No, the offspring of asexual reproduction is not larger than the parent cell. Asexual production involves only one parent, and the product of the reproduction looks exactly like the parent call. Bacteria, single celled organisms, and other simple cells perform asexual reproduction.
Niche refers to adaptive features of an organism, its activity pattern and consumption of resources in the system.
Niche of an organism refers to its habitat, activity role and functional position within system. It includes the resources such as food that it obtains from the habitat for its survival.
