Hello Aanchal

Hemisphere is not the part of the physical environment.

Hemisphere is a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.

While all the others i.e lithosphere, atmosphere and hydrosphere is a part of physical environment.

So right answer is Hemisphere as it is not the part of the physical environment.

Thank you