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Solution


Q.

Gause’s principle of competitive exclusion states that              [2016]
1 no two species can occupy the same niche indefinitely for the same limiting resources  
2 larger organisms exclude smaller ones through competition  
3 more abundant species will exclude the less abundant species through competition  
4 competition for the same resources exclude species having different food preferences  

Ans.

(1)

Two or more species with closely similar niche requirements cannot exist indefinitely in the same area as sooner or later they come into competition for possession of it. This is called as Gause’s principle of competitive exclusion, which states that an ecological niche cannot be simultaneously and completely occupied by established populations of more than one species. Two species can live in same habitat but not in the same niche. More similar the two niches are, severe the competition is.