Question

The structural and functional unit of kidney is called

• A. nephron
• B. nephridia
• C. ureter
• D. urethra

Answer 1

The correct option is A

nephron

The correct option is A.

Explanation of the correct option:

1. Nephron are the coiled, tubular structures present in the kidneys.
2. They filter out the wastes from the blood and collects them to excrete.
3. These structures are present in millions of number.
4. Nephrons are therefore the fundamental unit of the kidney.

Explanation of the incorrect option:

Option B:

Nephridia are the excretory organs present in annelids such as earthworm, roundworms etc.

Option C:
Ureters are the paired, tubular structures which carry the urine produced inside the kidney to the urinary bladder to be excreted out.

Option D:

Urethra is a muscular, tube like structure present at the end of the urinary system which excretes out the urine.

Final answer: The structural and functional unit of kidney is called nephron.