Question

With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.

Answer 1

An ovule is a female megasporangium where the formation of megaspores takes
place.

(1)Funiculus-It is a stalk-like structure which represents the point of attachment
of the ovule to the placenta of the ovary.
(2)Hilum-It is the point where the body of the ovule is attached to the funiculus.
(3)Integuments-They are the outer layers surrounding the ovule that provide
protection to the developing embryo.
(4)Micropyle-It is a narrow pore formed by the projection of integuments.It
marks the point where the pollen tube enters the ovule at the time of fertilization.
(5)It is a mass of the parenchymatous tissue surrounded by the
integuments from the outside.The nucellusprovides nutrition to the developing
embryo.The embryo sac is located inside the nucellus.
(6)Chalazal-It is the based swollen part of the nucellus from where the
integuments originate.