Question

In the list of animals given below, the hen is the odd one out. (human beings, cow, dog, hen). The reason for this is

• A. It undergoes internal fertilization.
• B. It is oviparous.
• C. It is viviparous.
• D. It undergoes external fertilization.

Answer 1

The correct option is B

It is oviparous.

The correct option is B.

Explanation of the Correct option:

1. The hen is the odd one out because it is oviparous, i.e. it lays an egg from which young ones are hatched later on.
2. Viviparous animals have a placenta that helps in nourishing the baby.
3. Examples of viviparous are species of snakes and sharks.
4. Human beings, cows, and dogs are viviparous animals.

Explanation of the Incorrect option:

Option A:

1. Viviparous animals do undergo internal fertilization which means that the fusion of male and female gametes occurs inside the female body.

Option C:

1. Viviparous animals undergo internal fertilization and the embryo develops inside the mother until a young one is born.

Option D:

1. Generally, organisms present in water undergo external fertilization which means the fusion of male gamete and female gamete occurs outside the body.
2. Example: Amphibians & Fishes.

Final answer: In the list of animals given below, the hen is the odd one out. (human beings, cow, dog, hen). The reason for this is it is oviparous.