First slide

Factors affecting Photosynthesis

Question

Present ${CO}_{2}$ concentration in atmosphere is limiting for:

Easy

A

Maize
B

Sorghum
C

Tomato
D

Sugarcane

Solution

$C_{4}$ plants show saturation at about 360 µlL^-1 while $C_{3}$ responds to increased ${CO}_{2}$ concentration and saturation is seen only beyond 450 µlL^-1. Thus, current availability of ${CO}_{2}$ levels is limiting to the $C_{3}$ plants. Maize, sorghum and sugarcane are $C_{4}$ plants while tomato is a $C_{3}$ plant.

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