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(a) Draw the longitudinal section of a f...

(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 ?

Text Solution

Verified by Experts

(a) See Q.29, Set-II.., Outside Delhi-2014 (Comptt.) [Page-245].
(b) The second male gamete moves towards the polar nuclei in the central cell and fuses with them the produce a triploid primary endosperm nucleous. Since syngamy and triple fusion occur in the embryo sec. The process is called double fertilisation.
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