Xylem fibres posses obliterated central lumen due to very thick walls. This helps to perform the function of

Some beverage glasses are made with very thick walls. Why ?

The central lumens are obliterated in

The central lumens are obliterated in

Assertion : A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tepetum. Reason : The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

Assertion : A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tepetum. Reason : The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

Assertion : A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tepetum. Reson : The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

Assertion : A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tepetum. Reason : The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

_____are the robots scaled down to microscopic size in order to put them into very small spaces to perform a function.