Sieve tubes differ from tracheids in:

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(B) Sieve tubes are components of the phloem tissue,which are living cells at maturity,although they lack a nucleus. Tracheids are components of the x

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Less deposition of lignin

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(B) Sieve tubes are components of the phloem tissue,which are living cells at maturity,although they lack a nucleus. Tracheids are components of the xylem tissue,which are dead cells at maturity due to heavy lignification of their cell walls. The primary difference between them is that sieve tubes are living cells with thin cellulose walls,whereas tracheids are dead cells with thick,lignified walls. Therefore,the lack of heavy lignin deposition in sieve tubes distinguishes them from tracheids.

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