Reason as per NCERT:

As per NCERT, the correct answer to the question "The technique to assist those females who cannot conceive includes" is option A, i.e. IVF followed by embryo transfer.

Explanation:

Let's understand the different techniques mentioned in the options and why IVF followed by embryo transfer is the correct answer.

A) IVF followed by embryo transfer:

- IVF stands for In Vitro Fertilization, which is a process of fertilizing an egg with sperm outside the body in a laboratory dish.
- Once the fertilization occurs, the resulting embryo(s) is/are transferred into the uterus of the woman who wants to conceive.
- This technique is used in cases of infertility due to various reasons such as blocked fallopian tubes, low sperm count, endometriosis, etc.
- IVF is a complex and expensive procedure, but it has a high success rate and has helped many couples to conceive.

B) In-vivo fertilization followed by embryo transfer:

- In-vivo fertilization means fertilization that occurs inside the woman's body naturally.
- Once the fertilization occurs, the resulting embryo(s) is/are transferred into the uterus of the woman who wants to conceive.
- This technique is not commonly used as it requires the woman to have a healthy reproductive system and the ability to conceive naturally.
- It is not a viable option for women who are infertile due to other reasons such as blocked fallopian tubes or low sperm count.

C) Gamete intrafallopian transfer:

- Gamete intrafallopian transfer (GIFT) is a technique where the sperm and eggs are collected from the couple and directly transferred into the woman's fallopian tubes.
- The fertilization occurs inside the woman's body naturally.
- This technique is not commonly used as it requires a woman to have healthy fallopian tubes and the ability to conceive naturally.
- It is not a viable option for women who are infertile due to other reasons such as blocked fallopian tubes or low sperm count.

D) Intrauterine insemination:

- Intrauterine insemination (IUI) is a technique where the sperm is collected from the male partner and inserted directly into the woman's uterus using a catheter.
- This technique is used in cases where the sperm count is low or the sperm motility is poor.
- It is not a viable option for women who are infertile due to other reasons such as blocked fallopian tubes or ovulation disorders.

Conclusion:

IVF followed by embryo transfer is the correct option as it is a viable option for women who are infertile due to various reasons and has a high success rate. The other techniques mentioned in the options are not commonly used or not suitable for women who are infertile due to other reasons.

If a female is not able to conceive that means she is not having fertile gametes and her uterus is not suitable for giving nutrition and support to embryo or we can also say that morula formation is not hapenning.
To overcome this problem in-vitro fertilisation is used in which fertilisation occurs in test tube and embryo is formed which is later transferred to uterus.