Give a brief account on the phases of the life cycle of an angiosperm plant.

Explanation

1) The life cycle of an angiospermic plant has two alternating . phases namely the sporophytic and gametophytic phases.
2) in angiosperms the plant body belongs to diploid (2n) sporophytic phase. This dominant phase of life cycle bears reproductive organs (flowers).
3) The haploid (n) gametophytic phase of angiospermic plant is dervied from microspores (n) and megaspores (n).
4) Microspores (pollen grains) are the meiotic products of microspore mother cells that develop in an anther.
5) Megaspores are the meiotic products of megaspore mother cell that develop from the nucellus of the ovule:
6) micro and megaspores produce male and female gametophytes respectively.
7). Male and female gametes formed respectively from male and female gametophytes are fused to form diploid (2n) zygote.
8) Zygote after undergoing repeated mitotic divisions produce embryo in the seed.
9) The embryo (2n) develops into a sporophytic plant during seed germination