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UPSC Prelims 1981 · Agriculture · Crops and Where They Grow
Which of the following crops has the highest photosynthetic activity?
- (a) Cotton
- (b) Sugarcane
- (c) Rice
- (d) Wheat
Show the answer and explanation
Answer: (b) Sugarcane
Sugarcane uses the efficient C₄ pathway and has among the highest photosynthetic rates of any crop.
Why the others are wrong
(a) Cotton is a C₃ plant.
(c) Rice is C₃.
(d) Wheat is C₃.
The trap
None.
🔒 C₄ crops: sugarcane, maize, sorghum, bajra — more efficient in heat and light.
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