Practice Test


1) Iron is mainly absorbed in


2) Micronutrients are those elements


3) Which of the following micronutrients can be absorbed by foliage?


4) Which of the following elements are not absorbed from soil?


5) Which of the following is a component of chlorophyll?


6) One of the ways in which the nitrogen of atmosphere is converted into nitrate for plants is by the action of


7) The most abundant element in plant is


8) Minerals of soil are derived from


9) Trace elements are


10) Pre-mature leaf-fall is caused due to deficiency of


11) The chlorophyll is not formed without


12) Micronutrients


13) Woodward (1669) observed that plants grow better in muddy water than in rain water because


14) Who gave the criteria of essentiality?


15) Which one of the following elements is essential for photolysis of water?


16) Which one of the following plants cannot fix atmospheric nitrogen directly?


17) In nitrogen cycle, nitrite is converted to nitrate by


18) Plants absorb mineral salts from the soil solution through


19) Deficiency of iron causes


20) Chlorosis occurs when plants are grown in


21) Which of the following elements is involved in nitrogen metabolism in reduction of nitrates?


22) The mineral constituent of the cell wall is


23) Active uptake of minerals by roots mainly depends on the


24) White bud in maize indicates acute deficiency of


25) Which of the following would not make minerals more available to plants?


26) Synthesis of IAA requires


27) Which of the following is common to ferredoxin and cytochrome?


28) The soluble resources of phosphorus and nitrogen in soil generally get depleted becaues they are usually found as


29) Most of the minerals as inorganic form are transported through


30) Mass flow hypothesis explains transport of


31) Which of the following does not required carrier molecules during transport through cell membranes?


32) In a citrus plantation, all the plants were found to be suffering from the die-back disease and spraying of fungicides was of no help. This problem was due to the deficiency of


33) Which of the following is most limiting factor for nitrification in the soil?


34) Active transport of molecules from outside to inside across a membrane requires


35) If chlorophyll is burnt, what will be left?


36) Deficiency of molybdenum causes


37) Which one of the following element plays an important role in biological nitrogen fixation?


38) Photolysis of water is increased by


39) Which of the following adaptations would not be seen in carnivorous plants?


40) Which of the following essential mineral elements is not a constituent of any enzyme, but stimulates the reactions of many enzymes?


41) Chlorosis, etiolation and albinism are caused by deficiency of


42) Ammonium sulphate is a


43) For normal growth of plants one of the following is not required


44) Nitrogen from the atmosphere is obtained by plants in the form of


45) Pre-mature leaf-fall is caused due to deficiency of


46) Which one of the following can fix atmospheric nitrogen directly?


47) Mg and Fe are required by the plants for the


48) The non-essential element in plant is


49) An example of anaerobic nitrogen fixing saprophytic bacterium is


50) Organisms which fix free nitrogen in soil are


51) Nodules with nitrogen fixing bacteria are present in roots of


52) Members of bean family are particulary important for rotation of crop


53) Nitrogen is an essential component of


54) Mineral matter in soil is due to


55) Which is a micronutrient?


56) Minerals are absorbed by roots through mainly by


57) Which of the following elements can plant take directly from air?


58) Chlorosis in plants occurs due to


59) Hydroponics is


60) Non-essential element for proper growth of plant is


61) Nitrogen is usually absorbed by the plant in the form of


62) Insectivorous plants can grow well in a soil deficient in


63) Without essential mineral nutrients leaves of many plants turn yellow because of


64) Which element is essential as electron carrier?


65) Hydroponics is also called as


66) In the nodules of roots in leguminous plants, we find


67) Which of the following is obligate stem parasite?


68) Which of the following is a partial root parasite?


69) Pick up the saprophytic angiosperm


70) Helotism is master and slave relationship found in


71) Insectivorous plant, Nepenthes is also known as


72) The traps of carnivorous plants contain


73) Which of the following formulae describes nitrogen fixation?


74) Mineral uptake by a terrestrial plant is limited by insufficient


75) Plants that have mutualistic relations with nitrogen fixing bacteria provide the bacteria with


76) The nodule in a palnt root where nitrogen-fixing bacteria live forms from cells of the


77) Plants, such as clover and beans, that have nitrogen-fixing bacteria in their roots are in which of the following families?


78) Contact exchange of ions occurs


79) Bacteria that fix nitrogen for such plants as clover and beans are in which of the following genera?


80) Salt repiration is


81) Which of the following plants will enrich the soil with nitrogen?


82) Organisms that fix nitrogen in aquatic habitats are


83) 'Grey-Speck' disease is caused by the deficiency of


84) The need of individual plants for any particular element is normally defined in terms of


85) Available form of nitrogen to plants is


86) Black necrosis of stem and root tip is caused by the deficiency of


87) Nitrogen fixation by organisms requires conditions that are


88) White bud in Maize indicates acute deficiency of


89) Molybdenum is involved in


90) Nitrogen fixation by bacteria requires the enzyme


91) The conversion of ammonia to ammonium occurs


92) Plants that have mutualistic relations with nitrogen fixing bacteria receive from the bacteria


93) An association between a fungus and a root of higher plant is termed as mycorrhiza which is an example of


94) Which of the following groups of plants can grow in nitrogen deficient soils?


95) Which one of the following is an obligate stem parasite?


96) Nodulation of legumes is reduced in deficiency of


97) A protoplasmic element is


98) A balancing element is


99) The soluble resources of phosphorus and nitrogen in soil generally get depleted because they are usually found as


100) At times of heavy rain, minerals in upper layers of the soil are moved downward by a process known as


101) Bidirectional translocation of minerals takes place through


102) The movement of mineral ions into plant root cells as a result of diffusion is called


103) Function of Mg and Fe is


104) Which of the following is macronutrient?


105) Which of the folloiwng is trace element?


106) The brown colour of leaves of cabbage is due to the deficiency of


107) In fruit trees a disease exanthema is caused by the deficiency of


108) The role of inorganic nutrients in plant growth was at first indicated by


109) The essential nutrient element required by plants in the least quantity is


110) The essential element for the synthesis of auxin is


111) The most important element associated with protoplasm and proteinaceous material of plant is


112) Enzyme catalyzed reactions can be inhibited by


113) Permeability of protoplasm is accelerated by


114) Which of the following is not caused by deficiency of mineral nutrition?


115) Which of the following is not essential for plant growth?


116) Which of the folloiwng nutrient elements is most important for protein synthesis?


117) Which of the folloiwng is not major element?


118) Zinc is essential for


119) Presence of phosphorus


120) Ash is of what significance in the study of mineral nutrition of plants?


121) The presence of an element in plant ash


122) In plants a common symptom caused by deficiencies of P, K, Ca and Mg is


123) That the energy of metabolism is used in uptake of ions is demonstrated by


124) Ion uptake is called active because


125) Active transport of molecules from outside to inside across a membrane requires


126) The efflux of ions from the cell is enhanced by


127) Micronutrient absorbed by foliage is


128) Nitrogen absorbed by plants is


129) Sand culture is a component of


130) Inorganic nutrients are present in the soil as


131) Clay and organic matter of the soil have negative charges. They attract positively charged ions like


132) Which of the followng is required by plants for the formation of ATP?


133) Magnesium is important component of


134) Plants use Zinc as


135) Plants growing in urea sprayed but Mg deficient soil will show


136) ATP molecules combine with carrier molecules and allow passage of substances


137) Enzyme first used for nitrogen fixation


138) This is an insectivorous plant


139) Which of the following is non-symbiotic?


140) Trace element in plants is


141) Which of the following element is essential for nitrogoen metabolism in plants?


142) Plants absorb nitrogen in the form of


143) Which element is located at the center of the porphyrin ring in chlorophyll?


144) The major role of minor elements inside living organisms is to act as


145) Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone


146) The most abundant element found in plants in


147) Yellowish edges appear in leaves deficient in


148) Microelements function as


149) Element required for biological nitrogen fixation is


150) Copper is activator in enzyme


151) If by radiations all the nitrogenase enzymes are inactivated, then there will be no


152) The ability of the Venus Flytrap to capture insects is due to


153) All of the following statements concerning the actionmycetous filamentous soil bacterium Frankia are correct EXCEPT that Frankia


154) If there is deficiency of micronutrients that not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport


155) Prolonged liberal irrigation of agricultural fields is likely to create the problem of


156) The deficiencies of micronutrients, not only affect growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below which group of three elements shall affect most both photosynthetic and mitochondrial electron trasport?


157) Which is essential for root hair growth?


158) Sulphur is an important nutrients for optimum growth and productivity in


159) The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to


160) A plant required magnesium for


161) Which one of the following elements is not an essential micro-nutrient for plant growth?


162) Which one of the following elements in plants is not remobilized?


163) Nitrifying bacteria


164) The function of leghaemoglobin in the root nodules of legumes is


165) Plants absorb large number of minerals from the soil. Out of over 105 elements discovered, so far, how many are essential for plant growth and metabolism?


166) Macronutrients must generally be present in plant tissue in concentration of


167) Which of the following is a set micronutrients for plants required in small amount of about 0.1 mg per gm of dry matter?


168) Which of the following statements is incorrect?


169) Nitrogen is required by plants in greatest amount. It is one of the major constituents of proteins, nucleic acids, vitamins and hormones. It is absorbed as


170) Deficiency of phosphorus in plants causes


171) Movement of ions from soil to plants require energy and is termed


172) The ion channels are


173) Mineral nutrients absorbed by root are carried to xylem by which pathway?


174) Mineral salts are translocated through xylem in the plants was proved by


175) Nitrites into nitrates conversion is done by


176) The approximate percentage of nitrogen fixed biologically is


177) The Rhizobia are


178) The nitrate reduction and nitrite reduction occurs respectively in


179) Calcium is essential for maintaining permeability of cell membrane but which one if called balancing element?


180) The main respons of boron deficiency is visible in


181) Enzyme nitrogenase is responsible for


182) Nitrifying bacteria


183) Plants growing near the nuclear test sites take up and accumulate which of the following elements?


184) Name the minerals responsible for maintaining cation-anion balance in the plant cells


185) What is the major function of air stone?


186) In hydroponic vegetables, the pH preferred by most vegetable is slightly


187) Which of the following are considered as the roles of iron (Fe) in plants?
I. Important constituent of cytochrome
II. Activator of catalase
III. Essential for chlorophyll synthesis
Choose the correct option


188) By applying which of the following practices, contamination of hydroponics plants can be reduced?


189) An essential element is that which


190) Essential elements perform many functions which includes
I. Permeability of the cell membrane
II. Maintenance of osmotic concentration of the cell sap
III. Major constituents of macromolecules and coenzymes
IV. Buffering action
Choose the correct option


191) Which of the following metals causes harmful effects?


192) Nitrogen is mainly absorbed in the form of


193) In the initial phase of minerals absorption ions are taken up


194) Which of the following is true regarding manganese toxicity in plants?


195) Sulphur is found as a constituent in which of the following amino acids?


196) What is the key principle of the EBB and flow system in hydroponics?


197) Hydroponics has been successfully employed as a technique for which of the following vegetables?


198) For the uptake of ions in the second phase of absorption of minerals, the pathway followed is called


199) How many essential mineral elements have been discovered yet?


200) Which of the following is a rootless aquatic plant in which a portion of the leaf forms a tiny sac for
trapping insects?


201) Which of the given options are correct for hydroponics? Select the correct pair
I. Hydroponics technique is useful in areas having infertile and dry soils
II. Hydroponics can regulate pH optimum for a particular crop
III. It increases the labour cost
IV. It increases the problem of weeding


202) Insectivorous plants eats the insect for


203) Aeroponics are


204) Insectivorous plants eats insects for their requirement of


205) Molybdenum is the essential constituent of


206) Select the correct statement.


207) Which among the following are used as media for hydroponics?


208) The core metal of chlorophyll is


209) Identify the elements which functions as the components of biomolecules
I. Hydrogen II. Magnesium
III. Oxygen IV. Nitrogen


210) Potassium is required by which of the following regions of plants
I. Meristematic tissues II. Buds
III. Leaves IV. Root tips


211) In root nodules of legumes, leghaemoglobin is important because it


212) The number of essential elements known for the growth and reproduction of plants is


213) Which of the following minerals activate the enzymes involved in respiration?


214) Which of the following is not caused by deficiency of mineral?


215) Crop rotation is used by farmers to increase


216) The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in
leguminous root nodule is


217) Soil is able to maintain a regular supply of minerals by the help of which of the following?
I. Slow vegetation
II. Activity of decomposers
III. Soil erosion
IV. Weathering of rocks


218) Select the match ones.
I Nitrosomonas – Nitrite to nitrate
II Thiobacillus - Denitrification
III Nostoc - Free-living nitrogen-fixer
IV Azotobacter - Anaerobic nitrogen-fixer


219) In hydroponics, chelating agent is used to


220) The term ‘outer space’ represents …A…, while ‘inner space’ represents …B… with reference to absorption
of minerals
Identify A and B to complete the given statement


221) Hydroponic tomatoes may not taste so fresh. Why?


222) Which of the following is used as a chelating agent in hydroponics?


223) Sulphur is an important nutrient for optimum growth and productivity in


224) Which of the following are reservoirs for phosphorus and nitrogen cycle respectively?


225) The organ in Viscum that absorb nutrients is known


226) Insectivorous plants live in a soil that is usually deficient in


227) Humans is essential for plant growth because


228) Read the functions given below and identify the concerned nutrient
I. Activator of catalase
II. Important constituent of cytochrome
III. Important constituent of proteins involved in ETS
IV. Essential for chlorophyll synthesis


229) Nitrogen is present in the soil in the form of
I. Nitrates II. Ammonical salts
II. Nitrite IV. None of these


230) The deficiencies of micronutrients not only affects growth of plants but also vital functions, such
as photosynthetic and mitochondrial electron flow. Among the list given below, which group of
three elements shall affect most, both photosynthetic and mitochondrial electron transport?


231) Which of the following is a bacterium involved in denitrification?


232) Which of the following is one of the component of ATP?


233) Hydroponics is a technique of growing plants in a


234) Which of the following is an example of nutrient in its reduced form?


235) The source of energy for non-biological nitrogen fixation is


236) What effect can be seen on the plant growth and reproduction in the absence of essential mineral element?


237) ‘mottled chlorosis’ on the leaves occurs due to the deficiency of


238) Maximum percentage of which element occurs in plant ash?


239) Which one of the following is an amide involved in nitrogen assimilitaion by plants?


240) Which of the following is considered as partial mineral elements in plants?


241) Hydroponics is the growth of plants in


242) The major characteristics of colloids is/are


243) Mark the statements as true/ false by choosing the correct option from the set (I-IV) given below
I. Magnesium is a constituent of chlorophyll and helps to maintain the ribosome structure
II. Calcium is needed during the formation of mitotic spindle
III. Magnesium is essential for the photolysis of water
IV. Zinc helps in sugar translocation


244) Free living nitrogen fixing bacteria are


245) Name the essential element that is considered as the component of energy related to chemical compound
like chlorophyll


246) What is the correct unit for measuring nutrients in hydroponics nutrient solution?


247) Which of the following reaction shows nitrogen fixation?


248) For the limited nitrogen that is present in the soil, microbes compete with


249) Julius Von Sachs, who demonstrated hydroponics for the first time, was a German


250) Farmers in a particular region were concentrated that pre-mature yellowing of leaves of a pulse
crop might cause decrease in the yield. Which treatment could be most beneficial to obtain
maximum seed yield?


251) In the hydroponics plant production technique, in order to obtain the optimum growth, nutrient solutions
must be


252) Based on the quantitative requirement of elements by the plants, these elements are called


253) The number of essential nutrients needed in plants is


254) One of the following is called pitcher plant


255) Minerals involved in redox reactions in plant cells are


256) The conversion of nitrate to nitrogen is called


257) Enzyme required for nitrogen fixation is


258) For the proper management of diseased conditions in hydroponics, it is important to


259) Which of the following statements are not correct in reference to hydroponics?
I. It determines the mineral nutrients essential for the plants
II. The hydroponics involves the culture of plants in a soil with, defined mineral solution
III. Hydroponics requires purified water with non-defined mineral nutrient salts
IV. In the hydroponics technique, plants are grown in sandy soil with nutrient solution
V. By this method, essential elements required for the growth of plants can be identified and their
deficiency symptoms can also be discovered
Choose the correct options


260) Quantity of macronutrients that is generally found in plant is


261) Who proved for the first time that the plants contain a large number of minerals and
microelements?


262) The optimum temperature preferred for the plant growth is


263) Which of the following elements is not an essential micronutrient for plant growth?


264) Which of the following gene is responsible for biological nitrogen fixation?


265) Hydroponics are of three types …A…, a film system and …B…
Choose the correct pair from the option given below


266) Deficiency of which to the following can cause yellowing of intravenous regions of leaves?


267) The technique of growing plants in a nutrient solution in the complete absence of soil is called


268) Who demonstrated the concept of hydroponics for the first time?


269) Appearance of yellowish edges in the leaves is due to deficiency of


270) VAM is


271) Nitrogen is required mainly by which of the following parts of the plants?
I. Meristematic tissues
II. Differentiating tissues
III. Apical tissues
IV. Metabolically active cell
Choose the correct option


272) Choose the correct options


273) Macronutrients like carbon, hydrogen and oxygen are obtained mainly from


274) For a seed to germinate, the most important thing needed is


275) The entry and exit of ions to and from the symplast requires the expenditure of


276) A plant requires magnesium for


277) Which element is required for the germination of pollen grains?


278) The area around the plant roots is called


279) The ultimate source of nitrogen is


280) Select from the given options, which is the most commonly obtained commercial flower crop in
hydroponics?


281) Which one of the following elements in plants is not remobilised?


282) The plant ash indicates


283) The full form of CEA is


284) In the final phase of mineral absorption, ions are taken up into the …… space of cells


285) Major disadvantages of hydroponics include


286) The nutrient solution in flowering culture hydroponics


287) Which of the following elements can be considered as macronutrients for plants?


288) The process of decay of dead organic matter is known as


289) Nitrogen is absorbed by the plants in the form of


290) Grey spots of oat are caused by deficiency of


291) A nutritionally wild type organism, which does not require any additional growth supplement is
known as


292) Which of the following elements is considered as beneficial elements in higher plants?


293) Which of the following is limiting nutrient for both natural and agricultural ecosystems?


294) Plant deficient of element zinc, shows its effects on the biosynthesis of plant growth hormone


295) Julius Von Sachs, who demonstrated hydroponics first, was from


296) Which of the following is not considered as a trace element (micronutrient) in the plant?


297) Maximum amount of macronutrients that are generally present in plant tissue is


298) Which of the following shows the deficiency symptoms of nitrogen in plants?


299) Which of the following is a macronutrient?


300) Which of the following statements are correct about mineral absorption in plants?


301) For the uptake of ions in the first phase of absorption of minerals, the pathway followed is called


302) Necrosis is the term used for the


303) Cuscuta is a


304) Which form of nitrogen enters in the plants


305) Manganese is required in


306) Nitrite is coverted to nitrate by


307) Molybdenum causes


308) Nitrogen is a constituent of


309) Necrosis or death if tissue particularly leaf tissue, is due to the deficiency of


310) The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is
to


311) The macronutrient which is an essential component of all organic compounds, yet not obtained
by plants from soil is


312) The process of transfer of amino group from one amino acid to the keto group of a keto acid is called


313) What is the correct order of nitrogen assimilation?


314) Nitrification is the process of conversion of


315) Which of the following is a nitrogen-fixing organism?


316) Media, which is used most commonly in hydroponics is


317) Which of the following gene clusters in bacteria is responsible for nitrogen fixtion?


318) Anabaena, which is extensively used in rice cultivation, forms symbiotic association with


319) Nitrates are converted into nitrogen by


320) The appearance of yellow edges in leaves is due to the deficiency of this mineral element.


321) Minerals are absorbed by plants in


322) Which of the following is not an insectivorous plant?


323) An element playing important role in nitrogen fixation is


324) Copper is present in


325) Which of the following is used as an alternative for minerals?


326) The molecular nitrogen is correctly termed as


327) The deficiency of this micronutrient results in little leaf disease.


328) Zn, Mo, Fe, Cu are


329) Name the technique used by researchers to explore the plant nutrient deficiencies


330) Bacteria and fungi developing on dead decaying organisms are


331) Name the elements, which occur in nucleic acid macromolecule?


332) Enzymes involved in nitrogen metabolism is


333) Select the incorrect statement


334) Two nitrogen atoms are joined by


335) Which of the following is considered to be the best chemical method of fixing atmospheric
nitrogen?


336) Which of the following elements play a major role in nitrogen metabolism by activating the enzyme,
nitrogenase?


337) Chlorosis is


338) On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to the
deficiency of nitrogen. This inference could be correct only if we assume that yellowing of leaves
appeared first in


339) Choose a true statement regarding essential mineral elements of plants


340) The insectivorous plants are


341) In the initial phase of mineral absorption, ions are taken up into the …… space of cells


342) Absorption of minerals takes place in the form of


343) A metal ion involved in stomatal regulation is


344) Find out odd one form the following options by considering its role in nitrogen cycle.


345) While producing hydroponic plants, which of the following metal is added along with EDTA?


346) Which one of the following is not a micronutrient?


347) About 98% of the mass of every living organism is composed of just six element including carbon,
hydrogen, nitrogen, oxygen and


348) The bladder serving as floats for trapping insects is found in


349) Which of the following method is close to hydroponics and has the same principle?


350) Plants uptake minerals present in the soil, mostly through


351) Boron in green plants assists in


352) Separation of amino acid and carboxylic groups is called


353) Addition of chelating agent to hydroponics is necessary for


354) Which of the following mineral deficiencies will cause death of stem and root tips?


355) Which among the following is the major constituent of proteins, nucleic acids, vitamins and hormones?


356) Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing
microorganism?


357) ‘Khaira disease of rice’ is due to


358) Which one of the following is a micronutrient in plants?


359) In which of the following conditions, plants cannot be grown?


360) One of the major function of essential elements is


361) Efflux is the movement of ions


362) If by radiation all nitrogenase enzymes are inactivated, then there will be no


363) The process of conversion of nitrogen to ammonia is termed as


364) Identify the non-leguminous plants that forms nodules to fix nitrogen


365) The minerals involved in water-splitting reaction during photosynthesis are


366) Nitrifying bacteria


367) Micronutrients are


368) A small aquatic plant was put in each of the petri dishes- X, Y and Z, containing different culture
solutions. After six weeks, the plant in dish-X had the same number of leaves as it had previously
and were all small and yellowish. Plant in dish-Y had more leaves of normal size and dark green
colour. Plants in dish-Z had more leaves of normal size but very pale. Which of the following show
the elements missing the culture?


369) Essential ions are absorbed in different amounts by


370) Which of the following is/are not an essential micro nutrient?


371) For the existence of nitrogen, how many nitrogen atoms are required?


372) In the final phase of mineral absorption ions are taken up


373) Which of the following statement is true about the passive uptake of ions?


374) Active transport of ions by the cell requires


375) If the size of fruits diminishes in plants, which mineral ion should be added to soil?


376) Mineral element required by plants in the greatest amount is


377) Premature leaf fall is due to deficiency of


378) An element must be considered essential, when
I. the element is necessary for supporting normal growth and reproduction of the plants
II. the deficiency of that particular element can not be met by supplying some other element
III. the element is directly involved in the metabolism of the plants. Choose the correct pair


379) Soilless culture helps in knowing


380) Chlorosis is caused due to deficiency of


381) I. The practice of growing plants in nutrient enriched water without soil is called ….
II. The system of growing plants with their roots bathed in nutrient mist (a cloud of moisture in air) is
called…..
Complete the given statement (I and II) with the correct pair of options given below


382) A plant which lives on another plant but do not take food or anything from plant is called


383) In addition to known essential elements, there are some beneficial elements. These are required by the


384) For nitrogen fixation, useful pigment is


385) Fe can be taken by plants in the form of


386) Necrosis in crops is due to the deficiency of


387) Hydroponics were first time demonstrated in the year


388) Which element is located at the centre of the porphyryin ring in chlorophyll?


389) The structure present in cynobacteria (BGA) that helping in nitrogen fixation is


390) Statement 1: Leguminous plants are nitrogen fixers
Statement 2: Leguminous plants have Rhizobium in their root nodules


391) Statement 1: Some essential elements can alter the osmotic potential of a cell
Statement 2: Osmotic potential can be regulated by potassium


392) Statement 1: Hydroponics requires purified water mineral nutrient salts
Statement 2: Purified water and mineral salts are always not essential for the growth of hydroponics


393) Statement 1: Active absorption of minerals is inhibited when the roots are deprived of oxygen
Statement 2: Active absorption of minerals requires expenditure of metabolic energy, which comes
from respiration in the presence of oxygen


394) Statement 1: Deficiency of sulphur causes chlorosis in plants
Statement 2: Sulphur is a constituent of chlorophyll, proteins and nucleic acids


395) Statement 1: Activator of the enzyme reductase is manganese
Statement 2: Manganese deficient plants cells prefers ammonia over nitrate


396) Statement 1: Every plant can grow in a suitable mineral solution only (i.e., without soil)
Statement 2: Hydroponics do not helps in the identification of essential elements and deficiency
symptoms of the plants


397) Statement 1: Nitrogen-fixing enzyme in legume root nodules functions at low oxygen
concentration.
Statement 2: Low oxygen concentration is provided by leghaemoglobin


398) Statement 1: Warm nutrient solution is better than cold solution for producing hydroponics
Statement 2: Warm solution holds of greater amount of oxygen than cold solution