Question

The Largest cell in the Human body
a. WBCs
b. RBCs
c. Sperm
d. Ovum

Answer 1

Hint: Human body is composed of various kinds of cells. The cells differ widely in the shape and size. The shape and size of the cell varies in accordance to the function they have to perform. The RBC and WBC are the blood cells whereas the sperm and ovum are the reproductive cells.

Complete answer:
• WBCs- It is known as white blood cells. These are present in the blood. These are the cells of the immune system and protect our body against foreign invasions. The average diameter of WBC is 14-16 micrometre.

• RBCs- It is also known as red blood cells. It is one of the very important cells of the blood as they transport oxygen. They are biconcave disc-like and lack nucleus. The diameter of the RBC is at an average 7-8 micrometre.

• Sperm- Sperm is a motile cell which contains male reproductive gametes. It contains a flat disc shaped head and a tail. The diameter of the head is around 5 micrometres.

• Ovum-The ovum is identified to be the largest cell compared to other cells in the human body. The other name of ovum is the egg cell or female gamete which is involved in the reproduction process of female human beings. The ovum can be visualized by naked eye. Diameter of the human ovum is 0.1 millimetre. The size of the ovum is found to be 20 times bigger than the sperm cells.

Thus, on comparing the size of the above cells, we can conclude that the ovum is the largest cell in the human body.
Hence the correct answer is options (d).

Note: The egg cell is one of the largest cells in the human body. The egg cell can be viewed by naked eye. The yolk of the ovum or the central substance which contains nucleus, nucleolus and germinal spot.
• Mitochondria and cytoplasm of the egg cell or ovum are responsible for all the functions
• Every female is born with seven million egg cells.
• Every woman contributes to egg cell loss during menstruation every month until the period of menopause.