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2.Human Reproduction
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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
A
Assertion and Reason both are correct and also correct explantion.
B
Assertion and Reason both are correct but not explanation of assertion.
C
Assertion is correct, but Reason is incorrect.
D
Both Assertion and Reason are incorrect.
Solution
Sperm is viable for $48 \;to \;72\; hours$
Ovum life is for $24\; hours$
Both have to be viable for fertilization when they reach ampullary – isthmic junction.
Standard 12
Biology
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