Apart from elephants, you can find tusks in:
1. Walrus
2. Sperm Whale
3. Boar
4. Ganges river dolphin
5. Hippopotamus

Select the correct option from the codes given below:

Answer: [A] 1, 2, 3 & 5

Tusks are found in tusks of elephants and teeth of mammals such as the hippopotamus, walrus, boar, sperm and killer whale. It gets strength  and rigidity from inorganic components called mineralized tissues. The organic element, collagen, helps in the growth and repair of ivory, which has no blood vessels, is porous and absorbs and releases moisture.

This question is a part of GKToday's Integrated IAS General Studies Module