Assertion: A typical microsporangium of angiosperms is generally surrounded by six wall layers.
Reason: The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

Assertion is false but reason is true.

A typical microsporangium consists of two parts, the outer wall and the central homogeneous sporogenous tissue. The outer wall is made up of four layers: the epidermis, the endothecium, the middle layers, and the tapetum.

The epidermis is the outermost layer of the microsporangium. It is a single layer of cells that protects the microsporangium from the environment.

The endothecium is the second layer of the microsporangium. It is a single layer of cells that is responsible for the dehiscence of the anther. The endothecium cells have thickened walls that form fibrous bands. When the anther matures, these bands dry out and contract, which causes the anther to split open and release the pollen.

The middle layers are the third layer of the microsporangium. They are usually one or two layers of cells that are involved in the storage of nutrients for the developing pollen grains.

The tapetum is the innermost layer of the microsporangium. It is a layer of cells that surrounds the sporogenous tissue and provides nutrients to the developing pollen grains. The tapetum cells are also involved in the release of pollen from the anther.

The sporogenous tissue is the central part of the microsporangium. It is a mass of cells that divide to form the pollen grains. The pollen grains are the male gametes of the plant.