Excretory System Quiz Worksheets - Free Printable

Let's go through the Excretory System Quiz step by step and solve each question with explanations.

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1. The kidneys make sure the body has just enough of this.

- A. salt
- B. waste
- C. liquid
- D. bladder

✔ Correct Answer: A. salt

Explanation: The kidneys regulate the balance of electrolytes (like sodium or salt) in the body. They help maintain homeostasis by adjusting how much salt is retained or excreted in urine.

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2. The excretory system rids the body of this type of waste.

- A. salt
- B. abdomen
- C. liquid
- D. kidney

✔ Correct Answer: C. liquid

Explanation: The main waste product removed by the excretory system is urine, which is a liquid containing metabolic wastes like urea, excess ions, and water.

> Note: While "waste" might seem logical, the best answer here is liquid because the system specifically removes liquid waste (urine).

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3. The kidneys remove excess water and substances from the blood and turn it into this.

- A. solid
- B. urine
- C. urinary
- D. ureters

✔ Correct Answer: B. urine

Explanation: The kidneys filter blood, reabsorb useful substances, and excrete waste and excess fluids as urine.

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4. The digestive system is responsible for ridding the body of this type of waste.

- A. solid
- B. liquid
- C. salt
- D. waste

✔ Correct Answer: A. solid

Explanation: The digestive system processes food and eliminates solid waste (feces). The excretory system handles liquid waste (urine), so this is a key distinction.

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5. All living things eliminate this.

- A. ureters
- B. ureters
- C. urine
- D. kidney

✔ Correct Answer: C. urine

Explanation: All living organisms must remove metabolic waste products. In animals, this often includes urine, though the exact form varies (e.g., ammonia, urea, uric acid). So, urine is a general term for nitrogenous waste in many organisms.

> Note: The options are poorly worded — “ureters” appears twice. But since “urine” is the only correct biological waste product listed, that’s the best choice.

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6. The three main organs of the excretory system are the 2 kidneys, the bladder, and the 2 ________.

- A. abdomen
- B. urinary
- C. liquid
- D. ureters

✔ Correct Answer: D. ureters

Explanation: The ureters are tubes that carry urine from the kidneys to the bladder. There are two ureters — one from each kidney.

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7. This is the main organ of the excretory system.

- A. urinary
- B. ureters
- C. bladder
- D. kidney

✔ Correct Answer: D. kidney

Explanation: The kidneys are the primary organs of the excretory system. They filter blood, produce urine, and regulate fluid and electrolyte balance.

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8. The excretory system is also called this system.

- A. kidney
- B. urinary
- C. salt
- D. abdomen

✔ Correct Answer: B. urinary

Explanation: The urinary system is another name for the excretory system, especially in humans, because it deals with the formation and elimination of urine.

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9. The organs of the excretory system are located here.

- A. liquid
- B. waste
- C. abdomen
- D. bladder

✔ Correct Answer: C. abdomen

Explanation: The kidneys, ureters, bladder, and urethra are all located in the abdominal cavity (specifically, the kidneys are in the retroperitoneal space, and the bladder is in the pelvic cavity — both part of the abdomen region).

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10. This organ acts as a storage tank for the urine that is made by the kidneys.

- A. bladder
- B. solid
- C. liquid
- D. solid

✔ Correct Answer: A. bladder

Explanation: The bladder stores urine until it is ready to be expelled from the body via the urethra.

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✔ Final Answers:

| Question | Answer |
|--------|--------|
| 1 | A. salt |
| 2 | C. liquid |
| 3 | B. urine |
| 4 | A. solid |
| 5 | C. urine |
| 6 | D. ureters |
| 7 | D. kidney |
| 8 | B. urinary |
| 9 | C. abdomen |
| 10 | A. bladder |

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📝 Summary:

This quiz tests basic understanding of the human excretory system, focusing on:
- Organs involved (kidneys, ureters, bladder)
- Functions (filtering blood, removing waste, regulating fluids)
- Differences between excretory and digestive systems
- Terminology (urine, urinary system, etc.)

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