Multiple choice

In C4 plants the stomata is open during the...?

  1. 24/7

  2. Day and night

  3. Night

  4. The day
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Unlike CAM plants, which open their stomata at night to minimize water loss, C4 plants keep their stomata open during the day to capture carbon dioxide. They minimize photorespiration by physically separating initial carbon fixation and the Calvin cycle in different cell types.

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