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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During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?

1. Oxygen 2. Water
3. Carbon dioxide 4. Light 
Subtopic:  Light Reaction: Photophosphorylation |
 82%
From NCERT
NEET - 2020
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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:  C4 Cycle (Hatch & Slack Pathway) |
 78%
From NCERT
NEET - 2020
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One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of:

1. Violet and green light

2. Indigo and green light

3. Orange and yellow light

4. Blue and red light

Subtopic:  Historical View: Experiments |
 90%
From NCERT
NEET - 2019
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In Hatch and Slack pathway, the primary CO2 acceptor is -

1. Oxaloacetic acid

2. Phosphoglyceric acid

3. Phosphoenol pyruvate

4. Rubisco

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 71%
From NCERT
NEET - 2019
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Study the pathway given below:

65525

In which of the following options, correct words for all the three blanks A, B and C are indicated?

A B C
1. Fixation  Transamination Regeneration
2. Fixation  Decarboxylation  Regeneration
3. Carboxylation  Decarboxylation Reduction
4. Decarboxylation Reduction  Regeneration
Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 74%
From NCERT
AIPMT - 2010
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Read the following four statements A, B, C and D and select the right option having both correct statements:

STATEMENTS:

(A) Z-scheme of light reaction takes place in the presence of PSI only
(B) Only PSI functional in cyclic photophosphorylation
(C) Cyclic photophosphorylation results in a synthesis of ATP and NADPH2
(D) Stroma lamellae lack PSII as well as NADP

Options:

1. A and B

2. B and C

3. C and D

4. B and D

Subtopic:  Light Reaction: Photophosphorylation | Light Reactions |
 82%
From NCERT
AIPMT - 2010
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In Kranz anatomy, the bundle sheath cells have:

1. thick walls, many intercellular spaces and few chloroplasts
2. thin walls, many intercellular spaces and no chloroplasts
3. thick walls, no intercellular spaces and a large number of chloroplasts
4. thin walls, no intercellular spaces and several chloroplasts
Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 89%
From NCERT
AIPMT - 2011
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Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on:

1. Membrane potential

2. Accumulation of K ions

3. Proton gradient

4. Accumulation of Na ions 

Subtopic:  Light Reaction: Photophosphorylation |
 95%
From NCERT
AIPMT - 2005
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Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because:
 

1. The primary fixation of CO2 is mediated via PEP carboxylase
2. Effective pumping of CO2 into bundle sheath cells
3. Four carbon acids are the primary initial CO2 fixation products
4. RuBisCO in C4 plants has a higher affinity for CO2

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
AIPMT - 2005
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