Short Answer Type(ii) Environmental resistance. The factors such as shortage of food, disease, predation, environmental natural calamities which impose a check on population size constitute environmental resistance. Environmental resistance decreases the rate of population growth.
(iii) Carrying capacity. It is a measure of the feeding capacity of an environment or ecosystem for a population of a species under a given set of conditions. If the population reaches its carrying capacity then the no further growth of the pooulation takes place.
Long Answer Type
Multiple Choice QuestionsSelect the statement which explains best parasitism.
One organism is benefited.
Both the organisms are benefited.
One organism is benefited, other is not affected.
One organism is benefited, other is affected.
Short Answer TypeStudy the graph given below and answer the questions that follow:
(i) Write the status of food and space in the curves (a) and (b).
(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?
(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line.
Long Answer Type'Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies.' Explain.
Short Answer TypeWrite the equation that helps in deriving the net primary productivity of an ecosystem.
Explain mutualism with the help of any two examples. How is it different from commensalism?
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