Question

Match the wall components with the type of tissues/ tissue system listed. Choose the answer which gives the correct combination of alphabets.

	List I		List II
A	Suberin	1	Sclerenchyma
B	Lignin	2	Collenchyma
C	Pectin	3	Epidermis
D	Cutin	4	Phellem

• A. A- 4, B- 1, C- 2, D- 3
• B. A- 1, B- 4, C- 2, D- 3
• C. A- 4, B- 2, C- 1, D- 3
• D. A- 4, B- 1, C- 3, D- 2

Answer 1

The correct option is A A- 4, B- 1, C- 2, D- 3

• Suberin is found in the phellem layer of the periderm (or cork). It is the outermost layer of the bark. The cells in this layer are dead and abundant in suberin, preventing water loss from the tissues below.
• Mature sclerenchyma cells are dead cells that have thickened walls containing lignin. Such cells occur in many different shapes and sizes, but two main types occur- fibres and sclereids.
• Collenchyma is strengthened by pectin. So the cell wall is thickened unevenly. The collenchyma cell wall is composed of a primary wall made up of cellulose and at certain places, it is deposited within a secondary wall made up of hemicellulose or pectin.
• In some higher plants, the cuticle is a water-impervious protective layer covering the epidermal cells of leaves and other parts and limiting water loss. It consists of cutin, a waxy, water-repellent substance allied to suberin, which is found in the cell walls of cork tissue.

So, the correct answer is option A.