Exercise
Form 4: Mechanism of Transpiration and Water Movement
Examine the mechanisms driving transpiration and continuous water movement through a plant. Learn how water loss at the leaves creates tension to pull water upward.
Questions
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MultiChoice
What is the main driving force behind the transpiration stream?
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MultiChoice
Through which leaf structures does most water vapor escape during transpiration?
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MultiChoice
What term describes the continuous column of water moving from roots to leaves?
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MultiChoice
How does evaporation at the leaf surface create tension in xylem?
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MultiChoice
Cohesion-tension theory explains the transport of water in which tissue?
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MultiChoice
What property allows water columns to resist breaking under tension in xylem?
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MultiChoice
What process supplies root cells with the energy needed for active transport of minerals?
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MultiChoice
Accumulation of mineral ions in root cells causes water to enter roots by osmosis, generating what force?
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MultiChoice
What effect does root pressure have on water in small plants at night?
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MultiChoice
How does water travel across the root cortex to reach xylem vessels?
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MultiChoice
Why is transpiration sometimes called an 'unavoidable evil' for plants?
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MultiChoice
What beneficial effect does transpiration have on leaf temperature?