Question

Why do cells have different shapes and sizes ?

Answer 1

Animal cells in particular come in all kinds of shapes and sizes. Plant cell shapestend to be quite similar to each other because of their rigid cell wall. Cells are ofdifferent shape,size and structure according to the function they needs to perform. ... Neurons are cells in the brain and nervous system.
or
Cells attain different sizes and shape in order to carry out specific functons. Some cells in body are use for carrying oxygen to tissues and organs while some fight against bacterial, fungal or viral infecions to get rid of them.