Question

The correct sequence of different layers from interior to exterior of a mature plant cell is

Answer 1

Answer:

Corona radiata is the layer placed adjacent to the zona pellucida. It provides proteins to the developing ovum. It is made up of tall pillar-like cells.

Zona pellucida is a glycoprotein layer. It is paced outer to the plasma membrane of the oocytes. It binds to spermatozoa, and initiate the acrosome reaction.

The vitelline membrane surrounds the outer surface of the plasma membrane and it helps in the binding of spermatozoa.

Explanation:

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Answer 2

The different layers from the interior to the exterior of a mature plant cell are the secondary cell wall,  primary cell wall and middle lamella.

Explanation:

• A plant cell wall is arranged in layers and contains cellulose microfibrils, hemicellulose, pectin, lignin, and soluble protein.

• These components are organized into three major layers: the secondary cell wall, the primary cell wall and the middle lamella.

• The secondary walls are mainly composed of cellulose, hemicelluloses (xylan and glucomannan) and lignin. It is deposited in some specialized cells, such as tracheary elements, fibers and other sclerenchymatous cells.

• The primary wall is the cellulose-containing layer laid down by cells that are dividing and growing.

• The middle lamella is a layer that cements together the primary cell walls of two adjoining plant cells.

• The middle lamella is made up of calcium and magnesium pectates. In a mature plant cell, it is the outermost layer of the cell wall.