Observe the diagram and answer the question.

Arrange the following wall layers of microsporangium in order starting from inside to outside:

(A) Middle layer
(B) Tapetum
(C) Endothecium
(D) Sporogenous tissue

Choose the correct answer from the options given below:

(D), (B), (A), (C)

The correct answer is Option (3) → (D), (B), (A), (C)

A typical microsporangium appears near circular in outline. It is generally surrounded by four wall layers – the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. When the anther is young, a group of compactly arranged homogenous cells called the sporogenous tissue occupies the centre of each microsporangium.