Which of the following is absent in the primary and secondary structure of stem of Pinus?

Sieve tubes

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Mucilage duct

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Companion cells

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Phloem parenchyma

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Solution

The correct option is D Companion cells
Companion cells are found in angiosperms only. In gymnosperms plants, albuminous cells are found in place of companion cells. Sieve cells in gymnosperms are associated with albuminous cells (also called as Strasburger cells), which lack starch. Only angiosperms have companion cells.
Thus, the correct answer is option C.

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