Stoma, found in the epidermis of leaves closes when guard cells
Correct answer: B. Lose Water
- A. Gain Water
- B. Lose Water
- C. Exchange gas
- D. None of These
Explanation
Guard cells lose water, become flaccid and reduce the stomatal pore, causing the stoma to close. When guard cells gain water they become turgid and usually open the pore, so “gain water” is the likely distractor.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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