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Question

Which of the following is NOT a part of Xylem tissue?

The correct answer is

Sieve tube

Xylem is a complex permanent tissue that conducts water and minerals from the roots to the other parts of the plant. It is made of four kinds of elements: tracheids, vessels, xylem parenchyma and xylem fibres.

Tracheids and vessels are tubular, thick-walled cells that carry water, and xylem fibres give mechanical support, so all three are parts of xylem.

Sieve tubes are elements of phloem, the tissue that transports food prepared in the leaves. Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres. So the sieve tube is not a part of xylem tissue.

Hence, Sieve tube.

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