Ecology MCQs 1

Question #1: Animal behaviour patterns, in which an individual endangers its life to benefit other members of the group, are called altruistic. It is believed that altruistic behaviour is favoured by kin selection. Which of the following does not explain kin-selection ?

Question #2: The prime effect of territorial behaviour in social mammals is usually to:

Question #3: In a lake, the ratio of productivity of phytoplankton to productivity of zooplankton per year was calculated to be 9.5 : 1. How is this figure consistent with the principles of energy transfer through an ecosystem?

Question #4: Competition between members of different species is called:

Question #5: In a food chain isolated from others, which of the following (measured in kJ m-2) is numerically the greatest?

Question #6: Which of the following processes occur during the nitrogen cycle? 1. The oxidation of nitrites to nitrates by root nodule bacteria. 2. Consumption of plant protein by herbivores. 3. The conversion of dead organisms into ammonia by decomposers. 4. Conversion of ammonium compounds into nitrates by denitrifying bacteria. 5. The oxidation of ammonium compounds into nitrites by nitrifying bacteria.

Question #7: The increase in the Index of Diversity is one indication that a biological succession is taking place in an area. Which of the following are features of succession that would bring about an increase in the Index of Diversity? 1. Initial hostile environment 2. More niches or habitats 3. Increase in available humus content in the soil 4. Increase in minerals in the soil 5. A stable environment 6. Grazing by animals.

Question #8: Which of the following would you expect to be absent, or very rare, on acid soils, deficient in calcium?

Question #9: The life cycle of the Large Blue butterfly depends on a species of red ant. The ants, acting on a chemical secretion similar to that produced by their own grubs, place the Large Blue caterpillar in their brood chambers, where it feeds voraciously on ant grubs. The relationship is described as:

Question #10: Which of the following lists shows areas or regions where organisms are found in order of decreasing size?

Also read Ecology Mnemonic



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