1. From the bark of which tree is quinine obtained?   Bunyan   Redwood   Cinchona   Eucalyptus   Hint Half-n-half Clue   2. Plants manufacture their food by the process of   Photosynthesis   Photokinesis   Chemosynthesis   Symbiosis   Half-n-half Clue   3. Silk fibre is produced by certain insects.   True   False   4. Which is a by-product of photosynthesis ?   Oxygen   Carbon dioxide   Nitrogen   ATP   Half-n-half Clue   5. _______ convert chemical energy to electrical energy.   Battery cells   Microwave ovens   Air conditioners   Bulbs   Half-n-half Clue   6. Which organism is helpful in making the soil fertile ?   Ringworm   Roundworm   Beetle   Earthworm   Half-n-half Clue   7. Which fungus is used in making bread?   Yeast   Aspergillus   Penicillium   Pleurotus   Half-n-half Clue