Grade 3 Science Worksheet (Age 9) — Parts of Plants & Human Organs | 70 Questions | Cambridge-aligned

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Instructions

Read each question carefully and answer to the best of your ability. Try to answer all the questions in each section.

Part A: Objective Questions

Section 1: Multiple Choice

Circle the correct answer for each question.

  1. Which part of the plant absorbs water and nutrients from the soil?
    • A) Leaf
    • B) Stem
    • C) Root
    • D) Flower
  2. What is the main job of the human heart?
    • A) To think
    • B) To pump blood
    • C) To digest food
    • D) To help us breathe
  3. Which part of the plant makes food using sunlight?
    • A) Root
    • B) Fruit
    • C) Flower
    • D) Leaf
  4. The 'control center' of the human body is the:
    • A) Stomach
    • B) Lungs
    • C) Brain
    • D) Heart
  5. Which part of a plant holds it upright and carries water to the leaves?
    • A) Stem
    • B) Roots
    • C) Petals
    • D) Seeds
  6. When you breathe in, air fills your:
    • A) Intestines
    • B) Lungs
    • C) Stomach
    • D) Brain
  7. The colorful part of a plant that attracts insects is the:
    • A) Leaf
    • B) Root
    • C) Flower
    • D) Stem
  8. Where does the food you eat get mixed with acids and broken down?
    • A) Heart
    • B) Lungs
    • C) Brain
    • D) Stomach
  9. Which part of the plant often grows into a fruit?
    • A) The root
    • B) The leaf
    • C) The flower
    • D) The stem
  10. After the stomach, food travels to the:
    • A) Lungs
    • B) Intestines
    • C) Heart
    • D) Brain
  11. What do plants use to make their food during photosynthesis?
    • A) Water, soil, and darkness
    • B) Water, air, and sunlight
    • C) Sugar, water, and soil
    • D) Air, fruit, and moonlight
  12. The organ that allows you to think, feel, and remember is the:
    • A) Heart
    • B) Brain
    • C) Lungs
    • D) Stomach
  13. What part of the plant protects the seeds?
    • A) The leaf
    • B) The stem
    • C) The fruit
    • D) The root
  14. Which two organs work together when you breathe?
    • A) Heart and stomach
    • B) Brain and intestines
    • C) Lungs and brain
    • D) Stomach and intestines
  15. Which of these is NOT a main part of a plant?
    • A) Leaf
    • B) Stem
    • C) Bone
    • D) Root
Section 2: True or False

Write 'True' or 'False' next to each statement.

  1. The stomach pumps blood around the body. __________
  2. Roots grow upwards towards the sun. __________
  3. The brain is protected by the skull. __________
  4. All plants have flowers. __________
  5. The lungs take in oxygen from the air. __________
  6. The stem of a plant is always underground. __________
  7. The heart is a muscle. __________
  8. Leaves can be different shapes and sizes. __________
  9. The intestines help to digest food and absorb nutrients. __________
  10. Plants need darkness to make their food. __________
Section 3: Fill in the Blanks

Choose the correct word from the word bank to complete each sentence.

Word Bank: brain, leaves, stomach, heart, roots, flowers, lungs, stem, fruit, intestines
  1. The __________ holds the plant up and acts like a straw.
  2. Your __________ is the boss of your body, telling everything what to do.
  3. The __________ are like anchors that hold a plant in the ground.
  4. When you eat, food goes down into your __________ to be digested.
  5. The __________ are the parts of a plant that are often bright and colorful.
  6. You have two __________ that fill with air when you breathe in.
  7. The __________ of a plant make food using sunlight.
  8. After food leaves the stomach, it goes to the __________ to get more nutrients.
  9. A plant's __________ often holds the seeds.
  10. The __________ beats all day and night to move blood through your body.
Section 4: Matching

Draw a line to match the body part or plant part in Column A with its main job in Column B.

Column A Column B
1. Brain A. Makes seeds
2. Leaf B. Pumps blood
3. Heart C. Control center for the body
4. Lungs D. Makes food for the plant
5. Flower E. Takes in oxygen

Part B: Short Answer Questions

Write your answer in one or two complete sentences.

  1. What are two main jobs of a plant's roots?
  2. Why are most leaves green?
  3. What is the main function of the human stomach?
  4. How do your lungs help your body?
  5. What job does the flower have for a plant?
  6. What does your heart do?
  7. Name two things a plant needs to grow well.
  8. Where is your brain located and what protects it?
  9. What does the stem of a plant do?
  10. What happens to food inside the small intestine?
  11. Why do plants need sunlight?
  12. Name one thing you can do to keep your heart healthy.
  13. What part of a plant usually turns into a fruit?
  14. Why is the brain often called the 'control center'?
  15. Name a plant part that we can eat.
  16. What gas do we breathe in that our bodies need?
  17. How does a fruit help a plant reproduce?
  18. What two organs are found inside your chest?
  19. What is the job of the large intestine?
  20. Name all five main parts of a plant.

Part C: Problem Solving

Read the situations and use what you know to answer the questions.

  1. If you forget to water a plant for two weeks, its leaves start to droop and turn brown. Which part of the plant is not getting what it needs to do its job, and why does this affect the leaves?
  2. Leo just ran a race. He is breathing very fast and his heart is beating quickly. Why are his lungs and heart working so hard?
  3. A gardener notices that the flowers on his tomato plant have all fallen off, but no tomatoes are growing. Why might this be a problem?
  4. Why is it very important to wear a helmet when you ride a scooter or a bicycle? Which organ are you protecting?
  5. A plant is put in a box with no windows, but it is given plenty of water. Will it grow well? Explain why or why not.
  6. If a person eats a very large meal, they might feel full and tired. Which organ is working very hard to break down all that food?
  7. You see a tall tree with a very thick, strong stem (a trunk). What does this thick stem tell you about its job for the tree?
  8. A doctor uses a stethoscope to listen to a patient's chest. What two important organs is the doctor checking?
  9. Imagine the intestines are like a very long, curly hose. Why do you think they need to be so long?
  10. If a plant's stem is cut, why is this a big problem for the leaves and flowers above the cut?

Answer Key

Part A: Objective Questions

Section 1: Multiple Choice
  1. C) Root
  2. B) To pump blood
  3. D) Leaf
  4. C) Brain
  5. A) Stem
  6. B) Lungs
  7. C) Flower
  8. D) Stomach
  9. C) The flower
  10. B) Intestines
  11. B) Water, air, and sunlight
  12. B) Brain
  13. C) The fruit
  14. C) Lungs and brain
  15. C) Bone
Section 2: True or False
  1. False
  2. False
  3. True
  4. False
  5. True
  6. False
  7. True
  8. True
  9. True
  10. False
Section 3: Fill in the Blanks
  1. stem
  2. brain
  3. roots
  4. stomach
  5. flowers
  6. lungs
  7. leaves
  8. intestines
  9. fruit
  10. heart
Section 4: Matching
  1. 1 -> C
  2. 2 -> D
  3. 3 -> B
  4. 4 -> E
  5. 5 -> A

Part B: Short Answer Questions

  1. The roots anchor the plant in the soil and absorb water and nutrients.
  2. Leaves are green because they contain a substance called chlorophyll, which helps them make food.
  3. The stomach's main function is to break down food with acids and muscles.
  4. Lungs help the body by taking in oxygen from the air and removing carbon dioxide.
  5. The flower's job is to make seeds so the plant can reproduce.
  6. The heart pumps blood to all parts of the body, delivering oxygen and nutrients.
  7. A plant needs water and sunlight to grow well. (Also accept: soil, air, space).
  8. The brain is located inside the head and is protected by the skull.
  9. The stem supports the plant and transports water and nutrients from the roots to the leaves.
  10. In the small intestine, food is broken down further and nutrients are absorbed into the body.
  11. Plants need sunlight as energy to make their own food (photosynthesis).
  12. To keep your heart healthy, you can exercise or eat healthy foods.
  13. The flower (specifically the ovary) usually turns into a fruit after pollination.
  14. The brain is called the 'control center' because it controls everything the body does, from moving to thinking.
  15. We can eat plant parts like roots (carrots), leaves (lettuce), stems (celery), or fruits (apples). (Any one example is correct).
  16. We breathe in a gas called oxygen.
  17. A fruit helps a plant by protecting the seeds and helping them spread to new places.
  18. The heart and lungs are found inside the chest.
  19. The large intestine absorbs water from the remaining food waste.
  20. The five main parts of a plant are roots, stem, leaves, flowers, and fruit.

Part C: Problem Solving

  1. The roots are not getting the water they need. This affects the leaves because the stem cannot transport water up to them, and leaves need water to stay healthy and make food.
  2. His lungs are working hard to get more oxygen into his body, and his heart is beating fast to pump that oxygen-rich blood to his tired muscles.
  3. This is a problem because tomatoes (the fruit) grow from the flowers. If there are no flowers, no fruit can develop.
  4. It is important to protect your brain. The helmet acts like a hard shell to keep the skull and the brain safe from injury if you fall.
  5. No, it will not grow well. Even with water, a plant needs sunlight to make its food through photosynthesis. Without light, it will become weak and yellow.
  6. The stomach is working very hard. It has to use its muscles and acids to churn and digest all the food.
  7. The thick stem's job is to provide strong support for a very large and heavy tree, and to transport a lot of water up to all its leaves.
  8. The doctor is checking the heart (listening for the heartbeat) and the lungs (listening for clear breathing sounds).
  9. The intestines need to be very long to give them enough time and surface area to absorb all the important nutrients from the food we eat.
  10. It is a big problem because the stem is like a highway for water and nutrients. If it's cut, the water from the roots cannot reach the leaves and flowers, and they will wilt and die.
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