L.S of an Angiospermic ovule

Exercise : L.S of an Angiospermic ovule.

Aim: To study and identify the L.S. of an Angiospermic Ovule.

Principle: In female reproductive part of a flower, the basal swollen part is ovary. The ovules are present inside the ovary, later they develops to seed.

Requirement: Permanent slide of L.S. of Ovule, microscope

Diagnostic Features

·        Ovule or megasporangium is protected by one / two coverings called integuments.

·        The stalk of the ovule is called funicle.

·        The point of attachment of funicle to the body of the ovule is known as hilum.

·        The body of the ovule is made up of a central mass of parenchymatous tissue called nucellus.

·        The integuments form a pore called micropyle and the region opposite to the micropyle is called as chalaza.

·        The nucellus has a large, oval, sac like structure towards the micropylar end called embryo sac.

·        A mature ovule, has 8 nuclei in its embryo sac.