Short Answer Type
Long Answer TypeGause’s competitive exclusion principle states that two closely related species competing for the same resources cannot exist together indefinitely as the competitively inferior one will be eliminated eventually.
Mac Arthur had shown that five closely related species of warblers living on the same tree were able to avoid competition and co-exist to behavioural differences in their foraging activities. He gave an example of 'competitive release'.
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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