Question

Assertion: The method of development of embryo sac from a single functional megaspore is termed monosporic development.
Reason: In monosporic embryo sac development, usually the megaspore which is situated towards the micropylar end remains functional.

• A. Both assertion and reason are true and & reason is the correct explanation of assertion
• B. Both assertion and reason are true but reason is not the correct explanation of assertion
• C. Both assertion and reason are false
• D. Assertion is true but reason is false

Answer 1

The correct option is D Assertion is true but reason is false

When embryo sac develops from a single functional megaspore, it is called monosporic development. It is common in most angiosperms. In this, only one megaspore situated towards the chalazal end remains functional and the rest three degenerates and finally disappear.

The functional megaspore then goes through three successive equational/mitotic divisions and make an eight-nucleate embryo sac.