PLANTS
PLANT TISSUE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Perforated living cells that conduct food
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Perforated dead cells that conduct food
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Perforated living cells that conduct water
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Perforated dead cells that conduct water
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Detailed explanation-1: -Sieve tubes are elongated tubular conducting channels of phloem. Each sieve tube is formed of several cells called sieve tube members, sieve tube cells or sieve elements. Sieve tube members are placed end to end. Their end walls have many small pores or sieve pits.
Detailed explanation-2: -Sieve elements are thin-walled cells that are alive at maturity, although the protoplast is greatly changed, and they generally lack nuclei. Sieve elements are elongated and function as the basic photosynthate-conducting cell type in the phloem of vascular plants.
Detailed explanation-3: -EXPLANATION: The phloem parenchyma cells transport the soluble organic compounds made during photosynthesis. This transport process is known as translocation. Thus the cells that are associated with sieve tubes and help in the translocation of food are Phloem parenchyma.
Detailed explanation-4: -So, the correct answer is ‘Peripheral cytoplasm, a large vacuole and a prominent nucleus; all are absent in a mature sieve tube element’