Enzymes controlling metabolism in mature sieve tubes are formed on instructions from DNA of

Albuminous cells

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Companion cells

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Subsidiary cells

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Phloem parenchyma

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Solution

The correct option is B Companion cells
The companion cells are the specialised parenchymatous cells present alongside the sieve-tube elements in the phloem of the angiosperms. The sieve-tube elements lack cytoplasm and the nucleus at maturity and so, the metabolic control occurs through the nucleus of the companion cells. Phloem parenchyma performs the function of storage. Subsidiary cells occur in the epidermis of the leaves.
Hence, the correct answer is 'Companion cells'

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