Question

write down the names of post fertilisation event in the flowering plant and describe the process in embryo development in dicot with daigram.

Answer 1

post fertilization events are-
1.endosperm development
2.embryo development
3.ovules maturing into seed
4.ovary maturing into fruit



embryogeny in dicots-
1.zygote divides into two unequal cells,larger suspensor cell towards micropyle and smaller embryonal cell towards antipodal region.
2.suspensor cell undergoes transverse divisions forming 6-10celled long suspensor
3.first cell of suspensor (towards micropyle) is large and called haustorium or vesicular cell.
4.last cell of suspensor towards embryo cell is called hypophysis.it forms radicle tip.
5.embryonal cell divides twice vertically and once transversely to produce two tiered eight-celled embryo.
6.the epibasal tier firms two cotyledons and a plumule while hypobasal tier produces only hypocotyl and most of radicle.
7.for this the octant embryo undergoes periclinal divisions producing protoderm,procambium and ground meristem.it is initially globular but with the growth of cotyledons it becomes heart shaped and then assumes the typical shape.