Question : 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 photosynthe

1.	Question : Carbon dioxide is the major limiting factor for photosynthesis. With respect to this . choose the correct Statement from the following.
Answer» Crops LIKE tomato and bell pepper use increased levels of `CO_2`for higher productivity and are hence called GREENHOUSE crops. The current availability of `CO_2`levels is LIMITING to `C_4`plants . `C_4`plants show saturation at about `450ppm`while `C_3`responds to increased `CO_2`concentration and saturation is SEEN only beyond `360 PPM`. Increase in concentration up to 0.03 per cent can cause an increases in `CO_2` fixation rates. Answer :A