Draw the diagram of megasporangium and label its parts. Also, write briefly about the parts of a megasporangium.

Explanation

Diagrammatic view of a typical anatropous ovule
The main parts of megasporangium (ovule) are:
(i) Hilum is a junction between ovule and funicle.
(ii) Each ovule has one or two protective envelopes called integuments.
(iii) Micropyle is an opening present at the tip where integument is absent.
(iv) Chalaza is opposite to the micropylar end representing the basal part of the ovule.
(v) The integuments enclose a mass of cells. called the nucellus, which have food reserves.
(vi) Embryo sac or female gametophyte is located in the nucellus (generally one formed from a megaspore through reductional division).