Excretion Practice Questions
NECO (Nigeria) · NECO Biology · 135 free MCQs with instant results and detailed explanations.
135
Total
38
Easy
66
Medium
31
Hard
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Sample Questions from Excretion
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which organ in the human body is primarily responsible for the excretion of urea?
A.
Kidney
B.
Liver
C.
Lungs
D.
Skin
Show Answer & Explanation
Correct Answer: A
The kidneys are the main organs responsible for filtering blood and excreting urea, a waste product from protein metabolism, through urine.
Q2
Easy
What process do the kidneys use to remove waste from the blood?
A.
Diffusion
B.
Filtration
C.
Osmosis
D.
Evaporation
Show Answer & Explanation
Correct Answer: B
Filtration is the primary process by which the kidneys remove waste from the blood, specifically in the glomeruli of the nephrons.
Q3
Easy
Which organ in the human body is primarily responsible for the excretion of urine?
A.
Kidney
B.
Liver
C.
Lungs
D.
Skin
Show Answer & Explanation
Correct Answer: A
The kidney is the main organ responsible for filtering blood to produce urine, which contains waste products that the body needs to excrete.
Q4
Medium
Which organ in the human body is primarily responsible for the filtration of blood and formation of urine?
A.
Kidney
B.
Liver
C.
Lungs
D.
Heart
Show Answer & Explanation
Correct Answer: A
The kidney is the primary organ responsible for filtering blood and producing urine, removing waste and excess substances from the body.
Q5
Medium
In the process of excretion, which substance is primarily removed from the body through urine?
A.
Oxygen
B.
Carbon Dioxide
C.
Urea
D.
Glucose
Show Answer & Explanation
Correct Answer: C
Urea is a primary waste product formed from the breakdown of proteins and is mainly excreted in urine, making it the correct answer.
Q6
Medium
How does the skin contribute to the process of excretion in humans?
A.
By producing bile
B.
By filtering blood
C.
By secreting sweat
D.
By absorbing nutrients
Show Answer & Explanation
Correct Answer: C
The skin contributes to excretion by secreting sweat, which contains water, salts, and small amounts of metabolic waste, thus aiding in waste removal.
Q7
Medium
Which part of a nephron is responsible for the reabsorption of water and solutes back into the blood?
A.
Glomerulus
B.
Bowman's capsule
C.
Loop of Henle
D.
Proximal convoluted tubule
Show Answer & Explanation
Correct Answer: D
The proximal convoluted tubule is primarily responsible for reabsorbing water, ions, and nutrients back into the bloodstream, making it the correct choice.
Q8
Hard
Which of the following correctly describes the role of the nephron in the excretion process?
A.
The nephron filters blood, reabsorbs necessary substances, and secretes waste into the urine.
B.
The nephron only filters blood and does not participate in reabsorption.
C.
The nephron converts waste directly into energy for the body to use.
D.
The nephron's primary function is to produce red blood cells.
Show Answer & Explanation
Correct Answer: A
The nephron is the functional unit of the kidney, responsible for filtering blood, reabsorbing essential nutrients, and secreting waste products into the urine, which is critical for maintaining homeostasis.
Q9
Hard
In humans, which nitrogenous waste is primarily excreted in urine, and what process mainly produces it?
A.
Urea, produced from the deamination of amino acids in the liver.
B.
Uric acid, resulting from the breakdown of carbohydrates.
C.
Ammonia, excreted directly without conversion.
D.
Creatinine, derived from muscle metabolism of glucose.
Show Answer & Explanation
Correct Answer: A
Urea is the main nitrogenous waste excreted in urine, produced through the process of deamination of amino acids in the liver, which is necessary for detoxifying ammonia in the body.
Q10
Hard
Which of the following statements correctly describes the role of nephrons in the excretion process?
A.
Nephrons filter blood, reabsorb water and electrolytes, and secrete waste into urine.
B.
Nephrons only filter blood, with no role in reabsorption or secretion.
C.
Nephrons produce red blood cells and filter toxins from the blood.
D.
Nephrons dissolve all waste products into the blood for excretion.
Show Answer & Explanation
Correct Answer: A
Option A is correct because nephrons are the functional units of the kidney responsible for filtering blood, reabsorbing essential substances like water and electrolytes, and secreting waste products into urine, which is vital for maintaining homeostasis.
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Excretion — NECO (Nigeria) NECO Biology Practice Questions Online
This page contains 135 practice MCQs for the chapter Excretion in NECO (Nigeria) NECO Biology. The questions are organized by difficulty — 38 easy, 66 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.