Assertion (A): The placenta is a vital organ during pregnancy, responsible for providing nutrients and oxygen to the developing foetus.

Reason (R): The placenta develops from the fusion of the zygote and the endometrial lining, forming a specialized tissue structure that facilitates the exchange of substances between the maternal and foetal bloodstreams.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Leydig cells produce oestrogen and progesterone.

Reason (R): Leydig cells are also called as interstitial cells which are located as packing tissues between the coils of seminiferous tubules.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Fertilization of the ovum and sperm occurs in the sperm duct of the female reproductive system.

Reason (R): Vas deferens carries sperms from the epididymis to the urethra of the male reproductive system.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Lamarck's theory of inheritance of acquired characters is mainly based on "survival of the fittest".

Reason (R): Lamarck has explained his principle of 'use and disuse' with the example of Giraffe's neck.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.