Question

*A typical microsporangium is surrounded by four wall layers. Which among these is the innermost layer?*

1️⃣ Epidermis
2️⃣ Endodermis
3️⃣ Endothecium
4️⃣ Tapetum​

Answer 1

Answer:

The anther wall consists of four layers: the epidermis (exothecium), endothecium, middle layer(s) and tapetum. The central region of each microsporangium contains the sporogenous tissue, composed of microspore mother cells (meiocytes), which eventually will form the pollen grains.

Answer 2

A typical microsporangium is surrounded by four wall layers. The innermost layer is 4) Tapetum​.

Microsporangium:

• Microsporangia are sporangia that produce microspores that germinate to form male gametophytes.
• All vascular plants with heterosporic life cycles, such as seed plants, spike mosses, and the aquatic fern genus Azolla, have microsporangia.
• Microsporangium is a structure in the male reproductive organ of plants where pollen develops.
• Angiosperms are plants that produce blooms, which can then generate seeds that are enclosed within a carpel.
• Microsporangium is a structure located in the male reproductive organ that is responsible for the creation and development of pollen grains.

Tapetum​:

• Tapetum is the anther's innermost cell layer that surrounds growing pollen mother cells (PMCs) and/or microspores, delivering nutrients and enzymes needed for microsporogenesis and pollen maturation.
• The tapetum is a specialized layer of nutritive cells present within the anther of flowering plants, between the sporogenous tissue and the anther wall.
• Tapetum is essential for pollen grain nutrition and development, as well as a source of pollen coat precursors.

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