TREE IDENTIFICATION
IDENTIFICATION KEYS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Xylem carries materials in which direction?
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up only
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down only
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both up and down
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sideways
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Explanation:
Detailed explanation-1: -Xylem conducts minerals and water only in the upward direction i.e. from the roots towards the stem. The phloem transports food material from leaves to other parts of the plant body. It can conduct food in both directions.
Detailed explanation-2: -There are two main reasons due to which the xylem is unidirectional, namely positive root pressure and transpiration pull. Positive root pressure means it is against the gravitational pull, and the transpiration pull acts as a suction pump for the xylem tube. Thus, the water rises upwards.
Detailed explanation-3: -Flow in Xylem is unidirectional while in Phloem is bidirectional.
There is 1 question to complete.