(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Assertion: fusion between one large non motile female gametes and
smaller model male gametes is termed as oogamous
Reason: example of two oogamous are volvox and fucus.

Dear student, 

Your question seems to have certain typing errors. By making certain assumptions, your solution  has been provided below:

The correct answer is (b) Both A and R are correct, but R is not the right explanation of A.
Volvox and Fucus indeed are Examples of oogamous algae species, but it doesn't explain the oogamy mode of reproduction in plants, thus option b.

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