Question

18.4 Which of the following statement(s) is (are) true about excretion in human beings?

I. Kidneys are the primary excretory organs.

II. The bladder is muscular, so it is under nervous control.

III. Each kidney has large numbers of filtration units called nephrons.

IV. Urine is stored in the urethra until the urge of passing it out.

(a) I and II only (b) I and III
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Answer 1

Answer:

Which of the following statement(s) is (are)

true about excretion in human beings?

I. Urine is stored in the urethra until the

urge of passing it out.

II. Each kidney has large numbers of

filtration units called nephrons.

III.The bladder is muscular, so it is under

nervous control.

IV.Kidneys are the primary excretory

organs.

(a) I and II only

(b) I and III only

(c) II, III and IV only

(d) I and IV only

Step-by-step explanation:

1.Each kidney has large numbers of

filtration units called nephrons.

4.Kidneys are the primary excretory

organs.

Answer 2

Option (I), (II), (III) are true statements about excretion in human beings.

Explanation:

• Excretion is one of the vital processes in the human body that involves the removal of wastes from our body through specific organs.

Excretory organs:

• The pair of kidneys in our body is the primary organ for excretion.
• Its primary function is to eliminate water from the bloodstream and other organs.

Nephrons:

• The basic functional unit of the kidneys is called Nephrons.
• There are about a million nephrons in each kidney for filtration purposes.
• After filtration, the water to be excreted flows via the ureter to the bladder and is excreted via Urethra.
• The urine is stored in the bladder and is controlled by the nervous system. Moreover, the bladder is made up of muscular tissues.