which one of the following carries substances upward as well as downwards in a plant 1 xylem fibre 2 pholem parenchyma 3 pholem tube 4 companion cells
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The answer to this one is sieve tube (3) which is the major conducting element of phloem.
Xylem does only unidirectional conduction. Phloem parenchyma, though a part of phloem, is typically for storage of waste substances. Companion cells maintain pressure gradient in the sieve tubes of phloem but the sieve tube only performs the translocation.
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पमर्ल्रेररैरेपव्पि्कक्काग््ापिपिर्
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