Quiz - biology - Photosynthesis in Higher Plants-A & R questions

Q1. Assertion (A): In photosynthesis there is synthesis of glucose but it is stored in form of starch.
Reason (R): Glucose is osmotically active while starch is osmotically inactive.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q2. Assertion (A): When Cladophora is placed on suspension of aerobic bacteria, bacteria accumulate in region of red and blue light of split spectrum.
Reason (R): In Cladophora there is maximum absorption of Blue and red light.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q3. Assertion (A): Biosynthetic phase of photosynthesis is known as dark reaction.
Reason (R): It takes place in absence of light.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q4. Assertion (A): Nomenclature of pigment systems as PS-I and PS-II is based on their functioning during light reaction.
Reason (R): During light reaction PS-II works first and PS-I works later.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q5. Assertion (A): The whole scheme of transfer of electrons starting from PS-II to NADP⁺ is called z-scheme.
Reason (R): When all the carriers of this scheme are placed in sequence on a redox potential scale. They appear like Z.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q6. Assertion (A): Both PS-I and PS-II are located on same face of thylakoid membrane.
Reason (R): Photolysis of water and reduction of NADP⁺ takes place in stroma site.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q7. Assertion (A): Like respiration in Photosynthesis too, ATP synthesis is linked to development of proton gradient across a membrane.
Reason (R): Proton gradient is the strongest source of potential energy which can be used in joining of ADP and Pi.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q8. Assertion (A): Biosynthetic phase of photosynthesis is also termed as dark reaction.
Reason (R): Biosynthetic phase is not directly dependent on light but it is supported by products of light reactions.

easy

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q9. Assertion (A): In all photosynthetic plants first fixation product during biosynthetic phase of photosynthesis is PGA.
Reason (R): PGA is the most stable product and is synthesized from both RuBP and PEP, whenever they act as first CO₂ accepting substance.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q10. Assertion (A): To make one molecule of glucose 6 turns of Calvin cycle are required.
Reason (R): In each turn of Calvin cycle there is fixation of one CO₂ only while 6CO₂ are required for each glucose.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q11. Assertion (A): C4 plants can tolerate high temperature conditions.
Reason (R): Enzyme pepcase and PPDK work only on high temperature.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q12. Assertion (A): In C4 plants there is no photorespiration.
Reason (R): In C4 plants photolysis of H₂O and Rubisco activity show space differentiation.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q13. Assertion (A): In mesophyll cells of C4 plants there is no sugar formation after fixation of CO₂.
Reason (R): In mesophyll cells there is no Rubisco so C₃ cycle events can not operate.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q14. Assertion (A): The basic pathway that results in formation of sugars, the Calvin pathway is common to the C3 and C4 plants.
Reason (R): C3 path is the only biosynthetic path which yields sugar from CO₂.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q15. Assertion (A): Photorespiration is one of the wasteful processes.
Reason (R): In Photorespiration there is no synthesis of ATP and NADPH.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q16. Assertion (A): In C4 plants Rubisco selectively shows carboxylase activity no oxygenase activity.
Reason (R): In C4 bundle sheath cell malic acid is broken down to increase intracellular CO₂ concentration.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q17. Assertion (A): In Aquatic conditions usually CO₂ concentration regulates the rate of photosynthesis.
Reason (R): In Aquatic conditions generally CO₂ is available at suboptimal level.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q18. Assertion (A): In terrestrial conditions CO₂ usually acts as main determining factor of photosynthesis.
Reason (R): Usually CO₂ is available at sub optimal level in terrestrial conditions.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q19. Assertion (A): C4 Plants were evolved to adapt for low atmospheric CO₂ concentration.
Reason (R): C4 plants have minimum CO₂ compensation point.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q20. Assertion (A): C3 plants do not show rise in photosynthesis at higher temperature.
Reason (R): Enzymes of C3 plants are high temperature sensitive as compared to low temperature sensitive enzymes of C4 plants.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q21. Assertion (A): Indirectly water stress leads to decrease in photosynthesis.
Reason (R): Water stress leads to wilt to leaves and minimize their surface area.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q22. Assertion (A): Photorespiration decreases the rate of photosynthesis.
Reason (R): RUBISCO can also behave as an oxygenase.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q23. Assertion (A): During photophosphorylation light energy is utilized to produce the proton gradient that is required for ATP synthesis.
Reason (R): Oxidative phosphorylation results as the energy of oxidation-reduction is utilized for phosphorylation.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q24. Assertion (A): Chief photosynthetic pigment is chlorophyll a but plants evolved some other pigments also.
Reason (R): Photosynthetic efficiency is increased due to absorption of variety of wavelengths.

easy

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q25. Assertion (A): Higher rate of photosynthesis is seen when plants are illuminated by wavelengths of visible light.
Reason (R): There is maximum absorption by chlorophyll a in the blue and the red regions of the visible light.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q26. Assertion (A): Cyclic photophosphorylation results only in the synthesis of ATP, but not of NADPH + H⁺.
Reason (R): Cyclic photophosphorylation occurs only when light of wavelengths beyond 680 nm are available for excitation.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q27. Assertion (A): The protons or hydrogen ions that are produced by the splitting of water accumulate within the lumen of the thylakoids.
Reason (R): The primary acceptor of electron which is located towards the outer side of the membrane transfers its electron not to an electron carrier but to an H carrier.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q28. Assertion (A): The primary acceptor of carbon dioxide in C3 plants is a 2-carbon compound.
Reason (R): The first product of carbon dioxide fixation in these plants is a C3 acid.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q29. Assertion (A): The light-independent reactions do not require light, but they are most likely to occur during day.
Reason (R): NADPH and ATP from the light-dependent reactions are used in the light-independent reactions.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q30. Assertion (A): Except for plants in shade or in dense forests, light is rarely a limiting factor for photosynthesis in nature.
Reason (R): Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q31. Assertion (A): Current availability of CO₂ levels is limiting to the C3 plants.
Reason (R): Carbon dioxide is the major limiting factor for photosynthesis.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q32. Assertion (A): Plants that do not use PEP-carboxylase in carbon fixation are C3 plants.
Reason (R): The primary carboxylation reaction in C3 plants, catalyzed by RuBisCO, produces the three carbon 3-phosphoglyceric acids directly in the Calvin Benson cycle.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q33. Assertion (A): ATP acts as the energy currency of the cell.
Reason (R): ATP is a ribonucleoside triphosphate.

easy

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q34. Assertion (A): It is possible to make calculations of the net gain of ATP for every glucose molecule oxidised; but in reality this can remain only a theoretical exercise.
Reason (R): These calculations can be made only on certain assumptions that are not really valid in a living system.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q35. Assertion (A): The alignment of the chloroplasts along the walls of the mesophyll cells vary depending on the amount of incident light.
Reason (R): The alignment of the chloroplasts along the walls of the mesophyll cells is such that they get the optimum quantity of the incident light.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q36. Assertion (A): Accessory photosynthetic pigments in higher plants enable a wider range of wavelength of incoming light to be utilised for photosynthesis.
Reason (R): Accessory pigments protect chlorophyll a from photo-oxidation.

medium

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q37. Assertion (A): The protons and O₂ formed by photolysis of water are released in the thylakoid lumen.
Reason (R): The water splitting complex is associated with the PS I, which itself is physically located on the outer side of the membrane of the thylakoid.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q38. Assertion (A): Electron transport via cytochrome b6f is responsible for creating the proton gradient that drives the synthesis of ATP in chloroplasts.
Reason (R): Cytochrome b6f complex functions to mediate the transfer of electrons and of energy between Photosystem II and Photosystem I, while transferring protons from the chloroplast stroma across the thylakoid membrane into the lumen.

hard

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q39. Assertion (A): Breakdown of proton gradient across the thylakoid membrane leads to the synthesis of ATP.
Reason (R): The gradient is broken down due to the movement of protons across the membrane to the stroma through the transmembrane channel of the CF₀ of the ATP synthase.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q40. Assertion (A): Immediately after light becomes unavailable, the biosynthetic process continues for some time, and then stops.
Reason (R): The biosynthetic phase of photosynthesis depends on the products of the light reaction.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Q41. Assertion (A): The enzyme that catalyses carboxylation of RuBP in Calvin cycle would be more correctly called RuBisCO rather than RuBP carboxylase.
Reason (R): This enzyme also has an oxygenation activity apart from a carboxylase activity.

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Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

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Biology - Photosynthesis in Higher Plants-A & R questions

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Biology - Photosynthesis in Higher Plants-A & R questions

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