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

Reason. 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.

Assertion. The analogous organ to the vermiform appendix in herbivorous mammals is quite helpful in digesting cellulose. But it is considered a vestigial organ in humans.

Reason. Vermiform appendix is a wide worm-like tubular structure, projecting from the blind part of the colon (a part of large intestine). Its function is the same as that of the colon, i.e., absorption of water and some remnants of digested food.

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. Population density is the number of individuals in an area of 100 square kilometers per year.

Reason. Population density gives us an idea of all the living organisms of different species in a particular area every year.

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. Tubectomy is a temporary method of contraception for males in which the sperm ducts are cut and ligated with a nylon thread.

Reason. Tubectomy closes the passage of the sperms. The sperm duct is also known as vas deferens, which stores the sperms for some days during which they mature and become motile.

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.