ECOLOGY
ORGANISMS AND POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The population size of the animal’s predator increased.
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The emigration rate of the animals from the population decreased.
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The number of breeding pairs in the animal’s population increased.
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The number of species competing with the animal for food decreased.
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Detailed explanation-1: -An animal population decreases from 800 individuals to 600 individuals. What could explain this change in population size? The population size of the animal’s predator increased.
Detailed explanation-2: -Which of the following most likely describes the birthrate and the death rate for this population? Birthrate is significantly greater than death rate. If birthrate was greater than death rate, the population would be increasing.
Detailed explanation-3: -Which of the following is a likely alternate explanation for the change in the mullet population? If the amount of the major producer in an area is reduced, populations of consumers will also be reduced. Since the mullet feed on aquatic plants, their population would decline in response to declining numbers of plants.
Detailed explanation-4: -If a population exceeds carrying capacity, the ecosystem may become unsuitable for the species to survive. If the population exceeds the carrying capacity for a long period of time, resources may be completely depleted. Populations may die off if all of the resources are exhausted.
Detailed explanation-5: -How would an increase in prey effect the carrying capacity of a particular ecosystem? It would decrease. How would a sudden increase in parasites, within a population, affect the population’s growth? The death rate would increase.