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  4. Companion cells are closely associated with

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Q. Companion cells are closely associated with

AIPMTAIPMT 2012Anatomy of Flowering Plants

Solution:

Companion cell is a thin walled elongated cell which is associated with sieve tube. The sieve tube elements lack nucleus, they remain living, being dependents upon the adjacent companion cell nucleus.
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Phloem is the food conducting tissue of plants, it consists of four type of cell.
(i) Phloem parencyma
(ii) Phloem fibre
(iii) Sieve tube elements
(iv) Companion cell.