alleryCacti conserve water by fixing and storing CO2 temporarily at:
ANoon
BDawn
CDusk
DNight
Answer & Solution
Correct answer: D. Night
1. Opening stomata at night loses less water.
2. Cacti store CO2 at night.
3. By day stomata stay closed.
_Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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