1. Which is a by-product of photosynthesis ?   Carbon dioxide   Nitrogen   Oxygen   ATP   Hint Half-n-half Clue   2. Mammals are homeothermic animals.   False   True   3. What is quinine used for ?   Curing Typhoid   Curing Aids   Removing pimples   Curing Malaria   Half-n-half Clue   4. When water is boiled, it is converted into steam. This is an example of conversion of _______ energy to mechanical energy.   Light   Chemical   Heat   Atomic   Half-n-half Clue   5. Man is an amphibian.   True   False   6. _______ convert chemical energy to electrical energy.   Bulbs   Battery cells   Microwave ovens   Air conditioners   Half-n-half Clue   7. Which is not a 'nonrenewable' source of energy ?   Coal   Petrol   Wind   Soil   Half-n-half Clue