Question

The cells that form a major part of walnut shells are

• A. Fibers
• B. Sclereids
• C. Collenchyma
• D. Parenchyma

Answer 1

The correct option is B

Sclereids

The correct option is B:

Explanation of correct option:

1. The cells that form the major part of walnut shells are a type of sclerenchyma cells.
2. The main function of all types of sclerenchyma cells is to strengthen the plants, as it is the main mechanical tissue of the plant.
3. There are two types of sclerenchyma cells - Sclereids and sclerenchyma fibers.
4. Sclereids have highly thick walls and they are generally short cells.
5. They are present in the hard covering of nuts and seeds like the pulp of fruits like guava, pear, and sapota and in walnut and coconut, etc., which provide grittiness to them.

Explanation of incorrect option:

Option A:

1. Fibers are the one type of sclerenchymatous cells. They are narrow, elongated, spindle-shaped cells that have tapering pointed ends.
2. They are sources of natural fibers like hemp, coir, jute, etc.

Option C:

1. The cells of collenchyma tissue are generally living and elongated, and they contain uneven thickening (made up of cellulose and pectin) of the cell wall.
2. They are present below the epidermis in the dicot stem, leaf margin, and leaf stock of dicot leaves.

Option D:

1. Parenchyma cells is living cell which contains thin primary cell walls.
2. They are first evolved permanent tissue or universal tissues with unspecialized cells.
3. They are present throughout the plant body.

Final Answer: Hence, The cells that form a major part of walnut shells are Sclereids