What is the necessity of such like prefixes?

What is the necessity of eye donation? Explain

What is the advantage of techniques like PCR and ELISA over conventional methods?

What is the function of receptors in the body? Think of situations where receptors do not work properly. What problems are likely to arise?

Name the oxygen binding pigment found in root nodules of plants like bean and pea. What is the normal colour of this pigment?

A survey of 250 boys of a school was conducted and it was found that 110 like coffee and 140 do not like coeffee. Out these boys, one boy is selected at random. What is the probability that the selected boy: does not like coffee?

Roots in gram, groundnut,pea, barseem bear small nodule like swellings. What is the function of root nodules?

The compound CuCl has fcc structure like ZnS. Its density is 3.4 gcm^-3 . What is the length of the edge of the unit cell?