Question:
Light is the signal that controls stomatal movement in plants. The stomatal opening is stimulated by
Light is the signal that controls stomatal movement in plants. The stomatal opening is stimulated by
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Blue light: Stimulates stomatal opening.
Phototropins are the photoreceptors.
Red light: Indirect effect via photosynthesis (CO2 reduction).
Phototropins are the photoreceptors.
Red light: Indirect effect via photosynthesis (CO2 reduction).
Updated On: Sep 1, 2026
- Red light
- Blue light
- Green light
- Yellow light
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of stomatal movement regulation.
Step 2: Detailed Explanation:
Blue light stimulates stomatal opening.
Phototropins (blue-light photoreceptors) mediate this response.
Blue light activates proton pumps, leading to K+ uptake and stomatal opening.
Red light (A): Influences photosynthesis but not directly stomatal opening.
Green light (C): Not effective for stomatal opening.
Yellow light (D): Not effective.
Thus, blue light stimulates stomatal opening.
Step 3: Final Answer:
Thus, blue light stimulates stomatal opening, which corresponds to option (B).
[0.5cm]
This question tests knowledge of stomatal movement regulation.
Step 2: Detailed Explanation:
Blue light stimulates stomatal opening.
Phototropins (blue-light photoreceptors) mediate this response.
Blue light activates proton pumps, leading to K+ uptake and stomatal opening.
Red light (A): Influences photosynthesis but not directly stomatal opening.
Green light (C): Not effective for stomatal opening.
Yellow light (D): Not effective.
Thus, blue light stimulates stomatal opening.
Step 3: Final Answer:
Thus, blue light stimulates stomatal opening, which corresponds to option (B).
[0.5cm]
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