Q.

Niche is                                    [2018]

1 all the biological factors in the organism’s environment  
2 the physical space where an organism lives  
3 the range of temperature that the organism needs to live  
4 the functional role played by the organism where it lives  

Ans.

(4)

Niche is specific part of habitat occupied by individuals of a species which is circumscribed by its range of tolerance, range of movement, microclimate, etc. Hence, niche refers to the functional role played by the organism where it lives.