Which of the following statement is correct regarding simple permanent tissue ?

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The collenchyma occurs in layers below the epidermis in monocotyledonous plants.

Sclerenchyma cells are usually dead and without protoplasts.

Xylem parenchyma cells are living and thin walled and their cell walls are made up of lignin.

The companion cells are specialized sclerenchymatous cells.

answer is B.

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Detailed Solution

Sclerenchyma is simple dead supportive tissue with highly thick walled cells composed of cellulose or lignin with little or no protoplasm. Collenchyma are present beneath the epidermis of young stem, petiole and midrib of leaves etc. in dicotyledonous plants. Xylem parenchyma cells are living and this walled, and their cell walls are made up of cellulose. Companion cells are specialized parenchymatous cell, which are closely associated with sieve tube elements.

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