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Which one of the following statements pertaining to plant structure is correct?

1. cork lacks stomata but lenticels carry out transpiration.
2. Passage cells help in transfer of food from cortex to phloem
3. Sieve tube elements possess cytoplasm but no nuclei
4. The shoot apical meristem has a quiescent centre.

Correct answer: Sieve tube elements possess cytoplasm but no nuclei

Solution

Sieve tube elements are living phloem cells that retain a thin layer of cytoplasm but lose their nucleus at maturity to allow efficient transport. This makes option C correct; the other statements describe different structures or are inaccurate.

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