What is the full form of HIV? Name the disease caused by HIV.

What are antibiotics? What precautions must be taken while taking antibiotics?

Why are antibiotics not effective against 'common cold' and 'flu'?

Describe how, curd is made from milk. Name the bacterium which converts milk into curd:

Name the micro-organism used in bread-making which makes the bread-dough rise. How does it make the dough rise?