alleryStart learning →Which epidermal cells are the only ones to contain chloroplasts?
ATrichome cells
BCork cells
CPalisade cells
DGuard cells
Answer & Solution
Correct answer: D. Guard cells
1. Both mesophyll layers hold many chloroplasts, but the question asks specifically about the epidermis.
2. Guard cells are the only epidermal cells to contain chloroplasts.
3. Two guard cells flank each stoma and control its opening and closing.
4. Palisade cells are the trap, because they are the most chloroplast rich cells in the leaf but belong to the mesophyll, not the epidermis.
5. Trichomes are epidermal hairs and are not credited with chloroplasts.
6. Cork cells form the protective bark of woody stems and are dead at maturity.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.4 Leaves_
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