FBISE, NCP & NBF-aligned resources for Classes 9–12
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Biology Chapter 8 : Topic 11
Gaseous Exchange in Plants
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Gaseous exchange in plants involves the movement of:
Reasoning: Plants exchange oxygen and carbon dioxide with the environment.
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The process of gaseous exchange in plants mainly occurs through:
Reasoning: Stomata are tiny pores that allow gas exchange.
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During photosynthesis, plants mainly take in:
Reasoning: Carbon dioxide is used to manufacture glucose.
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During photosynthesis, plants release:
Reasoning: Oxygen is produced as a by-product of photosynthesis.
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During respiration, plants take in:
Reasoning: Oxygen is required for aerobic respiration.
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During respiration, plants release:
Reasoning: Carbon dioxide is produced during respiration.
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The opening and closing of stomata are controlled by:
Reasoning: Guard cells regulate stomatal pores.
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Gas exchange in plants occurs mainly by:
Reasoning: Gases move from higher concentration to lower concentration.
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Which statement is correct during daytime?
Reasoning: Plants respire continuously, while photosynthesis occurs in light.
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In woody stems, gaseous exchange occurs mainly through:
Reasoning: Lenticels are openings in woody stems for gas exchange.
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Roots exchange gases with the air present in:
Reasoning: Air spaces between soil particles provide oxygen to roots.
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At night, photosynthesis stops but respiration continues. Therefore, plants mainly:
Reasoning: Respiration continues throughout day and night.
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Why is diffusion suitable for gaseous exchange in plants?
Reasoning: Large intercellular spaces facilitate diffusion.
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Which structure directly allows carbon dioxide to enter a leaf?
Reasoning: Carbon dioxide enters through stomatal pores.
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Which pair correctly matches the process with gas exchange?
Reasoning: Photosynthesis uses CO² and releases O².
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