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  1. An organised and differentiated cellular structure having cytoplasm but no nucleus is
    1. Vessels
    2. Xylem parenchyma
    3. Sieve tubes
    4. Tracheids
Correct Option: C

Internally, sieve tubes possess peripheral layer of cytoplasm and are devoid of nucleus. They are living cells. Cell walls of sieve tubes are thickened than surrounding parenchyma cells.



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