Practice question · True or false
The waxy cuticle covering a leaf is perforated by stomata.
Hints
- A perfect waterproof barrier would create a second problem.
- Carbon dioxide must still get in, so the barrier needs controllable openings.
Show the answer
True
Why
True, a perfectly sealed leaf would not lose water but would also starve, since CO₂ could not enter. Stomata are the compromise: a controllable breach in the barrier, opened only when the exchange is worth the water.
Practise Plant Meristems and Covering Tissues
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