototropism was firstly conducted by Show Answer


Q301) Which hormone is called the dormancy hormone? Show Answer


Q302) Plant growth regulators are also described as Show Answer


Q303) Name of a gaseous plant hormone is Show Answer


Q304) Exponential growth can’t be sustained for much time due to
I. limited space and nutrient
II. accumulation of toxic agent
III. unlimited space and nutrient
IV. accumulation of nutrient agent
Choose the correct combination of options Show Answer


Q305) Programmed cell death is scientifically termed as Show Answer


Q306) The following statements are given about plant growth hormones:
I. Kinetin is a degradative substance from DNA molecule.
II. ABA is present, in all the plants.
III. Low ratio of cytokinins to auxins favours root formation only.
IV. ABA is synthesized catabolically through mevalonate pathway.
The correct combination is Show Answer


Q307) Opening of floral buds into flowers, is a type of Show Answer


Q308) The type of growth where new cells are always being added to plant body by the activity of meristem is
called Show Answer


Q309) Which one of the following acids is a derivative of carotenoids? Show Answer


Q310) Growth plotted against time gives a Show Answer


Q311) The final structure at maturity of a cell/tissue is determined by Show Answer


Q312) Charles Darwin and Francis Darwin are related with Show Answer


Q313) Vernalisation can be reversed by Show Answer


Q314) Constantly dividing cells, both at the root apex and shoot apex represents Show Answer


Q315) In most of the higher plants, the growing …A… bud inhibits the growth of …B… bud, a phenomenon called
apical dominance. Removal of the shoot tips usually results in growth of …C… buds.
Complete the given statement with the correct combination of options given in the codes below Show Answer


Q316) How many gibberellins are reported from widely different organism such as plant and fungi? Show Answer


Q317) Abscisic acid is primarily synthesized in Show Answer


Q318) Cytokinins are formed in Show Answer


Q319) Which hormone (PGR) encounters the apical dominance induced by auxin? Show Answer


Q320) Which of the following is an anti-gibberellin? Show Answer


Q321) Which hormone is responsible for apical growth? Show Answer


Q322) Increase in the girth of plant (organ) takes place by Show Answer


Q323) Effect of photoperiod on growth and development of plants especially on flowering is called Show Answer


Q324) Vernalisation was found by Show Answer


Q325) The phytohormone that helps in germination of seed, is Show Answer


Q326) Gibberellic acid induces flowering Show Answer


Q327) Development includes (plants)
I. Differentiation
II. Redifferentiation
III. Dedifferentiation
Select the right combination from the given option Show Answer


Q328) ‘Bakane’ disease is related to (hormone and plant)
Show Answer


Q329) One set of a plant was grown at 12 hours day 12 hours night period cycles and it flowered, while in the
other set night phase was interrupted by flash of light and it did not produce flower. Under which one of
the following categories will you place this plant? Show Answer


Q330) Which of the following hormones does not naturally occur in plants? Show Answer


Q331) The deteriorative processes in plants that naturally terminate their functional life, are collectively called Show Answer


Q332) Abscission and dormancy are caused by Show Answer


Q333) Process of vernalization can be induced by Show Answer


Q334) Growth of an organism is characterised by Show Answer


Q335) The hormone involved in metabolism of food material in cereal grains during germination is Show Answer


Q336) A hormone delaying senescence is Show Answer


Q337) Cytokinin helps in delaying the leaf falling/senescences mainly by Show Answer


Q338) ABA was discovered during Show Answer


Q339) Parthenocarpy in tomatoes is induced by Show Answer


Q340) Growth promoting hormone is Show Answer


Q341) The study of different aspects or appearance of plants in different seasons of the year is called Show Answer


Q342) Flowering of plants by exposure to low temperature is called Show Answer


Q343) Which of the following movement in plants is not related to change in auxin level? Show Answer


Q344) I. Leaf abscission is …A… by auxin in younger leaves and fruits
II. Apical dominance is …B… by auxin
Complete the given statement by choosing appropriate options for the given blanks Show Answer


Q345) Study the following statements of plants growth
I. One single maize root apical meristem can give rise to more than 17500 new cells per hour
II. A cell in watermelon can increase its size up to 3,50,000 times
III. Growth of pollen tube is measured in the terms of its length
IV. Growth in dorsiventral leaf is measured in terms of an increase in its surface area
Choose the correct option Show Answer


Q346) Ethephon Show Answer


Q347) The chemical nature of gibberellins is Show Answer


Q348) Which hormone was first isolated from human urine? Show Answer


Q349) Which of the following is the effect of a plant hormone, which is synthesized more in the absence of light? Show Answer


Q350) Vernalisation helps in Show Answer


Q351) Day neutral plant relates to Show Answer


Q352) Opening of flower is an example of Show Answer


Q353) Which of the following movements is induced by injury? Show Answer


Q354) Substance related with phototropism in shoot, is Show Answer


Q355) Which pigment involves in photoperiodic change in plants? Show Answer


Q356) Initially, the ABA was identified as Show Answer


Q357) Florigen is produced in the region of Show Answer


Q358) I. Cell elongation
II. Cell division
III. Cell differentiation
Among the above mentioned, what is/are the function(s) of auxin? Show Answer


Q359) Closure of lid of picher, in pitcher plant, is Show Answer


Q360) In some plants, sleep movement of leaves is due to Show Answer


Q361) Hormone inducing fruit ripening is Show Answer


Q362) Phase of maturation is characterised by
I. Cells attaining their maximal size
II. Proper wall thickening and protoplasmic modification
III. Rapid cell division
Select the correct option Show Answer


Q363) The following statements are given about plant growth hormones:
I.Cytokinins suppress the synthesis of chlorophyll.
II.Auxins control apical dominance.
III.Gibberellins promote shoot elongation.
IV.Abscisic acid enabling seeds to withstand desiccation.
Which of the above statements are correct? Show Answer


Q364) Growing season is the season of plants in which there is Show Answer


Q365) The problem of necrosis and gradual senescence, while performing tissue culture can be overcome by Show Answer


Q366) Opening and closing of flowers represent a kind of Show Answer


Q367) During differentiation of tracheary elements, Show Answer


Q368) Leaf abscission, fruit fall, and bud dormancy occurs by which phytohormone? Show Answer


Q369) The response of different organisms to environment rhythms of light and darkness, is called Show Answer


Q370) Growth of the plant is Show Answer


Q371) Plant growth Regulators (PGR) or plant hormones are generally Show Answer


Q372) Which of the following functions is/are not the function/s of cytokinin?
I. New leaves formation
II. Chloroplast formation in leaves
III. Lateral shoot formation
IV. Adventitious shoot formation
V. Rooting on stem cuttings
Choose the correct option Show Answer


Q373) Differentiation in plants is open because Show Answer


Q374) Growth of plant is Show Answer


Q375) The cells in the root and shoot apex Show Answer


Q376) Identify two physiological processes induced by two different phytohormones having a common
precursor, which is formed due to the catalytic activity of pyruvic dehydrogenase complex.
I. more female folwers in cucumber. II. a-amylase production in
barley grain. III. Acceleration of fruit ripening in tomato.
IV. Delay in sprouting of potato tubers. the correct combination is Show Answer


Q377) Auxin originates at the tip of the stem and controls growth elsewhere. The movement of auxin is largely Show Answer


Q378) The cells proximal (just next away from the tip) to the meristematic zone represents the phase of Show Answer


Q379) Specific areas in the higher plants which takes part in the formation of new cells are called Show Answer


Q380) Temperature required for vernalisation is Show Answer


Q381) Which of the following pairs, is not correctly matched? Show Answer


Q382) ‘Bakane’ (foolish seedling) disease of rice seedlings, was caused by Show Answer


Q383) 6-furfuryl amino purine, 2-4 dichlorophenoxy acetic acid and indole-3 acetic acid are examples
respectively for Show Answer


Q384) Which of the following is not an influence of auxin? Show Answer


Q385) Importance of day length in flowering of plants was first shown in Show Answer


Q386) Intussusception is Show Answer


Q387) One of the synthetic auxin is Show Answer


Q388) Examples of plants which requires vernalisation is/are Show Answer


Q389) I. More female flowers in cucumber
II. α-amylase production is barley grain
III. Acceleration of fruit ripening in tomato
IV. Delayed in sprouting in potato tubers
From the given effects find, out the effects of ethylene and choose the correct option accordingly Show Answer


Q390) Study the following statements
I. Increase in girth of plants is primary growth
II. Increase in girth of plants occurs due to apical meristem
III. Secondary growth of plants occurs due to lateral meristem
IV. Vascular cambium and cork cambium are the lateral meristem of plants
V. Elongation of a plant along the axis is called primary growth
Choose the incorrect options Show Answer


Q391) Plant growth is unique because Show Answer


Q392) Search for natural cytokinin lead to the Show Answer


Q393) A sleep movement in plants is a nastic response, that occurs daily in response to Show Answer


Q394) Synthetic auxins are used for Show Answer


Q395) How does pruning help in making the hedge dense? Show Answer


Q396) Which one is not an ethylene effect? Show Answer


Q397) Which of the following in incorrectly matched? Show Answer


Q398) Which plant growth regulator is responsible for triple response? Show Answer


Q399) Choose the incorrect pair. Show Answer


Q400) The ripening of fruits can be fastened by treatment with Show Answer


Q401) Prunning of plants promotes branching because the axillary buds get sensitized to Show Answer


Q402) Richmond-Lang effect is concerned with Show Answer


Q403) Which type of tropism is shown by tulip and sunflower respectively? Show Answer


Q404) Gibberellin was first discovered from Show Answer


Q405) Winter varieties of wheat and barley are planted in Show Answer


Q406) With respect to photoperiodism, these are long day plants. Show Answer


Q407) Ethylene is connected with Show Answer


Q408) Chooses the incorrect statement Show Answer


Q409) In the most situation, ABA acts as the Show Answer


Q410) If shoot cuttings are treated with auxin then Show Answer


Q411) Ethylene is used Show Answer


Q412) Growth curve is the Show Answer


Q413) Hormone replacing the requirement of vernalization is Show Answer


Q414) Photoperiod was first observed in Show Answer


Q415) Decapitation (shoot tip removal) is widely used in Show Answer


Q416) Phototropic curvature is the result of uneen Distribution of Show Answer


Q417) Which one of the following statement is incorrect? Show Answer


Q418) Which hormone causes stunted growth in pea? Show Answer


Q419) Leaf abscission is caused by Show Answer


Q420) I. Auxin II. Cytokinin III. GA IV. ABA
Which of the above mentioned PGA are acidic in nature? Choose the correct option accordingly Show Answer


Q421) In plants, phototropism is the movement Show Answer


Q422) Which was discovered first? Show Answer


Q423) Which one is the example of dedifferentiation? Show Answer


Q424) Auxin causes Show Answer


Q425) Apical dominance is caused by Show Answer


Q426) Permanent localised qualitative change in size, biochemistry, structure and function of cells or organs is
called Show Answer


Q427) The maximum growth rate occurs in Show Answer


Q428) The coiling of tendril around some base in response to touch, is called Show Answer


Q429) 'Apical dominance' in plants is the result of Show Answer


Q430) Heterophylly can be observed in
I. cotton
II. coriander
III. larkspur
Select the right option Show Answer


Q431) Heterophylly can be observed in cotton,
coriander, and larkspur Show Answer


Q432) In the exponential phase of geometric growth, the Show Answer


Q433) Surface area of roots by promoting roots growth and root hair formation is increased by Show Answer


Q434) Gibberellins promotes cell division and elongation in Show Answer


Q435) I. Indole-3-acetic acid
II. 2-4, dichlorophenoxy acetic acid
III. 6 Indole butyric acid
IV. Naphthalene acetic acid
Above are the examples of which PGR? Show Answer


Q436) Sprouting of potato under storage condition can be prevented by Show Answer


Q437) The hormone present in the liquid endosperm of coconut is Show Answer


Q438) After a series of experiments, it was concluded that the …A… of coleoptile was the site of transmittable
influence that caused the …B… of the entire coleoptile.
Complete the given statement with the correct combination of options given in the codes below Show Answer


Q439) Bolting may be induced by Show Answer


Q440) Plant hormones are Show Answer


Q441) Which one of the following pairs is not correctly matched? Show Answer


Q442) I. Initiate rooting in stem cuttings
II. Promote flowering in pineapples
III. Controls xylem differentiation
Identify the functions of auxin and choose the correct option Show Answer


Q443) Short day plant is Show Answer


Q444) Beta vulgaris is a Show Answer


Q445) The natural plant hormone isolated from corn kernels and coconut milk is Show Answer


Q446) Name the process when dedifferentiated cells again loss the ability to divide and get mature? Show Answer


Q447) The flowers of Oxalis open during the day and close at night , such type of movement is Show Answer


Q448) Measurement and comparison of total growth in geometrical growth of a plant per unit time is called Show Answer


Q449) Identify the pair of physiological effects of two phytohormones, which are synthesized from different
amino acids?
I. Formation of perennating buds in Lemna.
II. Simultaneous flowering in pineapple.
III. Bolting in cabbage.
IV. Apical dominance in Polyalthia. Show Answer


Q450) The movement of hairs in Drosera is Show Answer


Q451) Nicotiana sylvestris flowers only during long days while N. tobacum flowers only during short days. If
raised in the laboratory under different photoperiods, they can be induced to flower at the same time and
can be cross fertilized to produce self-fertile offspring.
What is the best reason for considering N.sylvestries and N.tobacum to be separate species? Show Answer


Q452) Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves. Show Answer


Q453) Haptonastic movement is found in Show Answer


Q454) Which one is an example of redifferentiation? Show Answer


Q455) Plants follow …A… pathways in response to environment or phases of life to form different kind of
structures. This ability is called …B…
Complete the given statement with the correct combination of options Show Answer


Q456) The bioassay of auxin is Show Answer


Q457) The cells derived from cambium, root apical and shoot apical meristem differentiate and mature to
perform specific functions. This act is called Show Answer


Q458) Induction of flowering by low temperature treatment is Show Answer


Q459) Response of plants due to reversible turgor change in pulvinus is Show Answer


Q460) Which of the following is a day neutral plant? Show Answer


Q461) Cell elongation in intermodal regions of the green plants takes place due to Show Answer


Q462) An enzyme that can stimulate germination of barley seeds is Show Answer


Q463) Vernalization is done at Show Answer


Q464) The role of PGR is of one kind of …A… control. Along with genomic control and …B… factors, they play an
important role in plant growth. Many of …C… factor, such as temperature, light, etc., control growth and development via PGR
Choose the correct option A, B and C to complete the given statement Show Answer


Q465) The phytohormone, which induces triple response growth is Show Answer


Q466) Which phytohormone has viral inhibitory property? Show Answer


Q467) Shock movement in 'touch me not' plant is Show Answer


Q468) Efficiency index in the exponential phase of geometrical growth is the ability of plants to produce Show Answer


Q469) The discovery of gibberellins is related with one of the following Show Answer


Q470) The ability of plants to follow different pathway to form different structures in response to environment is
called Show Answer


Q471) An example of short day plant is Show Answer


Q472) The plant hormone produced by Rhizobium for nodulation is Show Answer


Q473) Stimulus of vernalisation is perceived by Show Answer


Q474) When transition from juvenile to adult is gradual than this type of development is called Show Answer


Q475) which of the PGR6 induces parthenocarpy in tomatoes? Show Answer


Q476) Which of the following is/are example/s of long day plant?
I. Tomato
II. Maize
III. Rice
IV. Radish
Choose the correct option accordingly Show Answer


Q477) Which one is short day plant? Show Answer


Q478) Which of the following flowers shows nyctinastic movement? Show Answer


Q479) In photoactive plants, during day time the following ionic flux of guard cell is directly involves the
expenditure of energy. Show Answer


Q480) I. Lag phase → Log phase → Stationary phase
II. Geometric and Arithmetic phase of growth
III. Growth shown by all living organism in vivo
IV. Lt = L0 + rt
Match the above characters with sigmoid curve, arithmetic growth, embryo development and choose the
correct option accordingly
Sigmoid curve Arithmetic Embryo
growth development Show Answer


Q481) I. Lag phase
II. Stationary phase
III. Exponential phase
Arrange the above steps of geometrical growth (from beginning to last) in a correct sequence of their
occurrence and choose the correct option accordingly Show Answer


Q482) What helps in flowering? Show Answer


Q483) The terms auxin is applied to
I. IAA II. IBA
III. NAA IV. 2-4-D
Select the correct option Show Answer


Q484) I. Plasmatic growth
II. Differentiation
III. Maturation
IV. Senescence
Identify the correct sequence of the following events occurring in plants and choose the correct option
accordingly Show Answer


Q485) S-shaped or sigmoid growth curve have
I. lag phase
II. log phase
III. stationary phase
IV. diminishing growth phase
Select the correct option Show Answer


Q486) Identify the correct option for A and B
Compound Function
2,4-D A
B Fruit ripening
A B Show Answer


Q487) Quantitative comparison between the growth of living system can be made in Show Answer


Q488) In the expression,W1=W0 e rt (geometrical growth), W1, W0, r, t represents W0 W1 r t Show Answer


Q489) Mobilization of stored food in germinating seed is triggered by Show Answer


Q490) Removal of shoot tip increases apical dominance
Due to accumulation of auxin in lateral parts, growth is inhibited Show Answer


Q491) A farmer does not prefer to grow tobacco plant under long day conditions.
Tobacco is a short day plant. Show Answer


Q492) Photomodulation of flowering is a phytochrome
Active form of phytochrome (Pfr ) directly induces floral induction in shoot buds Show Answer


Q493) Ethylene stimulates growth in case of wounds and thus helps in wound healing.
Ethylene causes triple response growth in plants. Show Answer


Q494) Compare the statement A with B
Statement A Auxins promote apical dominance by suppressing the activity of lateral
buds.
Statement B In horticulture, periodic pruning of shoot tips is done to make mulberry
plants bushy Show Answer


Q495) Decapitation of shoot tip in plants inhibits the growth of their lateral buds.
Accumulation of auxins in lateral buds causes inhibition of their growth. Show Answer