Question

Draw a neat diagram of megasporangium of an angiosperm and label any six parts.

Hint:

Always draw the micropyle at the bottom and chalaza at the top to represent a standard anatropous ovule. Labeling the 'Embryo sac' inside the 'Nucellus' is vital.

Answer 1

Step 1: Understanding the Concept:
The megasporangium is commonly known as the ovule. In most angiosperms, it is anatropous (inverted).
Step 2: Detailed Explanation:
A typical anatropous ovule consists of:
1. Funicle: The stalk that attaches the ovule to the placenta.
2. Hilum: The region where the body of the ovule fuses with the funicle.
3. Integuments: One or two protective envelopes (Outer and Inner).
4. Micropyle: A small opening at the tip where integuments are absent.
5. Nucellus: A mass of parenchymatous cells enclosed within the integuments, containing food reserves.
6. Embryo sac: The female gametophyte located in the nucellus.
7. Chalaza: The basal part of the ovule, opposite the micropyle.
Step 3: Final Answer:
The diagram should clearly show the inverted structure with at least six labels: Funicle, Hilum, Micropyle, Nucellus, Embryo sac, and Chalaza.