The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:

1. 1 molecule of the 3-C compound
2. 1 molecule of the 6-C compound
3. 1 molecule of a 4-C compound and 1 molecule of the 2-C compound
4. 2 molecules of the 3-C compound

Subtopic:  Photorespiration |
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Emerson's enhancement effect and Red drop have been instrumental in the discovery of

1. two photosystems operating simultaneously

2. photophosphorylation and cyclic electron transport

3. oxidative phosphorylation

4. photophosphorylation and non-cyclic electron transport

Subtopic:  Historical View: Experiments |
 85%
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Which of the following statements is incorrect?

(1) RuBisCO is a bifunctional enzyme

(2) In C4 plants, the site of RuBisCO activity is mesophyll cell

(3) The substrate molecule for RuBisCO activity is a 5-carbon compound

(4) RuBisCO action requires ATP and NADPH 

Subtopic:  Dark Reaction : Calvin Cycle |
 80%
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In light reaction, plastoquinone facilitates the transfer of electrons from:

1. Cytb6f complex to PS-I

2. PS-I to NADP+

3. PS-I to ATP synthase

4. PS-II to Cytb6f complex

Subtopic:  Light Reactions :1 | Light Reactions |
 66%
NEET - 2020
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If the given pyrrole ring is of chlorophyll a molecule, X should be:

1. -CHO
2. -CH3
3. -CH2OH
4. -CH3COOH

Subtopic:  Photosynthetic Pigments |
 52%
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Which of the following is not a C3 plant?
1. Rice
2. Wheat
3. Maize
4. Potato

Subtopic:  C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
 77%
From NCERT
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Consider the two statements:

I. The current availability of carbon dioxide in the atmosphere is limiting for C3 plants.
II. C3 plants attain saturation at much higher carbon dioxide concentration than that present in the current atmosphere.

1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are correct

Subtopic:  Factors Affecting Photosynthesis |
 74%
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Consider the given statements:
I. In C4 plants light reactions occur in mesophyll cells whereas the carbon dioxide assimilation is carried out in bundle sheath cells
II. In CAM plants, the events are separated in time but occur in the same type of cells.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

Subtopic:  C4 Cycle (Hatch & Slack Pathway) | CAM Pathway |
 63%
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The correct sequential involvement of organelles in the photorespiratory pathway is:
1. Chloroplast → Peroxisome → Mitochondria
2. Chloroplast → Mitochondria → Peroxisome
3. Mitochondria → Chloroplast → Peroxisome
4. Mitochondria → Peroxisome → Chloroplast

Subtopic:  Photorespiration |
 72%
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The correct sequence of flow of electron during light dependent reactions in plants is:
1. P680 → P700 → water → NADP+
2. water → P700 → NADP+→ P680
3. P700 → P680 → NADP+→ water
4. water → P680 → P700 → NADP+

Subtopic:  Light Reaction: Electron Transport |
 74%
From NCERT
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