What is continental shelf?

What is continental drift? What is its significance?

In India, we find mangoes with the different flavours, colour, fibre content, sugar content and even shelf life. The large variation is ion account of

What is biogas? What are its components ? What is the calorific value of biogas?

What is kinetochore? What is its function?

(a) What is calcination ? (b) What is roasting?

What is Tyndall effect ? What is the cause of it ?