Question

Identify A to E in the following diagram.

• A. A - Tapetum, B - Microspore mother cell, C - Middle layers, D - Endothecium, E - Epidermis
• B. A - Epidermis, B - Middle layers, C - Microspore mother cell, D - Tapetum, E - Endothecium
• C. A - Middle layers, B - Epidermis, C - Tapetum, D - Microspore mother cell, E - Endothecium
• D. A - Epidermis, B - Endothecium, C - Middle layers, D - Microspore mother cell, E - Tapetum

Answer 1

The correct option is D A - Epidermis, B - Endothecium, C - Middle layers, D - Microspore mother cell, E - Tapetum

Microsporangium is mainly surrounded by four layers/walls, 𝑖.𝑒., epidermis, endothecium, middle layers and tapetum.
(i) Epidermis, endothecium and middle layers are the outer three layers and help in protection and dehiscence of anther to liberate pollen.
(ii) Tapetum is the innermost layer that possesses dense cytoplasm and is in the multinucleate stage and nourishes the developing pollen grain.
(iii) The sporogenous tissue is present in the interior of a microsporangium. Its cells gradually transform into microspore or pollen mother cells. These undergo meiosis and maturation to form pollen grains.

The figure of microsporangium is shown below: