A: All copulations do not lead to fertilisati | vedclass

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(A) The Assertion is correct because fertilisation is a chance event that requires the presence of both gametes at the same time and place.Sperms are

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The Assertion is correct because fertilisation is a chance event that requires the presence of both gametes at the same time and place.Sperms are viable for $48$ to $72$ hours,while the ovum is viable for only about $24$ hours.For fertilisation to occur,the ovum and sperms must be transported simultaneously to the ampullary-isthmic junction of the fallopian tube.If this timing does not coincide,fertilisation will not occur,which explains why not all copulations result in pregnancy.

$A$: All copulations do not lead to fertilisation and pregnancy.
$R$: Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.

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$A$: All copulations do not lead to fertilisation and pregnancy.$R$: Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.