The excretory system worksheet for Grade 3 - Free Printable

Let’s go step by step to solve this worksheet.

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Part 1: Drag the words to fill in the blanks

We are given these word choices:
- kidneys
- urine
- urethra
- bladder
- ureters

Now let’s read the paragraph and fill in each blank logically:

> The urinary system removes waste from our body in the form of urine.
*(That’s what we pee out — so “urine” fits here.)*

> The urinary system is made up of different organs. The kidneys filter waste from blood and produce urine.
*(Kidneys are the filters — they clean your blood and make urine.)*

> The ureters carry urine from the kidneys to the bladder.
*(Ureters are the tubes that move urine down to the storage bag — the bladder.)*

> The bladder stores the urine. The urethra carries urine from the bladder to the outside of the body.
*(Urethra is the final tube that lets urine leave your body.)*

✔ So the filled-in paragraph should be:

The urinary system removes waste from our body in the form of urine. The urinary system is made up of different organs. The kidneys filter waste from blood and produce urine. The ureters carry urine from the kidneys to the bladder. The bladder stores the urine. The urethra carries urine from the bladder to the outside of the body.

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Part 2: Choose True or False

1. The excretory system filters waste from blood.
→ TRUE. That’s exactly what the kidneys do — they clean your blood by removing waste.

2. The bladder is part of the excretory system.
→ TRUE. The bladder holds urine before it leaves the body — so yes, it’s part of the system.

3. Urine is stored in the kidneys.
→ FALSE. Urine is made in the kidneys, but stored in the bladder. Kidneys don’t store — they filter and send urine away.

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Part 3: Write the parts of the excretory system (based on the diagram)

Looking at the labeled diagram:

- Label ① points to the tube coming from the kidney → that’s the ureter
- Label ② points to the bean-shaped organ → that’s the kidney
- Label ③ points to the storage sac → that’s the bladder
- Label ④ points to the exit tube → that’s the urethra

So the answers are:

1. ureter
2. kidney
3. bladder
4. urethra

*(Note: Sometimes people list them as “kidneys, ureters, bladder, urethra” — order may vary, but labels match these parts.)*

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Final Answer:

Fill-in-the-blanks:
urine, kidneys, ureters, bladder, urethra

True/False:
1. True
2. True
3. False

Diagram labels:
1. ureter
2. kidney
3. bladder
4. urethra