In the nephron, the 'Loop of Henle' is primarily responsible for: MCQ with Answer and Explanation

In the nephron, the 'Loop of Henle' is primarily responsible for:
A. Reabsorption of glucose and amino acids
B. Secretion of hydrogen and potassium ions
C. Filtration of blood plasma
D. Concentration of urine by creating a medullary osmotic gradient
Answer: Option D
Solution (By JKSSB Mock Tests)
The Loop of Henle is a U-shaped tube extending into the renal medulla. Its primary function is to concentrate the urine by creating a hyperosmotic gradient in the medullary interstitium through the counter-current multiplier mechanism. The descending limb is permeable to water but not salts, while the ascending limb is impermeable to water but actively transports salts out. This gradient allows the collecting duct to reabsorb water under the influence of ADH.

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Practice More Biology Questions

Question #1
Consider statements about animal husbandry: 1. Poultry birds are reared for meat and eggs. 2. Dairy animals are reared for milk production. 3. Sericulture involves rearing honeybees. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 1 and 3 only

Correct Answer: Option C


Explanation:
Poultry farming involves the commercial rearing of birds, primarily chickens, for the production of meat (broilers) and eggs (layers). Dairy farming focuses on the breeding, rearing, and management of cattle, buffaloes, and other mammals for the production of milk and milk products. Sericulture is the rearing of silkworms (Bombyx mori) for silk production; the rearing of honeybees is called apiculture. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #2
The technique of growing plants under controlled conditions in a sterile medium is:
A. Cloning
B. Hydroponics
C. Genetic engineering
D. Tissue culture

Correct Answer: Option D


Explanation:
Tissue culture involves growing plant cells, tissues, or organs on a nutrient medium under aseptic conditions to produce clones or disease-free plants.

This question belongs to: Science Biology
Question #3
Which component of the blood transports oxygen and carbon dioxide?
A. Erythrocytes
B. Leukocytes
C. Plasma proteins
D. Thrombocytes

Correct Answer: Option A


Explanation:
Erythrocytes (red blood cells) contain hemoglobin, which binds oxygen (as oxyhemoglobin) and carbon dioxide (as carbaminohemoglobin). Leukocytes are immune cells, thrombocytes are platelets for clotting, and plasma proteins (e.g., albumin) maintain osmotic balance and transport some substances. The majority of CO₂ is carried as bicarbonate in plasma.

This question belongs to: Science Biology