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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Accessory photosynthetic pigments in most green plants areA. chlorophyll aB. chlorophyll bC. carotenoids and xanthophyllsD. both b and c |
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Answer» Correct Answer - D Chlorophyll a is found is almost all photosynthetic plants except bacteria. It is called primary photosynthetic pigment because it performs primary reacrtions of photosynthesis which involve conversion of light energy into chemical energy Other photosynthetic pigments like chorophyll a through election spin resonance and also protect chlorophyll a from photo oxidation. |
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| 902. |
In `C_(3)` plants, the first stable product of photosynthesis during dark reaction isA. Malic acidB. Oxaloacetic acidC. 3- phosglyceric acidD. Phosphoglyceraldehyde |
| Answer» Correct Answer - C | |
| 903. |
Given graph represents the absorption specra of three photosynthetic pigments chl a, chl b and `beta`-carotene. Select the correct statement regarding this.A. The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called as absorption spectrumB. chl a and chl b absorb maximum light in blue and red wavelengths of light.C. Rate of photosynthesis is maximum in blue and red wvelengths of light.D. All of these |
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Answer» Correct Answer - D The graphical curve showing the amount of energy of different wavelengths of light absorbed by a pgment is called absorption spectrum,. It is studies with the help of spectrophotometer. The absorption spectra of chorophylls a and b show that they absorb maximum light in the blue-violet and red wavelengths. The pgments are often known after the wvelength which is absorbed to the maximum e.g., chl `a_(673)` Chl `a_(683)(P_(680)),` Chl `a_(703) (P_(700))`. |
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| 904. |
Which of the following kinds of plant fixes carbon dioxide by way of crassulacean acid metabolism (CAM)A. Oak treeB. GrassC. Red algaeD. Cactus (succulents) |
| Answer» Correct Answer - D | |
| 905. |
Read the given statements and select the correct option. Statement 1: Crassulacean acid metabolism occurs in succulent plants which grow in xeric conditions. Statement 2: Stomata are generally sunken in succulent plants.A. Both statement 1 and 2 are correct.B. Statement 1 is correct but statement 2 is incorrect.C. Statement 1 is incorrect but statement 2 is correctD. Both statements 1 and 2 are incorrect. |
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Answer» Correct Answer - A Crassulacean acid metabolism is a mechanism of photosynthesis involving double fixation of `CO_(2)` which occurs in succulents belonging gto Crassulaceae, Cacti, Euphoribas and some other plants of dry habitats where the stomata remain closed during the daytime and open only at night, e.g., Sedum, kalanchoe, Opunita. Sunken stomata are deep seated stomata in which subsidiary cells lie above the guard cells. |
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| 906. |
Which of the following kinds of plant fixes carbon dioxide by way of crassulacean acid metabolism (CAM)A. Oak treeB. CactusC. GrassD. Red alga |
| Answer» Correct Answer - B | |
| 907. |
In a condensed schematic representation of drak reaction of photosynthesis gien below , steps are indicated by alphabets. Select the option where the alphabets are correctly identified A. A-`CO_2` fixation , B-Phosphorylation, C-Regeneration , D-ReductionB. A-`CO_2` fixation , B-Reduction , C-Phosphorylation , D-RegenerationC. A-Regeneration , B-`CO_2` fixation , C-Reduction ,D-PhosphorylationD. A-`CO_2` fixation , B-Phosphorylation , C-Reduction , D-Regeneration |
| Answer» Correct Answer - D | |
| 908. |
the first intermediate formed during photosynthesis isA. Fructose 1, 6- diphosphateB. Ribulose 1, 5-biphosphateC. Xylulose-5-phosphateD. Phosphoglyceraldehyde |
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Answer» Correct Answer - D 3 molecules of `CO_(2)` combine with 3 molecules of RuBP to produce 3 molecules of an unstable 6-C compound which immediately breaks down into molecules of 3-phosphoglyceric acid. |
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| 909. |
Which is the stable intermediate of photosynthesisA. glucoseB. formaldehydeC. phosphoglyceric acidD. phosphoglyceraldehyde |
| Answer» Correct Answer - C | |
| 910. |
Photosynthetic pigments found in the chloroplasts occur inA. thylakoid membranesB. plastoglobulesC. matrixD. chloroplast envelope |
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Answer» Correct Answer - A Photosynthetic pigments are those pigments which occur on photosynthetic thylakoids of chloroplast and absorb light energy for the purpose of photosynthesis. These are mainly of two types-chlorophylls and carotenoids. |
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| 911. |
The first carbon fixation in `C_(4)` pathway occurs in chloroplasts ofA. Guards cellsB. Mesophyull cellsC. Bundle sheath cellsD. Epidermal cells |
| Answer» Correct Answer - B | |
| 912. |
Chlorophyll is soluble inA. WaterB. Organic solventsC. Both A and BD. None of the above |
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Answer» Correct Answer - B Chlorophyll is soluble in organic solvents. |
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| 913. |
In a condensed schematic representation of drak reaction of photosynthesis gien below , steps are indicated by alphabets. Select the option where the alphabets are correctly identified A. `A=CO_(2)` fixaiton, B=Reduction, C=Phosphrorylaiton, D=RegnerationB. A=Regeneration ,B=`CO_(2)` fixation C=Reduction, D=Phosphrorylaiton,C. `A=CO_(2)` fixation, B=Phosphrorylaiton, C=Reduction, D=RegenerationD. |
| Answer» Correct Answer - C | |
| 914. |
Which of the following plants stand intermediate between `C_(3)` and `C_(4)` plantsA. Triticum aestivumB. Zea mayaC. Panicum millodesD. All of these |
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Answer» Correct Answer - A `C_(3) and C_(4)` cycle both occurs in panicum milioides hence it stand intermediate between `C_(3) and C_(4)` palnts. |
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| 915. |
Agraol chloroplasts occur in certain Or Atriplex spongiosa is aA. SuccuelentsB. `C_(4)` plantsC. HydrophytesD. `C_(3)` plants |
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Answer» Correct Answer - B In `C_(4)` plants agranal chloroplast occur in bundle sheath. |
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| 916. |
At carbon atom III, chlorophyll a hasA. Methyl groupB. Aldehyde groupC. Carboxyl groupD. Magnesium |
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Answer» Correct Answer - A At carbon atom III, chlorophyll a has Methyl group. |
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| 917. |
Who first of all indicated that water is electron donor in photosynthesis ?A. ArnonB. CalvinC. EmersonD. van Niel |
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Answer» Correct Answer - D van Neil first of all indicated that water is electron donor in photosynthesis. |
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| 918. |
In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the cells ofA. EpidermisB. MesophyllC. Bundle sheathD. Phloem |
| Answer» Correct Answer - B | |
| 919. |
In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the cells ofA. MesophyllB. Bundle SheathC. PhloemD. Epidermls |
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Answer» Correct Answer - B In `C_(4)` plants initial `CO_(2)` fixation occurs in mesophyll cells. As a result malic acid is formed. This malic acid is transfermed in bundle sheath chloroplast where it is decarboxylated. |
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| 920. |
In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the cells ofA. Guard cellsB. Epidermal cellsC. Mesophyll cellsD. Bundle sheath |
| Answer» Correct Answer - C | |
| 921. |
In sugarcane plant `^(14)CO_(2)` is fixed in malic acid, in which the enzyme that fixes `CO_(2)` isA. ribulose phosphate kinaseB. fructose phosphataseC. ribulose biphosphate carboxylaseD. phosphoenol pyruvic acid carboxylase |
| Answer» Correct Answer - D | |
| 922. |
In sugarcane plant `^(14)CO_(2)` is fixed in malic acid, in which the enzyme that fixes `CO_(2)` isA. RuBP carboxylaseB. PEP carboxylaseC. Ribulose phosphate kinaseD. Fructose phosphatase |
| Answer» Correct Answer - B | |
| 923. |
In the leaves of `C_(4)` plants, malic acid formation during `CO_(2)` fixation occurs in the cells ofA. epidermal cellsB. mesophyll cellsC. bundle sheathD. guard cells |
| Answer» Correct Answer - B | |
| 924. |
In `C_(4)` plants, Calvin cycle operates inA. stroma of bundle sheath chloroplastsB. grana of bundle sheath chloroplastsC. grana of mesophyll chloroplstsD. stroma of mesophyll chloroplasts |
| Answer» Correct Answer - A | |
| 925. |
In `C_(4)` plants, Calvin cycle operates inA. Grana of mesophyll chloroplastsB. Stroma of chloroplasts in mesophyll cellsC. Bundle sheath cells chloroplastsD. Wrong statements wrong |
| Answer» Correct Answer - C | |
| 926. |
In `C_(4)` plants, Calvin cycle operates inA. stroma of bundle sheath chloroplastsB. grana of bundle sheath chloroplastsC. grana of mesophyll chloroplastsD. stroma of mesophyll chloroplats |
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Answer» Correct Answer - A `C_(4)`-plants possess two types of chloroplasts granal in mesophyll cells and agrenal in bundle sheath cells. Mesophyll cells are specialised to perform light reaction and bundle sheath cells possess `RuBisCO, here `CO_(2)` is fixed through calvin cycle. |
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| 927. |
Radioactive isotopes employed to study photosynthesis areA. `""^(11)C` and `""^(32)P`B. `""^(15)C` and `""^(32)P`C. `""^(16)C` and `""^(15)N`D. `""^(14)C` and `""^(18)O` |
| Answer» Correct Answer - D | |
| 928. |
Isotopes used in photosynthesis wereA. PS -IB. PS-IIC. Calvin cycleD. None-cyclic ETS |
| Answer» Correct Answer - D | |
| 929. |
Which of the following is not a product of light reaction of phtosynthesisA. ATPB. NADHC. NADPHD. Oxygen |
| Answer» Correct Answer - B | |
| 930. |
Which of the following is not a product of light reaction of phtosynthesisA. OxygenB. NADPHC. NADHD. ATP |
| Answer» Correct Answer - C | |
| 931. |
Which of the following statements is correct about `C_4` type of phtosynthesis ?A. `C_4` -cycle is an independent cycleB. `C_4` - cycle is adjacent of Calvin cycleC. RuBP carboxylase has higher affinity for ` CO_2`D. Carboxylase is present in the bundle sheath cells |
| Answer» Correct Answer - B | |
| 932. |
Dark reactions of phtosynthesis occur inA. GranaB. ThylakoidC. Stroma lamellaeD. ) Stroma |
| Answer» Correct Answer - D | |
| 933. |
The oxygen produced during phtosynthesis comes from photolysis of water was first time proved byA. Rubben and KamenB. Robert MayerC. Malvin CalvinD. Blackman |
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Answer» Correct Answer - A Photolysis occur in pressence of light quanta and requires `Mn^(+ +)` and `Cl^(-)` ions as catalyst for water oxidising. `4H_(2)Ooverset(Mn^(+ +)Cl^(-))to4(OH)^(-)+4H^(+)` Then H radicle forms water and `O_(2)` as a by product `4OHto2H_(2)O+O_(2)uarr` |
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| 934. |
The isotopes that have proved useful in reseaches on photosynthesis areA. `O_15 and O^14`B. `C^11 and P^32`C. `P^32 and O^18`D. `C^14 and O^18` |
| Answer» Correct Answer - D | |
| 935. |
Through the use of oxygen-18 (heavy oxygen), scientists have found that the oxygen released during photosynthesis comes from molecules ofA. carbon dioxideB. waterC. glucoseD. chlorophyll |
| Answer» Correct Answer - B | |
| 936. |
Which of the following is not a significance of photosynthesis ?A. Glucose synthesis for most of consumerB. Increase in green house effectC. Provides `O_(2)` for synthesis of ozone umbrellaD. Provides `O_(2)` for cell respiration. |
| Answer» Correct Answer - B | |
| 937. |
Which pair is wrongA. `C_(3)` plant-MaizeB. Calvin cycle-PGAC. Hatch-Slack cycle -OAAD. `C_(4)` plant-Kranz anatomy |
| Answer» Correct Answer - B | |
| 938. |
Oxygen during photosynthesis comes from water was proved by `O^(18)` experimentA. Ruben and KamenB. HillC. WarburgD. Blackman |
| Answer» Correct Answer - B | |
| 939. |
In a CAM plant the concentration of organic acidA. decreases during dayB. increases at nightC. Both (a) and (b)D. remains same always |
| Answer» Correct Answer - C | |
| 940. |
In a CAM plant the concentration of organic acidA. increases during the dayB. decreases or increase during the dayC. increases during nightD. decreases during any time |
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Answer» Correct Answer - C In CAM plants , `CO_2` enteries into the leaf and is fixed into oxalacetic acid , which is then converted to malic acid at night when stomata are open. This malic acid is stored in cells during night . So, in CAM palnts. Organic acids accumulate for their concentration increases) in the dark (i.e. at night in vacuoles. |
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| 941. |
In CAM plants , organic acids are decarbonxylatedA. dayB. nightC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - A | |
| 942. |
Assertion : Dark acidification of cytoplasm occurs in CAM plants. Reaon : Orgnaic acids are decarboxylated during night.A. If both Assertion % Reson ar true and the reason is the correct explanation of the asserition the mark (1)B. If both Assertion % Reason are true but the reason, is not the correct explanation of the assertion ,then mark (2)C. If Assetion is true statement but Reason is false , The mark (3)D. If both Assertion and Reason are false statements, the mark (4) |
| Answer» Correct Answer - C | |
| 943. |
The plant family that does show CAM pathway isA. CrassulaceaeB. EuphorbiaceaeC. CactaceaeD. Gramineae |
| Answer» Correct Answer - D | |
| 944. |
Assertion : Dark acidification of cytoplasm occurs in CAM plants. Reaon : Orgnaic acids are decarboxylated during night.A. If both Assertion and Reason are true and the Reason is the correct explanationB. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.C. If Assertion is true, but Reason is false.D. If both Assertion and Reason are false. |
| Answer» Correct Answer - C | |
| 945. |
Which of the following equations holds true for acidification reactions of CAM pathway?A. `PEP+CO_(2)+H_(2)Ooverset("PEPCase")rarrOA A+H_(3)PO_(4)`B. `OA A+NADHoverset("Dehydrogenase")rarr"Malic acid"+NAD^(+)`C. `"Malic acid"+NADP^(+)underset("enzyme")overset("Malic")rarr"Pyruvic acid"+CO+NADPH`D. |
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Answer» Correct Answer - D Crassulacean plants have developed a unique mechanism to perform photosynthesis without much loss of water. They perform acidification or dark fixation of `C_(2)` during night and deacidification during day. During night. When acid (PEP) to form oxaloacetic acid (O A A) in the presence of enzyme PEP carboxylase. OA A is subsequencly converted to malic acid in the presence of enzyme malic dehydrogenase. Malic acid produced in dark as a result of acidification is stored in the vacuoles. During day. When stomata are closed, the malic acid is decarboxylated to produce pyruvic acid and evolve `CO_(2)` (deacidification) |
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| 946. |
During light reaction in photosynthesis the following are formed.A. ATP and sugarB. hydrogen, `O_(2)` and sugarC. ATP, hydrogen donor and `O_(2)`D. ATP, hydrogen and `O_(2)` donor |
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Answer» Correct Answer - C Light reactions occur inside thylakoids. It is dependent upon light. It involves photolysis of water (breaking of water into `H_(2)` and `O_(2)`) and production of assimilatory power (NADPH and ATP). Electron released ruring photolysis of water are picked up by `P_(680)` photocenre of photosystem II. From here electrons passes over series of carrier which include PQgt Cytochrome b-f complex and PCgt while passing over cytochrome complex, the electron losses sufficient energy for creation of proton gradient and ATP from ADP and inorganic of photosystem i, which pushes out electron after absorbing light energy . Electron passes over carriers FeS, ferredoxin and NADP-reductase which gives electron to `NADP^(+)` for combining with `H^(+)` to produce NADPH. `NADP^(+)+2e^(-)+H^(+)underset("NADP reductase")rarrNADPH` |
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| 947. |
PEP is primary `CO_(2)` acceptor inA. `C_(4)` plantsB. `C_(3)` plantsC. `C_(2)` plantsD. both `C_(3)` and `C_(4)` plants. |
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Answer» Correct Answer - A In `C_(4)` plants, initial fixation of `CO_(2)` or carboxylation occurs in mesophyll cells. The chloroplasts of mesophylls cells possess enzyme PEP carboxylase (or PEP cae) for initial fixation of `CO_(2)`. The primary acceptor of `CO_(2)` is phosphoenol pyruvate or PEP. It cobines with `CO_(2)` in the presence of PEP carboxylase (or PEP case) to form oxaloacetic acid or oxaloacetate (O A A). |
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| 948. |
During light reaction of photosynthesis, which of the following phenomena is observed during cyclic and non-cyclic photophosphorylation ?A. Formation of ATPB. Formation of `NADH_(2)`C. Release of `O_(2)`D. Involvement of PS I and PS II both |
| Answer» Correct Answer - A | |
| 949. |
Secondary acceptor of `CO_(2)` in `C_(4)` plants isA. PEPB. RUBPC. PGALD. Rubisco |
| Answer» Correct Answer - B | |
| 950. |
Who described `C_(4)` pathway for the first time ?A. Pyruvic acidB. Phosphoenol pyruvicC. Acetic acidD. Oxaloacetic acid |
| Answer» Correct Answer - A | |