Draw a T.S. of a young anther of an angiosperm Label the different layers of the wall and write their funtions.

(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.

The innermost wall layer of anther

A.T.S. of dithecous anther shows

Draw a neat, labelled diagram showing different layers of the Earth's atmosphere.

Write a note on different types of endosperms in angiosperms.

(a) Draw a labelled schematic diagram of the transverse section of a mature anther of an angiosperm plant. (b) Describe the characteristic features of an insect pollinated flower.

In the T.S. of a mature anther given below, identify 'A' and 'B' and mention their function.