| 46. | In any community, various populations live |
| a. | interdependently |
| b. | independently |
| c. | dependently |
| d. | defenselessly |
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Answer: (a).interdependently
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| 47. | Both abiotic and biotic factors operating in an environment are called as |
| a. | ecological niche |
| b. | ecological community |
| c. | ecosystem |
| d. | ecology |
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Answer: (c).ecosystem
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| 48. | Series of energy transference in the form of food is called a |
| a. | food pyramid |
| b. | food chain |
| c. | ecological niche |
| d. | food cycle |
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Answer: (b).food chain
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| 49. | Density can be measured through |
| a. | number of individuals per square meter |
| b. | number of individuals per unit area |
| c. | number of total population in a mile |
| d. | volume per unit mass |
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Answer: (b).number of individuals per unit area
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| 50. | Lives of organisms are greatly affected by |
| a. | Producers |
| b. | Consumers |
| c. | Decomposers |
| d. | consumers and decomposers |
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Answer: (a).Producers
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