Practice Test


1) Growth is defined as


2) In unicellular organism growth is shown by


3) In living organisms, growth is


4) During germination due to water, ________ enzymes become active.


5) In hypogeal germination


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


7) Hypogeal germination is found in


8) Hypogeal germination is seen in


9) During epigeal germination of seed


10) Vivipary is the characteristic feature of


11) Vivipary germination is observed in


12) Vivipary is the germination


13) Epigeal germination is found in


14) On the basis of the type of seed germination identify the ODD one.


15) In hypogeal germination, the cotyledons of seed never become photosynthetic as they


16) Germination takes place when the


17) First visible sign of germination is


18) Oxygen is essential for seed germination because


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


20) Plant growth is


21) Changes due to growth is


22) Meristematic cells have the capacity


23) The meristem which is present from embryonic condition is called


24) Development in organisms involves


25) Growth is maximum in the zone of


26) In a growing plant, the very first phase during the process of growth is


27) Formation phase is


28) In lag phase, growth is


29) In plants, growth plotted against time gives a


30) Maximum rate of growth occurs in


31) Growing plants in dark that causes bending and reduction in size is


32) In root,the region of fastest growth is


33) The term 'Grand period of growth' was given by


34) The growth of a plant in log phase is


35) The phenomenon of growth is immediately followed by


36) Growth period of plant between seed germination to flower formation is called


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


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


39) Highest auxin concentration occurs


40) Among the following synthetic auxin is


41) Apical dominance is caused by which of the following hormones ?


42) Which of the following plant functions is not controlled by auxins ?


43) Growth hormone responsible for apical dominance is


44) I.A.A. stands for


45) Which of the following effects of auxins on plants is used for commercial application ?


46) Avena curvature test was done by


47) Which of the following is used as a weedicide ?


48) Naturally occurring auxin is


49) Substances formed at the stem tip and controlling growth elsewhere are


50) Auxin suppresses the growth of


51) Higher concentration of some synthetic auxins is used for


52) Movement of auxin is


53) Auxin synthesis occurs in


54) Highest auxin concentration occurs


55) Auxin takes part primarily in


56) What is false about auxin ?


57) Natural auxins are synthesized from


58) Abscission layer is formed when the concentration of


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


60) Auxin which is highly efficient in the induction of roots on stem cutting in the


61) Commercial use of auxin is


62) 2, 4-D causes


63) Removal of apical bud result in the


64) Fruit drop is prevented by spraying


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


66) Which of the following is used in root formation on stem cuttings ?


67) Growth curve in plant is


68) Apical dominance is


69) Apical dominance includes the


70) Auxins differ from other regulating compunds in plants because auxins


71) Which of the following stimulates cell division ?


72) Some early experiments on phototropic curvature in glasses led to the discovery of


73) An important finding in Went's experiment was


74) Parthenocarpy can be achieved by


75) Avena coleoptile auxin is


76) Prunning of plants promotes branching due to sensitization of axillary buds by


77) What is the role of auxin ?


78) Apical dominance is caused by


79) More auxins than cytokinins initiates


80) Which of the following hormone is concerned chiefly with root initiation ?


81) For rooting on stem cuttings or on leaves of Bryophyllum the growth regulator used is


82) Apical dominance in higher plants is due to


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


84) Internodal elongation is stimulated by


85) Bakanae disease of rice is due to


86) Which of the following physiological effects is caused in plants by gibberellic acid ?


87) Gibberellin was first extracted from


88) Gibberella fujikuroi is a/an


89) Gibberellin was first discovered by


90) Gibberellic acid induces flowering in


91) Gibberellins induce


92) Dwarfness can be controlled by treating the plant with


93) Gibberellins bring about


94) Gibberellins promote


95) Size of grapes are increased by the application of


96) Gibberrellic acid includes flowering


97) Mobilization of stored food in germinating seeds is triggered by


98) Seed dormancy can be broken by the spray of


99) Cut or excised leaves remain green for long, if dipped in


100) Cytokinin


101) 'Richmond Lang effect' refers to the


102) The Richmond-Lang effect pertains to


103) For plant tissue culture, which among the following is required ?


104) The hormone produced during adverse environmental condition is


105) Senescence is the


106) What is true about ethylene ?


107) Out of following which one is known as a secondary hormone ?


108) The effect of ethylene is inhibited due to


109) Which of the following acts as the precursor for the biosynthesis of ethylene in plants ?


110) Ethylene is


111) Which one produces more ethylene ?


112) Hormone capable of replacing the requirement of long photoperiods for flowering is


113) Fruit ripening is accelerated by


114) Growth of lateral branches is promoted by


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


116) The chemical nature of kinetin is


117) Abscissic acid (ABA) promotes


118) Balanced combination of cytokinin and auxin helps in


119) Hormone discovered through tissue culture technique is


120) Hormone primarily related to cell division is


121) Apical dominance is due to


122) Which hormone is called stress hormone ?


123) Artificial ripening of fruits is accomplished by


124) Ethylene gas


125) Development of shoot and root is determined by


126) The regulator which delays the onset of senescence in plant is


127) First natural cytokinin was discovered by


128) Hormone that promotes growth of lateral buds has negative effect on apical dominance is


129) Richmond-Lang effect is due to


130) The name 'zeatin' was coined by


131) Which of the following is a cytokinin ?


132) Hormone found in liquid endosperm of coconut is


133) A plant hormone that induces morphogenesis in plant tissue culture is


134) Bioassay of IAA is


135) Induction of cell division and delay in senescene are due to


136) Cytokinins


137) Flowering of Chrysanthemum is inhibited by


138) Abscissic acid, the stress related hormone, also


139) Stress hormone produced during adverse environmental condition is


140) Abscissic acid controls


141) Which of the following induces flowering in short-day plants ?


142) During drought, plants develop hormone


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


144) Abscissic acid causes


145) The hormone which promotes flowering in long day conditions and controls sex expression is


146) Seedless tomatoes are produced by


147) In autumn, leaf fall occurs because


148) Stomatal closure under stress condition is due to


149) Abscissic acid causes


150) A plant hormone used for inducing morphogenesis in plant tissue culture is


151) What will happen if apical bud is removed in a flowering plant ?


152) Hormone responsible for senescence is


153) The length of the plant can be increased by


154) Agening of plants is related to which of the following hormone ?


155) Deterioration process in plants, that naturally terminates their functional life is called


156) Abscission layer is formed when the concentration of


157) Flowering in pineapple can be induced by the application of


158) In horticulture, an important root inducing chemical is


159) Physiological function not influenced by ABA is


160) High auxin and low cytokinin concentration produce


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


162) Identify the precursor substance among the following used in the biosynthesis of gibberellins in plants.


163) Genetically, dwarf pea plant can become phenotypically tall if treated with


164) Inhibition of seed germination can be done by


165) Hormone responsible for plant and seed dormancy during drought is


166) Growth movements in response to light and dark period are called


167) In general the length (duration) in hours of a critical photoperiod is comparatively


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


169) Which one is not affected by light ?


170) In many plants the change from vegetative to reproductive phase takes place in response to


171) Which event does not take place in short day plants ?


172) In short day plants, flowering is induced by


173) Effect of the day length duration on plant development and flowering is


174) A long day plant is


175) Environmental rhythms of light and darkness produce


176) A chemical believed to be involved in flowering is


177) Florigen is synthesized in


178) Flowering is influenced by


179) Photoperiodic stimulus is perceived by


180) Photoperiodism is probably due to the synthesis of


181) Pigment taking part in photo-perception of flowering is


182) Garner and Allard are connected with


183) The response of different organisms to environmental rhythms of light and darkness is called


184) Photoperiodism was discovered in a variety of ____ plant.


185) Synthesis and action site of florigen is


186) Which is plant SDP ?


187) Which plant is LDP ?


188) Photoperiodism was first characterised in


189) Photoperiodic induction can be produced


190) Which of the following is a long day plant ?


191) Which of the following hormones can replace vernalization ?


192) Winter variety of Petkus rye can flower


193) Vernalization is


194) Find the ODD one out.


195) Suitable temperature range for vernalization is


196) The reversal effect of vernalization is called


197) Which hormone is produced due to vernalization


198) By which process can biennials can be converted to annuals ?


199) Which is a devernalization factor ?


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


201) Germination seen in groundnut is


202) Growth in numbers is maximum in the zone of


203) Choose the correct sequence of stages of growth curve in bacteria.


204) The sigmoid curve has the shape of English letter


205) Dwarfness of plant is controlled by treating it with


206) Which of the following is a natural growth inhibitor ?


207) In unisexual plants, sex can be changed by the application of


208) Plant material used in tissue culture is


209) Exogenous GA induces the formation of male flowers on genetically female plants of


210) Who amongst the following is a discoverer of auxin ?


211) Abscission is characterized by


212) Which hormone can induce flowering in long day plants ?


213) Plant growth hormones extracted from a fungus and a fish are respectively


214) 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


215) Common inhibitor of germination is


216) Which is not a natural plant hormone ?


217) Which one prevents premature fall of fruit ?


218) Hormone produced during leaf fall is


219) Identify the ODD one from the following .


220) Which of the following is an antigibberellin ?


221) Bioassay of auxins is


222) Chrysanthemum flowers in winter because


223) Which is short day plant ?


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


225) 'Vernalization' term was coined by


226) Total time required for the completion of three phases of growth is called


227) The rate of growth gradually slows down during


228) Went isolated auxin from


229) Rapid and dramatic increase in shoot length is called


230) Environment heterophylly is seen in


231) Genetically dwarf plants can be induced to grow tall by using


232) Increased growth per unit time is termed as


233) Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?


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


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


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


237) Cytokinins are mostly


238) Geotropic response is perceived by


239) Natural cytokinins are synthesized in tissue that are


240) Which of the following processes is concerned with Cholodny-Went theory?


241) Growth at cellular level is the increase in the amount of


242) Which one of the following is a natural growth inhibitor?


243) 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


244) Thigmotropism is best seen in


245) In coleoptile tissue, auxin is


246) Which of the following induces flowering in long day plants?


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


248) For cryopreservation, plant materials are frozen at


249) Maximum elongation takes place in


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


251) Micropropagation is done by


252) Auxanometer is used to mesure


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


254) Photoperiodism was first characterized in


255) Hydroponics is a system of growing plants in


256) 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


257) The stress hormone that helps plant to respond drought is


258) Auxins promote


259) Respiratory climacteric is related with


260) 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


261) Coiling of garden pea tendrils around any support is an example of


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


263) Member of auxin, which is widely used to kill the dicotyledonous weed is


264) 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


265) Growth period of plant is generally divided into


266) Difference between kinetin and zeatin is


267) Auxanometer is used to detect


268) Auxin was isolated by


269) The most common auxin is


270) Which plant hormone is found in gaseous form?


271) Auxin in plant means for


272) Grand place of growth is an another name of


273) Which of the following movements in plants is due to the increased concentration of auxin?


274) Primary growth of plants is contributed by


275) Growth of the plant is open because of


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


277) Phytohormone commonly called stress hormone is


278) Which one of the following is not a effect of gibberellin?


279) 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?


280) Which of the following is essential for plant growth?


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


282) In geometrical growth, log phase is represented by


283) The pigment involved in photomorphogenetic movement is


284) 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


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


286) Most widely used compound as a source of ethylene is


287) The site of perception of light is


288) Natural cytokinins are synthesised in which regions of plants?


289) The rosette habit of cabbage can be changed by application of


290) Which is used as weedicide?


291) The living differentiated cells, regain capacity of division under certain condition which called


292) Photoperiodism was first studied by


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


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


295) The Plant Growth Regulator (PGR), ethylene comes under the category of


296) Plants requiring low light intensity for optimum photosynthesis are called


297) Large amount of ethylene is synthesised by


298) In geometrical growth, lag phase is represented by


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


300) Water is required in plant growth for


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


302) During differentiation, the cells undergo few to major structural changes in their


303) 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


304) SDP also called


305) Arithmetic growth is linear because


306) In S-shaped curve, the growth is highest in which phase?


307) Canary grass experiment for phototropism was firstly conducted by


308) Which hormone is called the dormancy hormone?


309) Plant growth regulators are also described as


310) Name of a gaseous plant hormone is


311) 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


312) Programmed cell death is scientifically termed as


313) 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


314) Opening of floral buds into flowers, is a type of


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


316) Which one of the following acids is a derivative of carotenoids?


317) Growth plotted against time gives a


318) The final structure at maturity of a cell/tissue is determined by


319) Charles Darwin and Francis Darwin are related with


320) Vernalisation can be reversed by


321) Constantly dividing cells, both at the root apex and shoot apex represents


322) 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


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


324) Abscisic acid is primarily synthesized in


325) Cytokinins are formed in


326) Which hormone (PGR) encounters the apical dominance induced by auxin?


327) Which of the following is an anti-gibberellin?


328) Which hormone is responsible for apical growth?


329) Increase in the girth of plant (organ) takes place by


330) Effect of photoperiod on growth and development of plants especially on flowering is called


331) Vernalisation was found by


332) The phytohormone that helps in germination of seed, is


333) Gibberellic acid induces flowering


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


335) ‘Bakane’ disease is related to (hormone and plant)


336) 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?


337) Which of the following hormones does not naturally occur in plants?


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


339) Abscission and dormancy are caused by


340) Process of vernalization can be induced by


341) Growth of an organism is characterised by


342) The hormone involved in metabolism of food material in cereal grains during germination is


343) A hormone delaying senescence is


344) Cytokinin helps in delaying the leaf falling/senescences mainly by


345) ABA was discovered during


346) Parthenocarpy in tomatoes is induced by


347) Growth promoting hormone is


348) The study of different aspects or appearance of plants in different seasons of the year is called


349) Flowering of plants by exposure to low temperature is called


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


351) 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


352) 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


353) Ethephon


354) The chemical nature of gibberellins is


355) Which hormone was first isolated from human urine?


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


357) Vernalisation helps in


358) Day neutral plant relates to


359) Opening of flower is an example of


360) Which of the following movements is induced by injury?


361) Substance related with phototropism in shoot, is


362) Which pigment involves in photoperiodic change in plants?


363) Initially, the ABA was identified as


364) Florigen is produced in the region of


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


366) Closure of lid of picher, in pitcher plant, is


367) In some plants, sleep movement of leaves is due to


368) Hormone inducing fruit ripening is


369) 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


370) 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?


371) Growing season is the season of plants in which there is


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


373) Opening and closing of flowers represent a kind of


374) During differentiation of tracheary elements,


375) Leaf abscission, fruit fall, and bud dormancy occurs by which phytohormone?


376) The response of different organisms to environment rhythms of light and darkness, is called


377) Growth of the plant is


378) Plant growth Regulators (PGR) or plant hormones are generally


379) 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


380) Differentiation in plants is open because


381) Growth of plant is


382) The cells in the root and shoot apex


383) 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


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


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


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


387) Temperature required for vernalisation is


388) Which of the following pairs, is not correctly matched?


389) ‘Bakane’ (foolish seedling) disease of rice seedlings, was caused by


390) 6-furfuryl amino purine, 2-4 dichlorophenoxy acetic acid and indole-3 acetic acid are examples
respectively for


391) Which of the following is not an influence of auxin?


392) Importance of day length in flowering of plants was first shown in


393) Intussusception is


394) One of the synthetic auxin is


395) Examples of plants which requires vernalisation is/are


396) 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


397) 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


398) Plant growth is unique because


399) I. Kinetin is a degradative substance from DNA
II. ABA is present in all plants including lower plants
III. Low ratio of cytokinin to auxin favours root formation only
IV. ABA is synthesised catabolically through glycolysis pathway
Choose the correct combination of options


400) Search for natural cytokinin lead to the


401) A sleep movement in plants is a nastic response, that occurs daily in response to


402) Synthetic auxins are used for


403) How does pruning help in making the hedge dense?


404) Which one is not an ethylene effect?


405) Which of the following in incorrectly matched?


406) Which plant growth regulator is responsible for triple response?


407) Choose the incorrect pair.


408) The ripening of fruits can be fastened by treatment with


409) Prunning of plants promotes branching because the axillary buds get sensitized to


410) Richmond-Lang effect is concerned with


411) Which type of tropism is shown by tulip and sunflower respectively?


412) Gibberellin was first discovered from


413) Winter varieties of wheat and barley are planted in


414) With respect to photoperiodism, these are long day plants.


415) Ethylene is connected with


416) Chooses the incorrect statement


417) In the most situation, ABA acts as the


418) If shoot cuttings are treated with auxin then


419) Ethylene is used


420) Growth curve is the


421) Hormone replacing the requirement of vernalization is


422) Photoperiod was first observed in


423) Decapitation (shoot tip removal) is widely used in


424) Phototropic curvature is the result of uneen Distribution of


425) Which one of the following statement is incorrect?


426) Which hormone causes stunted growth in pea?


427) Leaf abscission is caused by


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


429) In plants, phototropism is the movement


430) Which was discovered first?


431) Which one is the example of dedifferentiation?


432) Auxin causes


433) Apical dominance is caused by


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


435) The maximum growth rate occurs in


436) The coiling of tendril around some base in response to touch, is called


437) 'Apical dominance' in plants is the result of


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


439) Heterophylly can be observed in cotton,
coriander, and larkspur


440) In the exponential phase of geometric growth, the


441) Surface area of roots by promoting roots growth and root hair formation is increased by


442) Gibberellins promotes cell division and elongation in


443) 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?


444) Sprouting of potato under storage condition can be prevented by


445) The hormone present in the liquid endosperm of coconut is


446) 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


447) Bolting may be induced by


448) Plant hormones are


449) Which one of the following pairs is not correctly matched?


450) 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


451) Short day plant is


452) Beta vulgaris is a


453) The natural plant hormone isolated from corn kernels and coconut milk is


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


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


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


457) 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.


458) The movement of hairs in Drosera is


459) 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?


460) 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.


461) Haptonastic movement is found in


462) Which one is an example of redifferentiation?


463) 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


464) The bioassay of auxin is


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


466) Induction of flowering by low temperature treatment is


467) Response of plants due to reversible turgor change in pulvinus is


468) Which of the following is a day neutral plant?


469) Cell elongation in intermodal regions of the green plants takes place due to


470) An enzyme that can stimulate germination of barley seeds is


471) Vernalization is done at


472) 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


473) The phytohormone, which induces triple response growth is


474) Which phytohormone has viral inhibitory property?


475) Shock movement in 'touch me not' plant is


476) Efficiency index in the exponential phase of geometrical growth is the ability of plants to produce


477) The discovery of gibberellins is related with one of the following


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


479) An example of short day plant is


480) The plant hormone produced by Rhizobium for nodulation is


481) Stimulus of vernalisation is perceived by


482) When transition from juvenile to adult is gradual than this type of development is called


483) which of the PGR6 induces parthenocarpy in tomatoes?


484) 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


485) Which one is short day plant?


486) Which of the following flowers shows nyctinastic movement?


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


488) 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


489) 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


490) What helps in flowering?


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


492) 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


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


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


495) Quantitative comparison between the growth of living system can be made in


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


497) Mobilization of stored food in germinating seed is triggered by


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


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


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


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


502) 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


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