Question

Which of the following statements regarding the structure of microsporangium are correct? (i) Microsporangium is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tapetum. (ii) Outer three layers perform functions of protection and dehiscence of anthers. (iii) Cells of tapetum undergo meiosis and produce microspore tetrads.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The Correct Option is A

A microsporangium or future pollen sac is a cylindrical sac which appears circular in transverse section. It consists of two parts, outer wall and central homogeneous sporogenous tissue. Microsporangial wall has four types of layers ?

Answer 2

Ans: Microsporangium is the male reproductive organ of plants that will develop pollen grains. In the microsporangium there are four wall layers, that are: 

Epidermis, endothecium, middle layer and tapetum. 

• Epidermis is  the outermost layer, and protects the structure and also the  loss of water. 
• Endothecium is more than one layer of cells that is found beneath the epidermis. They have a role in opening of the microsporangium so that the pollen can be released. 
• Middle layer is between the endothecium and the innermost layer tapetum. Heps in the development  of the organs. 
• Tapetum is the innermost layer and helps in developing and nourishing the pollen grains. Cells of tapetum do not produce microspore tetrads. 

Therefore, both option i and ii are correct.