NEET Biology: Osmoregulation Practice Questions
11 free multiple-choice questions on Osmoregulation (Excretory Products and their elimination) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. If a cell is placed in a solution that has a lower solute concentration than the cell's cytoplasm, the cell will tend to:
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Correct answer: A — Turgid (swell)
When a cell is placed in a hypotonic solution (lower external solute concentration), water moves into the cell via osmosis, causing the cell to swell or become turgid.
Q2. Which organ is primarily responsible for the regulation of water balance and the excretion of excess water in the human body?
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Correct answer: D — Kidneys
The kidneys are the main excretory organs responsible for filtering blood and regulating the volume and concentration of urine, thus managing water balance.
Q3. Which of the following correctly describes the movement of water across a selectively permeable membrane in a hypertonic solution?
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Correct answer: A — Water moves from the region of higher solute concentration to the region of lower solute concentration.
Osmosis is the net movement of water across a selectively permeable membrane from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration).
Q4. Which of the following terms describes a solution that has a lower solute concentration than the cell interior?
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Correct answer: D — Hypotonic
A hypotonic solution has a lower solute concentration than the cell interior, causing water to move into the cell.
Q5. In a hypotonic solution, what happens to a cell placed in it?
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Correct answer: A — It gains water and swells
In a hypotonic solution (lower solute concentration outside), water moves into the cell, causing the cell to swell or burst.
Q6. A solution with a higher concentration of dissolved salts compared to the body's blood is classified as:
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Correct answer: C — Hypertonic
A solution with a higher solute concentration than the body's internal fluids is hypertonic, causing water to move out of the blood cells (dehydration).
Q7. The excretory system in humans primarily deals with the elimination of which soluble waste product in the form of urine?
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Correct answer: B — Urea
Urea is the principal nitrogenous waste product formed during the breakdown of amino acids in the liver, and it is eliminated through the renal system as urine.
Q8. In a plant cell placed in a hypertonic solution, what will happen to the cell?
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Correct answer: D — It will shrink or become flaccid
When a plant cell is placed in a hypertonic solution, water moves out of the cell into the solution, causing the cell to lose volume and become flaccid.
Q9. When a fish is placed in fresh water (hypotonic environment), what occurs to its body?
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Correct answer: B — It gains water and swells
Fish in freshwater face a tendency to gain water via osmosis, requiring active mechanisms to excrete excess water and retain salts.
Q10. Which structure is primarily responsible for osmoregulation in humans?
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Correct answer: D — Kidneys
The kidneys are the primary organs responsible for regulating the water and solute balance (osmoregulation) in the body.
Q11. In the context of osmoregulation in animals, the primary role of the kidneys is to maintain the balance of which substance in the blood?
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Correct answer: A — Water
The primary function of the kidneys in maintaining homeostasis is the regulation of water balance and solute concentration in the blood (osmoregulation).
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