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Question
Assertion: Five closely related species of warblers living on the same tree were able to avoid competition and could co-exist.
Reason: They showed behavioural differences in their foraging activities.
Assertion: Five closely related species of warblers living on the same tree were able to avoid competition and could co-exist.
Reason: They showed behavioural differences in their foraging activities.
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Solution
The correct option is A Both the assertion and reason are true and reason is the correct explanation of assertion
Competition is a type of population interaction in which the fitness of one species is significantly lower in the presence of another species. It occurs when two species compete for the same resources that are limiting. This type of interaction has a negative effect on both the interacting species (-/- interaction).
MacArthur studied five closely related species of insectivorous birds called warblers. They lived on the same coniferous trees. He observed that the different species of warbler divided their time differently in various parts of the tree. One species of bird was found to feed at the tips of branches while a different species fed mostly in the middle zone of the tree. A third warbler species fed at the base of tree. Similarly, various different positions on trees were distinguished.
MacArthur also recorded details of the warblers' foraging habits and discovered that they differed too. They also had different sleeping times, and thus the times of their peak food requirements were not the same. Thus, they were able to co-exist by reducing the intensity of competition for the same resource i.e supply of insects. This phenomenon is called resource partitioning.
Hence both the assertion and reason are true and reason is the correct explanation of assertion.
Competition is a type of population interaction in which the fitness of one species is significantly lower in the presence of another species. It occurs when two species compete for the same resources that are limiting. This type of interaction has a negative effect on both the interacting species (-/- interaction).
MacArthur studied five closely related species of insectivorous birds called warblers. They lived on the same coniferous trees. He observed that the different species of warbler divided their time differently in various parts of the tree. One species of bird was found to feed at the tips of branches while a different species fed mostly in the middle zone of the tree. A third warbler species fed at the base of tree. Similarly, various different positions on trees were distinguished.
MacArthur also recorded details of the warblers' foraging habits and discovered that they differed too. They also had different sleeping times, and thus the times of their peak food requirements were not the same. Thus, they were able to co-exist by reducing the intensity of competition for the same resource i.e supply of insects. This phenomenon is called resource partitioning.
Hence both the assertion and reason are true and reason is the correct explanation of assertion.
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