OBJECTIVE LIFE SCIENCE
PLANT PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the xylem in a young tree is damaged, which process is first affected?
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performing photosynthesis
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transporting sugar to the roots
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transporting water to the leaves
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absorbing water from the soil
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Explanation:
Detailed explanation-1: -The tree must first start performing photosynthesis in order to make up for the lost nutrients.
Detailed explanation-2: -Transpiration is ultimately the main driver of water movement in xylem. The cohesion-tension model works like this: Transpiration (evaporation) occurs because stomata are open to allow gas exchange for photosynthesis.
Detailed explanation-3: -The cohesion – tension theory of sap ascent explains how how water is pulled up from the roots to the top of the plant. Evaporation from mesophyll cells in the leaves produces a negative water potential gradient that causes water and minerals to move upwards from the roots through the xylem.
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