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

The process which makes a major difference between C₃ and C₄ plants is:

Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in:
1. C₄ plants
2. C₂ plants
3. C₃ and C₄ plants
4. C₃ plants

Water-soluble pigments found in plant cell vacuoles are:

In photosynthesis, the light-independent reactions take place at?

1. Thylakoid lumen

2. photosystem I

3. photosystem II

4. Stromal matrix

A process that makes an important difference between C₃ and C₄ plants is:

1. Transpiration

2. Glycolysis

3. Photosynthesis

4. Photorespiration