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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In monosporic (Polygonum) type of development of embryo sac, only one megaspore situated towards chalazal end remains functional. The remaining three megaspores gradually degenerate and finally disappear. The functional haploid megaspore enlarges in size and by means of three successive mitotic division, gives rise to an eight-nucleate embryo sac. This type of embryo sac development occurs in a majority of flowering plants and the common example is Polygonum.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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