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Assertion: All copulations do not lead t...

Assertion: All copulations do not lead to the fertilisation and pregnance.
Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

A

Assertion and reason both are correct statements the reason is the correct explanation of the assertion.

B

Assertion and reason both are correct statements but reason is not the correct explanation of the assertion.

C

Assertion is true but reason is false statement.

D

Assertion is false but reason is true statement.

Text Solution

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The correct Answer is:
A
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Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote. Assertion (A): All copulations do not lead to the fertilisation and pregnancy. Reason (R): Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampulllary-isthmic junction.

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Why do all copulations not lead to fertilisation and pregnancy ? The root cause is ______

which of the following statements regarding fertilization and implantation are incorrect ? I. During fertilization , a sperm first comes in contact with the corona radiata cells produced by the ovum. II. Fertilization occurs only if sperm and ovum are simultaneously transported to the ampullary region. III. Implantation occurs about 7 days after fertilization . IV. The continuous division of morula leads to the formation of zygote.

Assertion . Female gametophyte in angiosperm is eight nucleate . Reason. Double fertilisation occurs in angiosperm .

Menstruation only occurs if the released ovum is not fertilised. Why?

A : Lack of menstruation may be indicative of pregnancy R : Menstruation only occurs if the released ovum is fertilised