Question

A. MULTIPLE CHOICE TYPE
(Select the most appropriate option in each case)
1. Excretion primarily involves
(a) removal of all byproducts during catabolism.
(b) removal of byproducts during anabolism.
(c) removal of nitrogenous wastes.
(d) throwing out excess water
2. Maximum amount of water from the glomerular
filtrate is reabsorbed in
(a) proximal convoluted tubule
(b) descending limbs of loop of Henle.
(c) ascending limb of loop of Henle.
(d) distal convoluted tubule.
3. Which one of the following in real sense is NOT
an excretory activity ?
(a) Giving out carbon dioxide
(b) Passing out faecal matter
(c) Sweating
(d) Removal of urea.
4. In humans, urea is formed in
(a) ureter
(b) liver
(c) spleen
(d) kidney​

Answer 1

A. MULTIPLE CHOICE TYPE

(Select the most appropriate option in each case)

1. Excretion primarily involves

(a) removal of all byproducts during catabolism.

(b) removal of byproducts during anabolism.

☑ (c) removal of nitrogenous wastes.

(d) throwing out excess water

2. Maximum amount of water from the glomerular

filtrate is reabsorbed in

☑ (a) proximal convoluted tubule

(b) descending limbs of loop of Henle.

(c) ascending limb of loop of Henle.

(d) distal convoluted tubule.

3. Which one of the following in real sense is NOT

an excretory activity ?

(a) Giving out carbon dioxide

(b) Passing out faecal matter

☑ (c) Sweating

(d) Removal of urea.

4. In humans, urea is formed in

(a) ureter

☑ (b) liver

(c) spleen

(d) kidney

$\huge{\underline{\tt{\blue{ Additional \:information -}}}}$

Excretion - It is a biological process in which an organism removes toxic metabolic waste from the body.

The Human Excretory systems consists -

• A pair of kidney
• Ureters
• A urinary bladders
• Urethra

Kidney - It is located towards the back of the abdominal cavity. These are in bean shaped structure.

Functions -

• Responsible for regulating pH of blood.
• Homeostasis
• Maintain the constant concentration of blood plasma in our body.
• Purification of blood

Ureters - They are thin muscular tubes begins from kidney. They carry urine and urinary bladder.

Urinary Bladder - It is responsible for storing urine temporarily. It has pear shaped like structure.

Urethra - It is a duct which is responsible for transmitting the urine to the exterior of the body.

Urea - Urea is a chemical compound which is formed in liver.

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• Dialysis is responsible for artificial removal of waste from the human body.

• Urea is present at higher concentration in renal artery.

• The urea passes through -

Kidney → Ureter → Urinary bladder → Urethra.

• Ammonia is the most soluble nitrogenous waste in the water.

Answer 2

Answer:

1) (a)

2)(C)

3) (b)

4) (d)