Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only.)
The optimum temperature for photosynthesis is:
Topic: Optimum temperature for photosynthesis
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Answer
(d) 25 – 35°C.
The optimum range is 25–35°C.
THE REASON, which lets you work it out rather than memorise it: photosynthesis is controlled by ENZYMES, and enzymes are proteins. Between 25 and 35°C they work fastest. Below that the reactions slow down; above about 40°C the enzymes begin to DENATURE and the rate falls sharply, stopping altogether well before 60°C.
That single fact eliminates (B) and (C) at once — no enzyme-driven process in a plant works at 60°C.
Note that temperature is one of the four external factors affecting photosynthesis, along with light intensity, carbon dioxide concentration and water. In Blackman’s law of limiting factors, the rate is set by whichever of these is in shortest supply.
25 – 35°C.