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Which waxy layer covering the leaves of all plant species reduces the rate of water loss?
AThe suberin
BThe mesophyll
CThe trichome
DThe cuticle
Answer & Solution
Correct answer: D. The cuticle
1. A waxy layer covers the leaves of all plant species.
2. That layer is the cuticle, and it reduces the rate of water loss from the leaf surface.
3. Suberin is the waxy substance in cork cells and in the root Casparian strip, not the leaf covering.
4. Mesophyll is the photosynthetic tissue inside the leaf and trichomes are epidermal hairs.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.4 Leaves_
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