Choose the statement below that is true. Photosynthetic enzymes are denatured at high temperatures. Increasing temperature always increases the rate of photosynthesis. Too much carbon dioxide is toxic for plants. The main limiting factors are temperature, light intensity and oxygen concentration.

The correct answer would be -

Photosynthetic enzymes are denatured at high temperatures

Too much carbon dioxide is toxic for plants

Explanation:

Temperature is a limiting factor for the rate of photosynthesis due to the fact the at high-temperature photosynthesis is affected as initially with an increase in temperature rate of photosynthesis but after a limit, it becomes constant and increasing above that will result in denaturing of the photosynthetic enzymes.

CO2 is also a limiting factor that limits the photosynthetic rate if too little or affects the photosynthesis in the too much amount by denying the O2 intake by soil and make leaves thick.

b would be the right answer