Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:

1.	They show an increased rate of photosynthesis at higher carbon dioxide concentrations.
2.	They can respond to high carbon dioxide conditions even in low light conditions.
3.	They show C4 pathway for carbon fixation at high carbon dioxide is the limiting factor in such plants.
4.	Only carbon dioxide is the limiting factor in such plants.

Consider the following two statements:

1. Both statements are correct and II explains I

2. Both statements are incorrect

3. I is correct and II is incorrect

4. I is incorrect and II is correct

For assimilation of one CO₂ molecule via photosynthesis, the energy required in form of ATP and NADPH₂ are:

(1) 2 ATP and 2 NADPH₂ 

(2) 5 ATP and 3 NADPH₂ 

(3) 3 ATP and 2 NADPH₂ 

(4) 18 ATP and 12 NADPH_2. 

In the given diagram, X, Y, and Z respectively represent the absorption spectrum of:

1. Chlorophyll a, Chlorophyll b, and Carotenoids

2. Chlorophyll b, Chlorophyll a, and Carotenoids

3. Chlorophyll b, Carotenoids, and Chlorophyll a

4. Chlorophyll a, Carotenoids, and Chlorophyll b

In the diagrammatic representation of the Hatch and Slack pathway, A and B respectively represent:

1. Mesophyll cells and Bundle sheath cells

2. Bundle sheath cells and Mesophyll cells

3. Bundle sheath cells and Palisade cells

4. Mesophyll cells and Guard cells

Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in

(1) C₃ -plants 

(2) C₄ -plants

(3) C₂ -plants

(4) C₃ and C₄ -plants

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

(1) Light saturation for CO₂-fixation occurs at 10% of full sunlight.

(2) Increasing atmospheric CO₂ concentration upto 0.05% can enhance the CO₂-fixation rate

(3) C₃ plants respond to higher temperature with enhanced photosynthesis, while C₄ plants have a much lower temperature optimum.

(4) Tomato is a greenhouse crop, which can be grown in a CO₂-enriched atmosphere for higher yield. 

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

(1) C₄

(2) CAM

(3) Nitrogen-fixer

(4) C₃

In a chloroplast the highest number of protons are found in

1. lumen of thylakoids

2. inter membrane space

3. antenna complex

4. Stroma

In photosynthesis, the light-independent reactions take place at 

1. thylakoid lumen 

2. photosystem l

3. photosystem ll

4. stromal matrix