Question

discuss about the development of female spore in flowering plant

Answer 1

Spores undergo cell proliferation and differentiation to develop into gametophytes. The major function of gametophyte generation is to produce haploid gametes. ... The female gametophyte, also referred to as the embryo sac or megagametophyte, develops within the ovule, which is found within the carpel's ovary.

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Answer 2

Plants undergo two phases of reproduction in their life cycle gametophyte and sporophyte. Gametophyte (production of haploid gametes) is the dominant occurrence among angiosperms (flowering plants).

Among angiosperms gametophyte is the dominant phase of reproduction. Gametophyte is the mode through which the plant produces haploid male and female gametes which form a diploid zygote by fertilization.

The female gametophyte is developed in the ovary of the plant which is present in the carpel of the flower. It happens in two phases Megasporogenesis and Megagametogenesis.

Megasporogenesis

A diploid megaspore mother cell, present  in the ovule undergoes meiosis and 4 haploid megaspores are formed. Only one out of four survives.

Megagametogenesis

The Megaspore produced  undergoes mitosis to produce 8 nuclei. 2 polar nuclei fuse in the center forming a secondary nuclei, out of the remaining 6 nuclei 3 each move towards the opposite poles. The megaspore matures to form the embryo sac.

After pollination, fertilization takes place in the embryo sac, within the ovary of the plant. When provided with suitable conditions it forms a seed.