Question

Why are plants cells rectangular and animals cells spherical shaped?

Answer 1

plant cells have cell wall which is turgid and thus cannot change its shape

animal cells have cell membrane which keeps on changing the shape

Answer 2

This is also due to: Plant cells are not necessarily square, but they due tend to have distinct edges and be somewhat rectangular. This structure is caused by the cell wall which is very rigid and therefore forces the cell to have a defined shape.