With the help of labelled diagrams, depict the stages of a microspore maturing into a pollen grain.

pollen grains

Exine of pollen grain

What is pollen grain

With the help of labelled diagrams show the mechanism of beathing in humans.

Larger nucleus in a pollen grain is

Diameter of pollen grain is

Study of pollen grains is

a) Why does endosperm development precede development in angiosperm seeds? State the role of endosperm in mature albuminous seeds. b) Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.

Generative cell of pollen grain

Draw a labelled diagram of the T.S. of a mature anther.