Grade 3 Science Worksheets for 8-Year-Olds: Plants, Human Organs & Matter

Free worksheet covering multiple subjects for age 8 students. Created with Learning Corner's AI-powered tools.

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Instructions

Read each question carefully and write your answers in the spaces provided. Have fun exploring science!

Part 1: Plant Power!

A. Label the Plant Parts
Read the description and write the correct plant part from the word bank.

Word Bank: Flower     Stem     Leaf     Roots

  1. I grow underground and soak up water and nutrients from the soil. I am the                     .
  2. I use sunlight to make food for the plant. I am usually green. I am a                     .
  3. I am often colorful and pretty. I help the plant make seeds and fruits. I am the                     .
  4. I am like a tall straw. I carry water from the roots to the leaves and help the plant stand up straight. I am the                     .

B. What Do Plants Need?
Fill in the blanks with what a plant needs to grow strong and healthy.

To grow, a plant needs light from the ________________________, clean ________________________ to drink, fresh ________________________ to breathe, and ________________________ to get its nutrients.


C. Light and Temperature
Circle the correct word to finish the sentence.

  1. A plant placed in a dark closet will grow ( better / worse ) than a plant in a sunny window.
  2. Most plants will grow better in a place that is too ( hot / cold ) instead of just right. Uh oh, that's a trick question! Plants like temperatures that are not too hot and not too cold!

Part 2: Your Amazing Body!

D. Organ Match-Up
Draw a line to match the organ to its important job.

Organ Job
1. Brain A. Helps your body use the good parts of food.
2. Lungs B. It is the control center for your whole body; it thinks!
3. Heart C. It mashes and mixes your food with digestive juices.
4. Stomach D. Pumps blood all around your body.
5. Intestines E. They fill with air when you breathe in.

Part 3: What's the Matter?

E. Solid, Liquid, or Gas?
Read the list below. Write S for Solid, L for Liquid, or G for Gas next to each item.

  • A glass of milk: _____
  • A brick: _____
  • Steam from a kettle: _____
  • A pencil: _____
  • Air inside a party balloon: _____
  • Apple juice: _____

F. Mix and Separate!
How would you separate these mixtures? Choose the best method from the box.

Methods: Hand-picking     Sieve     Filter Paper

  1. A mix of big rocks and small pebbles: ________________________
  2. A mix of sand and water: ________________________
  3. A mix of colorful beads and marbles: ________________________

G. Soluble or Insoluble?
If something is soluble, it dissolves in water. If it is insoluble, it does not. Read the sentences and circle the correct word.

  1. You stir sugar into your lemonade and it disappears! Sugar is ( soluble / insoluble ).
  2. You drop a small rock into water and it just sinks to the bottom. The rock is ( soluble / insoluble ).



Answer Key

Part 1: Plant Power!

A. Label the Plant Parts

  1. Roots
  2. Leaf
  3. Flower
  4. Stem

B. What Do Plants Need?
To grow, a plant needs light from the sun, clean water to drink, fresh air to breathe, and soil to get its nutrients.

C. Light and Temperature

  1. worse
  2. (Trick question, but the point is made that extremes are bad)

Part 2: Your Amazing Body!

D. Organ Match-Up
1. B
2. E
3. D
4. C
5. A

Part 3: What's the Matter?

E. Solid, Liquid, or Gas?

  • A glass of milk: L
  • A brick: S
  • Steam from a kettle: G
  • A pencil: S
  • Air inside a party balloon: G
  • Apple juice: L

F. Mix and Separate!

  1. Sieve
  2. Filter Paper
  3. Hand-picking

G. Soluble or Insoluble?

  1. soluble
  2. insoluble
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