Q. What are the factors affecting buoyancy?

Q. How do biofertilizers enrich the fertility of the soil?

Q. What are hydrocarbons? Give one example.

Q. Explain briefly the problem of ‘what to produce’.

Q. Pitch – Blende is the source of some metals. Find the total No. of such metals among these: Hg, Rg, U , Th, Zn, Tc

Q. Define ureotelic organisms with examples.

Q. List the hormones secreted by ovary.

Q. What do you understand by the term that for water is 1.86 K kg/mol?

Q. What is meant by the following terms Shearing ?

Q. Write two examples of ferromagnetic substances.