The key function of the kidneys is _?

A. Removal of urea and other nitrogenous wastes from blood

B. Production of digestive enzymes

C. Regulation of blood sugar levels

D. Pumping oxygenated blood to tissues

Sperm head contains _?

A. Large amount of mitochondria

Everyday Science · Body Systems (Human Biology) · page 13 of 13

Excretory & Reproductive MCQs with Answers

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Excretory & Reproductive Systems MCQs (121–128)

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121.
Main function of the epididymis is to ?
Correct Answer: C. Transport sperms
One-liner
The main function of the epididymis is to transport sperms from the testes to the vas deferens.
122.
The distal tubule of human kidney plays a key role in regulating _?
Correct Answer: C. Salts
One-liner
The distal convoluted tubule of the human kidney plays a key role in regulating salts (particularly sodium and potassium balance) under hormonal control.
123.
The key function of the kidneys is _?
Correct Answer: A. Removal of urea and other nitrogenous wastes from blood
One-liner
The key function of the kidneys is the removal of urea and other nitrogenous wastes from blood.
124.
Which of the following is considered the smallest cell in the human body?
Correct Answer: B. Sperm cell
One-liner
The sperm cell is considered the smallest cell in the human body.
125.
Which one of the following is not an excretory organ?
Correct Answer: C. Adrenal gland
One-liner
The adrenal gland is not an excretory organ; it is an endocrine gland that secretes hormones.
126.
Which organ in the male reproductive system is responsible for forming sperm?
Correct Answer: D. Testes
One-liner
The testes are the primary male reproductive organs responsible for sperm formation (spermatogenesis).
127.
Sperm head contains _?
Correct Answer: D. Large amount of DNA
One-liner
The sperm head contains a large amount of DNA packed tightly in its nucleus.
128.
Which layer of uterus is composed of contractile muscles?
Correct Answer: D. Myometrium
One-liner
The layer of the uterus composed of contractile muscles is the myometrium.

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Excretory & Reproductive MCQs with Answers

Excretory & Reproductive Systems MCQs (121–128)

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