CBSE Class 12-science Answered
(a) Draw the embryo sac of a flowering plant and
label:
(i) Central cell.
(ii) Chalazal end.
(iii) Synergids.
(b) Name the cell that develops into an embryo sac
and explain how this cell leads to the formation of embryo sac.
(c) Mention the role played by the various cells of the
embryo sac.
(d) Give the role of filiform apparatus.
Asked by Topperlearning User | 12 Jun, 2014, 10:07: AM
Expert Answer
(a) Embryo sac of a flowering plant.
(b) Functional megaspore.
The nucleus of the functional megaspore divides mitotically to form two nuclei which move to opposite poles and form the 2-nucleate embryo sac.
(c) Egg: Fuses with the male gamete to form zygote or the future embryo.
Synergid: Absorption of nutrients, attracts and guides the pollen tube.
Central cell: After fusion with the second male gamete, it forms the primary endosperm cell which gives rise to the endosperm.
(d) The filiform apparatus guides the entry of pollen tube into the embryo sac.
Answered by | 12 Jun, 2014, 12:07: PM
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