Biology Topic Practice

Temperature and Photosynthesis

Photosynthesis is controlled by enzymes, making temperature a critical limiting factor.

Why does the rate of photosynthesis drop to zero if it gets too hot?

What is Temperature and Photosynthesis?

"Temperature is a limiting factor in photosynthesis because it affects the kinetic energy and stability of the enzymes involved."

Question 1

Why does the rate of photosynthesis decrease if temperature becomes too high?

Question 2

Why does the rate of photosynthesis decrease if temperature becomes too high?

Question 3

Choose the best explanation: why does the rate of photosynthesis decrease if temperature becomes too high?

Temperature Impact

As temperature increases, the rate increases as enzymes work faster.

The optimum temperature is usually around 25-35°C for most plants.

Above 45°C, the enzymes denature and photosynthesis stops.

Exam Tip

Be careful! If temperature is too low, the rate is limited by slow molecular movement, not denaturation.

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