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Question

The outer wall of epidermis in stems and leaves has a waxy covering made up of


A
Lignin
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B
Suberin
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C
Pectin
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D
Cutin
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Solution

The correct option is D Cutin
Lignin is the organic component of the plant cells, fibers and vessels. Lignin fills the spaces in cell wall between cellulose, hemicellulose and pectin compounds. It is present in all dry land plant cell walls. Cork cells are dead and have cell walls composed of a waxy substance "suberin", which is highly impermeable to gases and water. This substance prevents the water loss from the stem. Pectin is a biopolymer present in primary cell walls of all land plants. Particularly it is present in cell walls of nonwoody plants. Cutin is a waxy, water repellant substance, which covers all aerial surfaces of the plant including stem leaves, fruits, etc. It prevents water loss from the plant body. Therefore, option D is correct. 

Biology

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