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Assertion : Endothecium layer of anther wall plays an important role in dehiscence of anther.

Reason : The presence of fibrous bands and differential expansion of inner and outer tangential walls of endothecial cells cause dehiscence of anther.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Best answer

Correct option (a) Both A and R are true and R is the correct explanation of A

Explanation :

Microsporangial wall has four types of layers-epidermis (common anther covering), endothecium, 1 - 3 middle layers and tapetum. In a typical anther the endothecial cells develop fibrous thickenings of α-cellulose on the inner and radial walls. Because of the presence of fibrous thickenings, the endothecium is also called fibrous layer. The mature anther dries up. The sterile strip present between the two pollen sacs of each anther lobe disintegrates to form a single cavity. With the loss of water the differentially thickened cells of endothecium contract from their outer thin walls. The latter become concave. It brings their outer radial walls nearer. As a result the endothecium shortens and ruptures the anther lobe wall in the region of stomium.

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