(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) Nucellus                 (vi) Synergids

(b) What is double fertilization in Angiosperms? Why is it so called?                     5 mark

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