Niche (1)The limits,for all important environmental variables, within which individuals of a species can survive,grow, and reproduce. (2)The specific set of environmental/habitat conditions that permit the full development and completion of the life cycle of an organism (K)Niche (1) The limits, for all important environmental variables, within which individuals of a species can survive, grow, and reproduce. (2) The specific set of environmental/habitat conditions that permit the full development and completion of the life cycle of an organism (K)