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Biology Chapter 8 : Topic 7
Transpiration and Stomatal Regulation
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Transpiration is the:
Reasoning: Transpiration is the loss of water vapour mainly through leaves.
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Most transpiration occurs through:
Reasoning: Stomata are the main sites of water loss in plants.
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Stomata are found mainly on the:
Reasoning: Most stomata are present on leaf surfaces.
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The opening and closing of stomata are controlled by:
Reasoning: Guard cells regulate the size of the stomatal pore.
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When guard cells become turgid, stomata:
Reasoning: Turgid guard cells bend outward, opening the stomatal pore.
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When guard cells lose water and become flaccid, stomata:
Reasoning: Flaccid guard cells cause the stomatal pore to close.
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Which condition generally increases transpiration?
Reasoning: Open stomata allow more water vapour to escape.
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The primary function of transpiration is to:
Reasoning: Transpiration creates a pull that helps move water upward.
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Which leaf surface usually has more stomata in terrestrial plants?
Reasoning: More stomata are generally present on the lower surface to reduce water loss.
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What directly escapes from stomata during transpiration?
Reasoning: Water leaves the leaf as water vapour.
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Which factor is most directly responsible for stomatal opening?
Reasoning: Increased turgidity of guard cells opens the stomata.
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If stomata remain closed for a long period, transpiration will:
Reasoning: Closed stomata greatly reduce water loss.
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Which structure provides the largest surface area for transpiration?
Reasoning: Broad leaves expose a large surface area for evaporation.
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A plant wilts because guard cells lose water and become:
Reasoning: Loss of water reduces turgor pressure in guard cells.
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Which statement correctly relates stomata to transpiration?
Reasoning: Water vapour escapes more readily when stomata are open.
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