1. Which is not a 'biotic part' of the ecosystem ?   Bacteria   Water   Plants   Insects   Hint Half-n-half Clue   2. Autotrophic component of the ecosystem   All of these   Consumers   Decomposers   Producers   Half-n-half Clue   3. Which organism is helpful in making the soil fertile ?   Earthworm   Beetle   Roundworm   Ringworm   Half-n-half Clue   4. Nitrogen-fixing bacterium   Lactobacillus   Clostridium   Salmonella   Rhizobium   Half-n-half Clue   5. Belladona has medicinal properties.   False   True   6. Very high concentration of carbon dioxide accelerates plant growth.   True   False   7. _______ convert chemical energy to electrical energy.   Bulbs   Battery cells   Microwave ovens   Air conditioners   Half-n-half Clue