First slide

Factors affecting Photosynthesis

Question

Current availability of ${CO}_{2}$ levels in atmosphere is limiting for photosynthesis in:

Easy

A

Sorghum
B

Maize
C

Sugarcane
D

Tomato

Solution

$C_{4}$ plants show carbon dioxide saturation at about 360 $µ {lL}^{- 1}$ while $C_{3}$ responds to increased ${CO}_{2}$ concentration and saturation is seen only beyond 450 $µ {lL}^{- 1}$ . Thus, current availability of ${CO}_{2}$ levels is limiting for photosynthesis in $C_{3}$ plants. Tomato is a $C_{3}$ plant while Sorghum, maize and sugarcane are $C_{4}$ plants.

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