1. Nitrogen-fixing bacterium   Clostridium   Lactobacillus   Rhizobium   Salmonella   Hint Half-n-half Clue   2. When coal is burnt, _______ energy is converted into light and heat.   Electric   Atomic   Chemical   Half-n-half Clue   3. The property of plants to manufacture their food is known as _______.   Phototropism   Phototaxis   Photokinesis   Autotrophism   Half-n-half Clue   4. Which is not a 'nonrenewable' source of energy ?   Petrol   Coal   Soil   Wind   Half-n-half Clue   5. 'Lac' is a plant product.   True   False   6. What is quinine used for ?   Curing Malaria   Curing Aids   Removing pimples   Curing Typhoid   Half-n-half Clue   7. What is the name given to the green pigment in plants ?   Stomata   Chlorophyll   Starch   Tendrils   Half-n-half Clue