Multiple Choice
What structures allow water vapor to escape the leaves of a plant?
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9. Photosynthesis
Leaf & Chloroplast Anatomy
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What is the primary purpose of the waxy cuticle on a plant’s leaf?
A
To provide structural support to the leaf
B
To facilitate gas exchange by allowing carbon dioxide to enter
C
To increase the absorption of sunlight for photosynthesis
D
To reduce water loss by acting as a barrier to evaporation
Verified step by step guidance1
Understand the function of the waxy cuticle: The waxy cuticle is a hydrophobic layer that covers the surface of plant leaves, stems, and other aerial parts. Its primary role is to minimize water loss by preventing evaporation.
Recognize the importance of water conservation in plants: Plants lose water through a process called transpiration. The waxy cuticle acts as a barrier to reduce excessive water loss, especially in dry or hot environments.
Differentiate the waxy cuticle's role from other leaf structures: While the waxy cuticle reduces water loss, other structures like stomata facilitate gas exchange, and chloroplasts are responsible for absorbing sunlight for photosynthesis.
Eliminate incorrect options: Structural support is provided by the cell wall and vascular tissues, not the waxy cuticle. Gas exchange is facilitated by stomata, not the cuticle. Sunlight absorption is primarily the role of chlorophyll in chloroplasts, not the cuticle.
Conclude the correct purpose: The waxy cuticle's primary function is to reduce water loss by acting as a barrier to evaporation, ensuring the plant retains sufficient moisture for survival and physiological processes.
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