SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which direction does the phloem transport materials?
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Up the plant at night and down the plant during the day
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Up and down the plant all the time
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Up the plant only
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Down the plant only
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Explanation:
Detailed explanation-1: -The direction of movements in phloem is bidirectional and that of xylem is unidirectional. Since the source –sink relationship is variable, the direction of movement in the phloem can be upwards or downwards, i.e., bidirectional.
Detailed explanation-2: -Phloem transport is bidirectional because sucrose gets accumulated in the phloem tissue and absorbs water creating a high turgor pressure.
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