Why are angiosperm anthers called dithecous ? Describe the structure of its microsporangium.

Describe the structure of angiospermous embryo sac.

A typical angiosperm anther is:

Why anther is called as tetrasporangiate structure?

(a) Draw a labelled diagram of matured embryo of a dicotyledonous plant. (b) Describe the structure of a matured microsporangium of an angiosperm.

Saprophytic angiosperms are also called

(a) Draw a diagrammatic sketch of a transverse section of an anther of an angiosperm . Label its different walls and the tissue forming microspore mother cells. (b) Describe the process of microsporogenesis upto the formation of a microspore. (c) Write the function of 'germ pore' in a pollen grain of an angiosperm.

Explain the structure of typical angiospermic ovule.

Describe the structure of female gametophyte of an angiosperm .