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Fertilisation in humans is practically f...

Fertilisation in humans is practically feasible only if
i.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the cervix.
ii.The sperm are transported into cervix within 48 hours of release of ovum in uterus.
iii.The sperm are transported into vagina just after the release of ovum in fallopian tube.
iv.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

A

The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the cervix.

B

The sperm are transported into cervix within 48 hours of release of ovum in uterus.

C

The sperm are transported into vagina just after the release of ovum in fallopian tube.

D

The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Fertilization**: Fertilization in humans occurs when a sperm cell successfully merges with an ovum (egg cell). This process is crucial for the formation of a zygote, which eventually develops into an embryo. 2. **Identifying the Location of Fertilization**: The fertilization process primarily takes place at the ampullary-isthmic junction of the fallopian tube. This is the area where the sperm and ovum meet. 3. **Analyzing the Options**: - **Option i**: "The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the cervix." - This option is incorrect because fertilization does not occur in the cervix; it occurs in the fallopian tube. - **Option ii**: "The sperm are transported into cervix within 48 hours of release of ovum in uterus." - This option is partially correct but does not specify the crucial point that fertilization occurs in the fallopian tube, not the cervix. - **Option iii**: "The sperm are transported into vagina just after the release of ovum in fallopian tube." - This option is incorrect as it suggests that sperm should enter the vagina after the ovum is released, which is not the correct sequence for fertilization. - **Option iv**: "The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the fallopian tube." - This option is correct. For fertilization to occur, both the sperm and the ovum must reach the ampullary-isthmic junction of the fallopian tube simultaneously. 4. **Conclusion**: Based on the analysis of the options, the correct answer is option iv. Fertilization in humans is practically feasible only if the ovum and sperm are transported simultaneously to the ampullary-isthmic junction of the fallopian tube. ---
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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

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

Ovum released from ovary and is transported to the fallopian tube for fertilisation . Trace the correct path the egg and embryo takes from ovary to uterus .

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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.

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