Multiple Choice
Gas exchange in the lungs is facilitated by:
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40. Circulatory System
Gas Exchange
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Which structures in plant leaves are responsible for allowing gas exchange with the environment?
A
Phloem
B
Stomata
C
Xylem
D
Cuticle
Verified step by step guidance1
Understand the function of each structure listed in the problem: Phloem, Xylem, Cuticle, and Stomata. Phloem is responsible for transporting sugars, Xylem transports water, Cuticle is a waxy layer that prevents water loss, and Stomata are openings that allow gas exchange.
Recall that gas exchange in plants involves the movement of carbon dioxide (CO₂) into the leaf for photosynthesis and the release of oxygen (O₂) as a byproduct.
Identify the structure that facilitates this gas exchange. Stomata are small openings on the surface of leaves, typically surrounded by guard cells, which regulate their opening and closing.
Consider the role of guard cells in controlling the stomata. Guard cells respond to environmental conditions (e.g., light, humidity) to open or close the stomata, ensuring efficient gas exchange while minimizing water loss.
Conclude that the correct structure responsible for gas exchange in plant leaves is the stomata, as they directly allow the movement of gases between the leaf and the environment.
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