The first stable product of CO₂ fixation in sorghum is:

(1) Succinic acid

(2) Phosphoglyceric acid

(3) Pyruvic acid

(4) Oxaloacetic acid

Which of the following statements is incorrect?

1. Grana lamellae have both PSI and PS II.

2. Cyclic photophosphorylation involves both PS I and PS II.

3. Both ATP and NADPH+H⁺ are non-cyclic synthesized during photophosphorylation.

4. Stroma lamellae have PS I only and lack NADP reductase.

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

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 

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 

In Hatch and Slack pathway, the primary CO₂ acceptor is -

1. Oxaloacetic acid

2. Phosphoglyceric acid

3. Phosphoenol pyruvate

4. Rubisco

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

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric CO₂ concentration up to 0.05% can enhance CO₂ fixation rate

2. C₃ plants respond to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

3. Tomato is a greenhouse crop which can be grown in CO₂ enriched atmosphere for higher yield

4. Light saturation for CO₂ fixation occurs at 10% of full sunlight