How many of the following elements of vascular tissues in flowering plants lack protoplasm at maturity?
$\begin{matrix} Vessel, Tracheid, Sieve tube, Bast fibre, Xylem fibre. \end{matrix}$

Two

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Four

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Three

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Five

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Solution

The correct option is B Four
Answer (3)
A mature sieve tube element possesses a peripheral cytoplasm and a large central vacuole but lack nucleus.

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The water conducting tissue generally present in gymnosperm is

(a) vessel (b) sieve tube (c) tracheids (d) xylem fibres

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