1. Mammals are homeothermic animals.   False   True   2. When coal is burnt, _______ energy is converted into light and heat.   Atomic   Chemical   Electric   Hint Half-n-half Clue   3. Which is a by-product of photosynthesis ?   Nitrogen   Oxygen   Carbon dioxide   ATP   Half-n-half Clue   4. Interaction between organisms of different species so as to get benefit from each other is known as   Symbiosis   Etiolation   Saprophytism   Predation   Half-n-half Clue   5. Which is not a 'renewable' resource of energy ?   Petroleum   Sun   Wind   Water   Half-n-half Clue   6. The response of plants to light is known as   Chemotropism   Thigmotropism   Hydrotropism   Phototropism   Half-n-half Clue   7. From the bark of which tree is quinine obtained?   Redwood   Cinchona   Bunyan   Eucalyptus   Half-n-half Clue