Name the organic material of exine and intine of an angiospermic pollen grain. Mention their role.

Write a short note on pollen grain in an angiospermic plant.

Name the organs which play role in circulation of blood?

Name the secretion of alpha and beta cells of the islets of Langerhans.Mention of the role of these ecretions.

Explain the role of tapetum in the formation of pollen-grain wall.

Short Answer Questions Draw a labelled diagram of the sectional view of a mature pollen grain of angiosperm. Explain the function of any two parts.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : Draw a neat, labelled diagram of a mature angiosperm, embryo sac. Mention the role of synergids.

Name the part of gynoecium that determines the compatible nature of pollen grain.

Write the scieintific names of causal organisms of elephantiasis and ringworm in humans. Mention the body parts affect by them.