Question

Relative sizes of egg cell, morula, blastula and gastrula cells are

• A. Egg cell is the smallest and gastrula cell is the largest
• B. All are of equal size
• C. Egg cell is the largest and morula cell is the smallest
• D. Egg cell is the largest and gastrula cell is the smallest.

Answer 1

The correct option is C Egg cell is the largest and morula cell is the smallest

The egg cell is the largest human cell. It measures from 0.15 to 0.2 mm and is just visible to the naked eye (largest).

Morula is a 32-celled structure with size dimensions of 60-85 micrometers (smallest).

The blastula has a diameter of about 0.1-0.2 mm and has 200-300 cells which follow rapid cell division i.e. cleavage.

The gastrula is an embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells.