Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
Reason (R): Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells.
In the light of the above statements, choose the most appropriate answer from the options given below:

The correct answer is Both A and R are true and R is the correct explanation of A

Concept:

Structure of microsporangium:

• In a transverse section, 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.

Explanation:

Assertion (A): "Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus" is true.

• The tapetal cells have dense cytoplasm and are often multinucleate, which is a characteristic feature of these cells to support their high metabolic activity.

Reason (R): "Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells" is also true.

• The multinucleate nature of tapetal cells enhances their ability to produce and secrete substances required for the nourishment of developing microspores.

The Reason (R) directly explains why the Assertion (A) is true