Carbon dioxide is the major limiting factor for photosynthesis. With respect to this, choose the correct statement from the following.

Question

Carbon dioxide is the major limiting factor for photosynthesis. With respect to this, choose the correct statement from the following. (A) Crops like tomato and bell pepper use increased levels of CO2 for higher productivity and are hence called greenhouse crops. (B) The current availability of CO2 levels is limiting to C4 plants. (C) C4 plants show saturation at about 450 µlL-1 while C3 responds to increased CO2 concentration and saturation is seen only beyond 360 µlL-1. (D) Increase in concentration up to 0.03 per cent can cause an increase in CO2 fixation rates.

Tardigrade Admin · Accepted Answer

The fact that C3 plants respond to higher CO2 concentration by showing increased rates of photosynthesis leading to higher productivity has been used for some greenhouse crops such as tomatoes and bell pepper. They are allowed to grow in a carbon dioxide enriched atmosphere that leads to higher yields. The current availability of CO2 levels is limiting to C3 plants. C4 plants show saturation at about 360 µlL-1 while C3 responds to increased CO2 concentration and saturation is seen only beyond 450 µlL-1. Increase in concentration up to 0.05 per cent can cause an increase in CO2 fixation rates.

Q. Carbon dioxide is the major limiting factor for photosynthesis. With respect to this, choose the correct statement from the following.

Crops like tomato and bell pepper use increased levels of CO₂ for higher productivity and are hence called greenhouse crops.

The current availability of CO₂ levels is limiting to C₄ plants.

C₄ plants show saturation at about 450 µlL^-1 while C₃ responds to increased CO₂ concentration and saturation is seen only beyond 360 µlL^-1.

Increase in concentration up to 0.03 per cent can cause an increase in CO₂ fixation rates.