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Answer key

Chapter: 06. Excretory System

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Practice Exam Paper: The Human Excretory System

Grade: 7 ​Subject: Biology ​Time Allowed: 1.5 Hours
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Section A: Multiple Choice Questions (MCQs)

Choose the correct option for each of the following questions:
Where is urea produced from ammonia and carbon dioxide in the human body? (a) Kidneys (b) Urinary bladder © Liver (d) Lungs
What percentage of human urine is composed of water? (a) 2.5% (b) 50% © 75% (d) 95%
Who is recognized as the “Father of Artificial Organs” for inventing the first artificial heart and kidney? (a) Willem Johan Kolff (b) Bowman © E. coli (d) None of the above
Which bacterium is commonly responsible for causing Urinary Tract Infections (UTIs)? (a) Lactobacillus (b) E. coli © Streptococcus (d) Amoeba
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Section B: Fill in the Blanks

Fill in the blanks using the exact term(s). Use ‘_ _ _ _ _ _ _ _ _ _ _ _ _ _’ for the blank space.
The process of maintaining water balance and salt concentration in the blood is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ .
The kidneys are highly efficient, cleaning all the blood in our body once every _ _ _ _ _ _ _ _ _ _ _ _ _ _ minutes.
Each nephron has a cup-shaped anterior end called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ .
The opening of the urethra is controlled by a ring of circular involuntary muscles called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ .
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Section C: True or False

State whether the following statements are True or False. If false, write the correct form of the statement.
Small kidney stones located in the ureters can be easily removed by drinking a large amount of water.
Sweat glands excretory products include bile pigments, toxins, and carbon dioxide.
The presence of sugar in urine indicates that the pancreas is not functioning normally and the person may have diabetes.
Ureters are long, coiled tubes located inside the kidneys that act as the primary filters of blood.
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Section D: Explanations of Terms

Explain the following terms in one or two sentences based on the text:
Ultrafiltration
Metabolic wastes
Dialysis
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Section E: Differentiate the Concepts

Distinguish between the following pairs of concepts:
Waste Products vs. Excretory Products
Ureter vs. Urethra
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Section F: Diagram-Based Questions

A diagram showing the human urinary system including kidneys, ureters, urinary bladder, and urethra.
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Based on the diagram description above, answer the following questions:
Identify the anatomical parts labeled A, B, C, and D.
State the primary function of the part labeled C.
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Section G: Short Answer Questions

Answer the following questions briefly:
Why do white patches sometimes form on colored clothes in the underarm area during summer?
Explain the role of the liver in preparing nitrogenous wastes for excretion.
What are the common symptoms of a Urinary Tract Infection (UTI)?
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Section H: Long Answer Questions

Answer the following questions in detail:
Describe the three distinct processes involved in the formation of urine within the kidneys.
Why is excretion vital for the survival of living cells? Explain what happens to the cells if toxic metabolic wastes accumulate.
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