The correct option is A False
Cells show great diversity in their shapes and sizes. The size and shape of a cell are related to its function. Some multicellular organisms may have smaller sized cells as compared to many unicellular organisms. Some single cells like the eggs of birds and reptiles are quite large. A nerve cell may attain a length of several meters while red blood cells are only 5-8µm in diameter. Also, within an organism, the cells rarely remain in the spherical form. They are either flattened (epithelial cells), spindle-shaped (muscle cells), spider-shaped (nerve cell), etc.