Question

The total carbon dioxide fixation done by the C4 plants is _________

(a) 3%

(b) 13%

(c) 23%

(d) 33%

I had been asked this question in a job interview.

My question is taken from Chloroplast Function in portion Chloroplast Structure and Function of Cell Biology

Answer 1

Right answer is (c) 23%

For explanation I would say: They are more efficient than C3 plants in the carbon dioxide fixation in the atmosphere. They usually grow in higher temperature regions where the activity of the enzyme RuBisCO is high.