PLANTS
TRANSPORT IN PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sieve tube cells are nucleated but devoid of mitochondria and ER
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Companion cells are non-nucleated and regulated by nucleated sieve cell
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Sieve tube cells are present in all plants
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Companion cells are nucleated and regulates activity of non-nucleated sieve tube
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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: -The companion cells, unlike sieve elements, have cytoplasm and a prominent nucleus.
Detailed explanation-3: -A matured sieve cell or sieve tube element lack nucleus. Thus these are enucleated living cells.
Detailed explanation-4: -Sieve tubes are tubular cells with perforated walls. They are living and do not have a nucleus and are the important component of phloem. They help in the transportation of food prepared in the leaves or the other parts of the plant.