A) Cork lacks stomata but lenticels carry out transpiration
B) Passage cells help in transfer of food from cortex to phloem
C) Sieve tube elements possess cytoplasm but no nuclei
D) The shoot apical meristem has a quiescent centre
Correct Answer: C
Solution :
Sieve-tube elements are living cells that form phloem tubes for the transport of sucrose and other organic nutrients. These are alive at functional maturity, although their protoplasts lack nucleus, ribosomes and a distinct vacuole. Alongside each sieve tube element is at least one companion cell which is connected to the sieve tube by numerous plasmodesmata. The nucleus and ribosomes of companion cell also serve for sieve tube element.
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