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Q.
When temperature is increased from minimum to optimum, rate of photosynthesis doubles for every _____ rise in temperature.
Photosynthesis in Higher Plants
Solution:
Rate of photosynthesis usually increases with an increase in temperature upto $40^\circ C$. Above this temperature, rate of photosynthesis starts decreasing due to inactivation of enzymes. The minimum temperature at which most plants start photosynthesis is $0^\circ$ to $5 ^\circ$ but it can be as low as $-20^\circ C$ for lichens and$-35^\circ C$ for some gymnosperms. The maximum temperature at which photosynthesis can occur is $55^\circ C$in some desert plants and $75^\circ C$ for hot spring algae. When temperature is increased from minimum to optimum, the rate of photosynthesis doubles for every $10^\circ C$ rise in temperature.