Question

What is a morula?

Options

• An extra-embryonic sac involved in waste storage

• A hollow fluid-filled embryonic stage in humans

• A solid, mulberry-like ball of cells formed after cleavage

• The outer layer of cells in the blastocyst

Answer 1

A morula is a solid ball containing 16-32 blastomeres that forms after repeated cleavage divisions. It derives its name from its resemblance to a mulberry fruit and represents a key transitional stage before blastocyst formation.