Practice question
Question
Guard cells are specialized epidermal cells that control:
Explanation
The right choice is C: Stomatal aperture. In STOMATA MOVEMENT, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Transpiration only; B) Gas exchange only; D) Photosynthesis rate. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
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