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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.
| 701. |
Compensation point isA. Where there is neither photosynthesis nor respirationB. When rate of photosynthesis is equal to the rate of respirationC. When entire food synthesis into photosynthesis remain utilizedD. When there is enough water just to meet the requirement of plant |
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Answer» Correct Answer - B Compensation point is existed in morning and evening time. At this time the rate of photosynthesis (intake of `CO_(2)`) and rate of respiration (outcome of `CO_(2)`) is equal. At this point no exchange of `CO_(2)` is possible through stomata. The unit is lumen. |
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| 702. |
Which of the following photosynthetic characteristics are present in `C_(3)` plants but not in `C_(4)` plants- I. `CO_(2)` compensation point of 0-10 ppm- II. Relatively higher rate of photorespiratory `CO_(2)` evolution- III. Presence of well developed bundle sheath- IV. Initial involvement of RUBP carboxylase in `CO_(2)` assimilation - Select the correct answer using the codes given belowA. I, II, IIIB. I, II, IVC. I, IIID. II, IV |
| Answer» Correct Answer - D | |
| 703. |
Under conditions of constant illumination, The compensation period for a whole aquarium would be infinite length whenA. The biomass of animals equals the biomass of plantsB. The respitory excanges of the animals are equal to the photosynthetic exchanges of the planetsC. The oxygen intake of the animals equals of oxygen output of photosynthesisD. The carbon dioxide output of thre animals and plants equals to the photosynthetic intake of the plants |
| Answer» Correct Answer - D | |
| 704. |
What plant is used in a experiment commonly performed in a laboratory in demonstrate eveloution of oxygen in photosynthesieA. SunflowerB. HydrillaC. CrotonD. Balsam |
| Answer» Correct Answer - B | |
| 705. |
Warburg effect is decrease in the rate of photosynthesis atA. Low carbon dioxide concentrationB. High oxygen contentC. High carbon dioxide concentrationD. Both A and B |
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Answer» Correct Answer - B Warburg effect is decrease in the rate of photosynthesis at high oxygen content. |
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| 706. |
Warburg effect has not been observed inA. MaizeB. SugarcaneC. SorghumD. All of these |
| Answer» Correct Answer - D | |
| 707. |
Warburg effect is related withA. Concentration of `O_(2)`B. Concentration of `N_(2)`C. Concentration of `H_(2)`D. Concentration of Cl |
| Answer» Correct Answer - A | |
| 708. |
Photorespiration occurs inA. Green photosynthetic partsB. All living cellsC. MitochondriaD. Root |
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Answer» Correct Answer - A Photorespiration occurs in green photosynthesis parts of `C_(3)` plants. |
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| 709. |
High `CO_(2)` compensation point is found inA. `C_3` -plantsB. `C_4` - plantsC. CAM plantsD. algae |
| Answer» Correct Answer - A | |
| 710. |
In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable.A. Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonateB. Amount of oxygen evolved increases as the availability of carbon dioxide increases.C. Amount of oxygen evolved decreases as the availability of carbon dioxide increases.D. Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate |
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Answer» Correct Answer - D The addition of `NaHCO_3` to water in the given experimental set up causes the availability of , more `CO_2` for photosynthesis. Thus , the amount of oxygen evolved increases. |
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| 711. |
One of the earliest experiments on photosynthesis was done in 1770 by Joseph Priestley.He demonstrated thatA. sunlight is the energy sourceB. water is requiredC. plants and animals "restore" the air for each otherD. chlorophyll captures light energy |
| Answer» Correct Answer - C | |
| 712. |
Assertion : The concentration of `O_(2)` in atmosphre is inhibitary to photosynthesis. Reason : Oxygen inhibitory effect is due to Warburg effect.A. If both the asserition and the reasion are true and the reason is a correct explanation of the assertionB. If both the assertion and reasoni s not a correct ecplanation of the assertioC. If the assertion is true but the reason is falseD. If both the asseertion and reason are false |
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Answer» Correct Answer - A Small quantity of oxygen is essential for photosynthesis except in some anaerobic bacteria. The inhibition of photosynthesis at high `O_(2)` levels may be due to (i) Oxygen takes part in oxidation of photosynthetic pigments, intermediates and enzymes in the presence of strong light (photo-oxidation), (ii) Oxidation is a strong quencher of excited state of chlorophyll, (iii) it converts RuBP carboxylase to RuBP-oxygen. At a very high decline in all plants. The phenomenon is called Warburg effect (reduction due to photorespiration). |
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| 713. |
It is advantageous to use Hydrilla to demonstrate photosnthesis than land plants asA. it respires slowlyB. it does not transpireC. it photosynthesizes rapidlyD. oxygen bubbles can be collected over water |
| Answer» Correct Answer - D | |
| 714. |
For demonstration of photosynthesis experiments, usually aquatic plant Hydrilla is used , not any terrestrial plant , why ?A. it carries out faster photosynthesisB. `O_2` is released throughout and can accumulate over the waterC. it respires slowlyD. None of the above |
| Answer» Correct Answer - B | |
| 715. |
At high oxygen concentration, the rate of photosynthesis decreases due toA. Richmond Lang effectB. Warburg effectC. Emerson effectD. Pasteur effect |
| Answer» Correct Answer - BB warburg effect | |
| 716. |
Nobel Prize was awarded to the scientist for discovering the pathway of carbon assimilationA. WatsonB. KrebsC. CalvinD. Parnas |
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Answer» Correct Answer - C Nobel Prize was awarded to the scientist for discovering the pathway of carbon assimilation by Calvin. |
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| 717. |
Which of the following is not an external factor influencing photosythesid?A. `CO_(2)` concentrationB. `O_(2)` concentrationC. Availability of waterD. Chlorophyll concentration |
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Answer» Correct Answer - D The process of photosynthesis is influenced by several factors, which include both internal (plant) and external (enviormnmental) factor. The plant factos include the number, size, age and orientation of leaves, presence or absence of hormones, leaf anatomy. amount of chlrophyll, etc. The external factors would include the availability of sunlight. temperature concentration of `CO_(2)` and `O_(2)` and water. |
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| 718. |
Which of the statements is not true of the `C_(4)` pathwayA. It requires more energy than the `C_(3)` pathway for production of glucoseB. It overcomes loss due to photorespirationC. The `CO_(2)` acceptor is a `C_(3)` compoundD. It is inhibited by high `CO_(2)` concentration |
| Answer» Correct Answer - C | |
| 719. |
Photophosphorylation means synthesis ofA. ATP from ADPB. NADPC. ADP from ATPD. PGA |
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Answer» Correct Answer - A Photophosphorylation means synthesis of ATP from ADP. |
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| 720. |
A process that makes important diference between `C_(3)` and `C_(4)` plants isA. TranspirationB. GlycolsisC. PhotosynthesisD. Photorespiration |
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Answer» Correct Answer - D Photorepiration is absent in `C_(4)` plants. |
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| 721. |
The correct sequence of cell organelles during photores piration isA. Cloroplast-Golgi bodies-mitochondriaB. chloroplast-rough endoplasmic reticulum-dictyosomesC. chloroplast-mitochondria-peroxisomeD. chloroplast-vacuole-peroxisome |
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Answer» Correct Answer - C None of the option is correc. Photorespiration required three cell organelles in sequence of chloroplast, peroxisome and mitochondria. Option (c) may be correct if be read as said sequence. |
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| 722. |
Which colour of light gives maximum absorption peak of chlorophyll aA. RedB. BlueC. greenD. Yellow |
| Answer» Correct Answer - B | |
| 723. |
Algae often float on surface of water during day but sink down during night due toA. Evolution and trapping of oxygen bubbles during the clay in their photosynthesisB. Becoming light as they consume most of their food in the nightC. Warming action of sun during the dayD. Re lease of absorbed air by warming of water |
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Answer» Correct Answer - A Algae often float on surface of water during day but sink down during night due to evolution and trapping of oxygen bubbles during the day in their photosynthesis. |
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| 724. |
Algae aften float on surface of water during day but sink down during night due toA. evolution and trapping of oxygen bubbles during day in their photosynthesisB. becoming light as they consume most of their food in the nightC. warming action of sun during the dayD. release of absorbed air by warming of water |
| Answer» Correct Answer - A | |
| 725. |
Kranz anatomy is not exhibited by which of the following plants?A. MaizeB. SorghumC. SugarcaneD. Sunflower |
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Answer» Correct Answer - D Kranz anatomy is shown by `C_(4)` plants such a Sorghum sugarcane, maize, Cyperus rotundus, etc. |
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| 726. |
Which of the following statements is incorrect regarding the Calvin cycle of `C_(3)` plants?A. First stable product of Calvin cycle in `C_(3)` plants is 3-Phosphoglyceric acid.B. Sunflower is an example of `C_(3)` plants.C. Calvin cycle occurs in bundle sheath cells of `C_(3)` plants.D. Enzyme PEP case is absent in `C_(3)` plants. |
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Answer» Correct Answer - C In `C_(3)` plants bundle sheath cells usually do not contain chloroplasts and the whole `C_(#)` cycle operates in mesophyll cells of leaves. |
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| 727. |
Calvin cycle isA. Dependent on lightB. Not dependent on lightC. Occurs in lightD. None of the above |
| Answer» Correct Answer - B | |
| 728. |
ATP synthesis during light reaction isA. Oxidative phosphorylationB. PhotolysisC. PhotophosphorylationD. Phosphorylation |
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Answer» Correct Answer - C ATP synthesis during light reaction is photophosphorylation. |
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| 729. |
Which of the following statement is incorrect for chemiosmotic hypothesis ?A. It explains formation of ATP moleculesB. It is linked with development of proton gradientC. it does not involve photolysisD. it was proposed by Peter Mitchell |
| Answer» Correct Answer - C | |
| 730. |
Identify the incorrect statement with respect to Calvin cycleA. The carboxylation of RuBP is catalysed by rubiscoB. The first stable intermediate compound formed is phosphoglycerateC. 18 molecules of ATP are synthesied during carbon fixationD. `NADPH+H^(+)` produced in light reaction is used to reduce diphosphoglycerate |
| Answer» Correct Answer - C | |
| 731. |
Which of the follwing would happen if the supply of `O_(2)` is decreased to an illuminated wheat plantA. Its photosynthesis would decreaseB. Its respiration would increaseC. Its photosynthesis would increaseD. All the physiological process will stop |
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Answer» Correct Answer - C If the amount of oxygen in the atmosphere decreases than photosynthesis will increase in `C_(3)` cycle (wheat) and no change in `C_(4)` cycle. |
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| 732. |
Read the following statements and find out the incorrect statementA. Second step of Calvin cycle (i.e, reduction) involve utilisation of 2 molecules of ATP for reduction and 2 of NADPH for phosphorylation per `CO_(2 )` molecule fixedB. The regeneration steps require one ATP for phosphorylation to fonn RuBP.C. It is probably to meet the differences in number of ATP and NADPH used in dark reaction that the cyclic phosphorylation takes place.D. Plants that are adapted to dry tropical regions have the `C_(4)` pathway |
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Answer» Correct Answer - A Second step of Calvin cycle (i.e, reduction) involve utilisation of 2 molecules of ATP for phosphorylation and 2 of NADPH for reduction per `CO_(2)` molecule fixed. |
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| 733. |
Oxygen is not produced during photosynthesis byA. CharaB. CycasC. NostocD. Green sulphur bacteria |
| Answer» Correct Answer - D | |
| 734. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?A. `C_(3)` plants respond to higher temperatures with enhanced photosnthesis while `C_(4)` plants have much enhanced photosynthesis wtule lower temperature optimum·B. Tomato is a greenhouse crop which can be grown in `CO_(2)` enriched atmosphere for higher yield .C. Tomato is a greenhouse crop which can be grown in `Co_(2)`- enriched atmosphere for higher yield.D. Light saturation for `CO_(2)` fixation occurs at 10 % of full sunlight . |
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Answer» Correct Answer - B `C_(4)` plants respond to higher temperatures with enhanced photosynthesis while `C_(3)` plants have much lower temperature optimum. |
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| 735. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?A. Light saturation for `CO_(2)` fixation occurs at 10% of full sunlightB. Increasing atmospheric `CO_(2)` concentration uo to 0.05% can enhance `CO_(2)` fixation rateC. `C_(3)` plants responds to higher temperature with enhanced photosynthesis whil,e `C_(4)` plantshave much lower temperature optimumD. Tomato is green house crop which can be grown in`CO_(2)` enriched atmosphere for higher yield |
| Answer» Correct Answer - C | |
| 736. |
The plant or internal factors affecting photosynthesis are dependent on the (A)_____ and the (B)____ of the plant. |
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Answer» Correct Answer - A-genetic predisposition B-growth |
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| 737. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?A. Light saturation for `CO_(2)`-fixation occurs at 10% of full sunlightB. increasing atmospheric `CO_(2)` concentration upto 0.05% can enchance `CO_2`-fixation rateC. `C_(3)`-plants respond to higher temperature with enchanced photosynthesis, while `C_(4)`-plants have much lower temperature optimumD. Tomato is greenhouse crop, which can be grown in `CO_(2)` enriched atmosphere for higher yield. |
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Answer» Correct Answer - C In `C_(4)`-plants, the initial fixation of `CO_(2)` occurs in mesophyll cells. The primary acceptor of `CO_(2)` in phosphoenol Pyruvate (PEP). It combines with `CO_(2)` in the presence of enzyme PEP carboxylase to form the first stable product, i.e. Oxalo acetic Acid (OAA). Where as `C_(3)`-plants lack `PEP_("carboxylase")` enzyme. The possess RuBisCO enzyme. This enzyme can work as both carboxylase (fixation of `CO_(2)`) and oxygenase (fixation of `O_2`). RuBisCO has a much greater affinity for `CO_(2)` than for `O_(2)` and the binding is competitive. At higher temperature, its affinity for `CO_(2)` decrease and it works as oxygenase. Therefore, at higher temperature photosynthesis decrease in `C_(3)`-plants, while in `C_(4)`-plants it increases. |
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| 738. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?A. Light saturation for `CO_(2)` fixation occurs at 10% of full sunlight.B. Increasing atmospheric `CO_(2)` concentration up to 0.05% can enhance `CO_(2)` fixation rate.C. `C_(3)` plants responds to higher temperatures with enhanced photosynthesis while `C_(4)` plants have much lower temperature optimum.D. Tomato is a greenhouse crop which can be grown in `CO_(2)`- enriched atmosphere for higher yield. |
| Answer» Correct Answer - C | |
| 739. |
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?A. Light saturation for ` CO_(2)` fixation occurs at 10% of full sunlightB. Incrasing atmospheric `CO_(2)` concentration upto 0.05% can enhance `CO_(2)` fixation rateC. `C_(3)` plants responds to higher temperatures with enhanced photosythesis while `C_(4)` plants have much lower temperature optimumD. Tomato is a greenhouse crop which can be grown in ` CO_(2)` enriched atmosphere for higer yield . |
| Answer» Correct Answer - C | |
| 740. |
Name the internal or plant factors that affect the rate of photosynthesis |
| Answer» Correct Answer - Number, size, age and orientation of leaves, mesophyll cells, chloroplasts, internal `CO_(2)` concentration and the amount of chlorophyll. | |
| 741. |
Which of the following factors affect rate of photosynthesis ?A. only IIIB. I and IIC. Only IVD. I, II and III |
| Answer» Correct Answer - D | |
| 742. |
Photosynthesis of maize palnt differ from wheat plant inA. Number of ATP reqired per `CO_(2)` fixationB. Having spatial soparation in both carboxylationsC. Having PEP case activityD. All of these |
| Answer» Correct Answer - D | |
| 743. |
Maize is aA. `C_2`-plantB. `C_3`-plantC. `C_4`-plantD. CAM plant |
| Answer» Correct Answer - C | |
| 744. |
`CO_(2)` concentrating steps are found inA. `C_(3)` plantB. `C_(4)` plantsC. CAM plantsD. Temperate plants |
| Answer» Correct Answer - B | |
| 745. |
Number of carboxylations in the photosynthesis in sorghym and maize isA. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - B | |
| 746. |
Kranz anatomy isA. Having peripheral reticulurn in chloroplastB. Presnence of distinct bundle sheathC. Dimorphic chloorplastD. Large vacuoles in mesophyll cells |
| Answer» Correct Answer - B | |
| 747. |
In `C_(4)` plants , the first product isA. 3-PGAB. OAAC. Malic acidD. Glutamic acid |
| Answer» Correct Answer - B | |
| 748. |
In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to perform, respectively,A. Light reaction and dark reactionB. Dark reaction with light reactionC. Light reaction and photorespirationD. Photorespiration and dark reaction |
| Answer» Correct Answer - A | |
| 749. |
Assertion: `C_(4)` pathwat of `CO_(2)` rixation is found in some tropical plants. Reason : In this pathway `CO_(2)` is fixed by 3C compound.A. If both the asserition and the reasion are true and the reason is a correct explanation of the assertionB. If both the assertion and reasoni s not a correct ecplanation of the assertionC. If the assertion is true but the reason is falseD. If both the asseertion and reason are false |
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Answer» Correct Answer - B `C_(4)` pathway found in tropical angiosperms and called as Hatch and Slack cycle. Here `CO_(2)` is fixed by 3C compond (phosphoenol pyruvate, PEP). |
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| 750. |
Assertion : Six molecules of `CO_(2)`and twelve molecules of `NADPH^(+)H^(+)` and 18 ATP are used to from one hexose molecule. Reason : Light reaction result in formation of ATP and `NADPH_(2)`A. If both the asserition and the reasion are true and the reason is a correct explanation of the assertionB. If both the assertion and reasoni s not a correct ecplanation of the assertionC. If the assertion is true but the reason is falseD. If both the asseertion and reason are false |
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Answer» Correct Answer - B Six molecules of `CO_(2)` enter Calvin cycle to produce one hexose molecule whereas `18 ATP, 12 NADPH + H^(+)` molecules are used up. The light reaction of photosynthesis results in ATP and `NADPH_(2)` formation. |
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