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Describe longitudinal section of a pist...

Describe longitudinal section of a pistil showing pollen germination. Explain the events in the embryo sac during the process of fertilisation. Which resulting stages give rise to the embryo and the endosperm respectively?

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a) Draw a L.S. of a pistil showing pollen tube entering the embryo-sac in an angiosperm and label any six parts other than stigma, and ovary. b) Write the changes a fertilized ovule undergoes within the ovary in an angiosperm plant.

Draw a longitudinal section of the pistil from a flowering plant, where pollination has occurred. Label the following: (a) Stigma showing germinating pollen grains (b) Style (c) Pollen tube reaching the micropyle of the ovule (d) Embryo sac (e) Components of the egg apparatus

(a) Draw the longitudinal section of a flower showing growth of pollen tube upto the embryo sac.Label the following parts : (i) Stigma (ii) Pollen tube (iii) Integument (iv) Chalazal end (v) Nucelllus (vi) Synergids (b) What is double fertilisation in Angiosperms? Why is it so called ?