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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.

Text Solution

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The correct Answer is:
A
Fertilisation can only occur if the ovum and sperms are tranported simultaneously to the ampullary-isthmic junction and ovum is released only once a month. This is one of the reasons why all copulations do not lead to fertilisation and pregnancy.
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Explore conceptually related problems

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

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

Knowledge Check

  • 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.

    A
    Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion(A).
    B
    Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
    C
    Assertion (A) is true but reason (R) is false.
    D
    Assertion (A) is false but reason (R) is true.

  • Fertilisation can only occur if the ovum and sperms are transported simultaneously to the

    A
    Ampullary - isthmic junction
    B
    Ampullary - infundibular junction
    C
    Uterine cavity
    D
    Cervical conal

  • Assertion: All copulations cannot lead to fertilisation and pregnancy. Reason: Fertilisation can only occur if the ovum and sperms are transported simulaneously to the ampullary region.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    From a to d which of the following statements are correct ? (a) Fertilisation can occur only if the ovum and sperm are transported simultaneously to the ampullary isthmic junction (b) First movement of foetus and appearance of hair on head are usually observed during the fifth month of pregnancy . (c) On 14^(th) day of Menstrual cycle , the level of progesterone is maximum . (d) The signals for parturition originate from fully developed foetus and placenta

    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 .

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

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