Question

The ……….. is the largest cell in the human body?
(a) RBCs
(b) WBCs
(c) Ovum
(d) Sperm

Answer 1

They are single-cell, non-motile delivered from either of the female reproductive organs (ovaries). They are competent to evolve into a new organism when fertilized with sperm.

Complete answer:
The ovum is the unique largest cell in the human body. The egg can be seen by the naked eye as it is equivalent to a strand of hair. A follicle-stimulating hormone, liberated into the bloodstream through the pituitary, causes ovum growth. After the egg matures, a second hormone from the pituitary, luteinizing hormones, is released which causes the egg to deliver outside the ovary and this process is known as ovulation. Throughout fetal life, there are approximately 6 million to 7 million eggs. From this time, no new eggs are produced. At birth, there are around 1 million eggs; and over the time of puberty, only around 300,000 remain. Of these, only 300 to 400 are going to be ovulated during a woman's reproductive lifetime. Fertility can decline as a woman ages due to the reducing number and quality of the remaining eggs.

Additional information:
Oogenesis is the method of the development of female gametes. This process begins inside the fetus before birth. When a follicle attains maturity, the first oocyte finishes its primary meiotic division and becomes a secondary oocyte. Soon after, the follicle breaks, and the secondary oocyte is liberated within the Fallopian tube even when the second meiotic division has not happened. This release of a secondary oocyte from ovaries is known as ovulation.
The sperm is the smallest cell in human biology, but also one among the foremost complex. A human sperm comprises a flat, disc-shaped head 5.1 µm through 3.1 µm and a tail 50 µm long. The discocyte appearance of human RBCs is around 7.5 to 8.7 μm in diameter and 1.7 to 2.2 μm in thickness. WBCs have an irregular shape. The size differs from 6 to 8 µm in diameter. Size varies from 12 to 17 µm in diameter.

So, the correct answer is ‘Ovum’.

Note:
The ovum also called the egg cell is the reproductive cell in the female body. Ovum is 20 times bigger than the sperm cells and has a diameter of about 0.1 mm. Once ovulation has arrived, the female egg cell that’s released starts to decay very quickly and after 12 to 24 hours the egg cell will die.