What is endothecium?

Give an account of endothecium of anther wall.

Which of the following statements is/are correct ? (i) Endothecium lies below epidermis (ii) Fusion of egg with male gamete is called apogamy (iii) Synergids are haploid. (iv) The point at which funicle touches the ovule is raphe.

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.

Which of the following statements regarding the structure of microsporagium 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 micropore tetrads.

Assertion : The cells of endothecium are hygroscopic in nature. Reason : They absorb water from air.

Endothecium, Tapetum, Epidermis ,Middle layers. These are the parts of anther wall . (a ). Arrange them in an order according to occurrence in the anther wall . (b) What is the function of tapetum ?

Find the odd one out (a ) Endothecium Tapetum , Middle layers , Nucellus (b) Exine , Tube nucleus , Synergids , Generative cell (c) Egg , Intine , Antipodals , Secodary nucleus

What is sternum ? What is its importance ?