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Grade 3 · Science · Unit 1 of 10

Plant Parts & Needs

Roots, stems, leaves, flowers and what plants need

What your child practises

Roots, stems, leaves, flowers (with the stamen and pistil), fruit, seeds and cones, plus what plants need to live: air, water, light, heat, nutrients and space.

Ontario Curriculum expectation: B2.1, B2.2 · the basic needs of plants, and the parts of plants and what each part does

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Is it above the ground or below the ground? Tap an item, then tap its basket.

    Sort into: ☀️ above ground · 🕳️ below ground

    • 🌱radish (a root)
    • 🌱root hairs
    • 🌳tree roots
    • 🌿stem
    • 🍎fruit
    • 🌼flower
    Show answer

    ☀️ above ground: stem, fruit, flower · 🕳️ below ground: radish (a root), root hairs, tree roots

    Hint: Roots grow down in the soil. Stems, leaves, flowers and fruit grow up in the air.

  2. Question 2

    A seed has a hard coat. What does it do?

    🌰
    • makes pollen
    • protects the baby plant inside
    • catches sunlight
    • drinks water for the plant
    Show answer

    protects the baby plant inside

    Hint: The seed coat keeps the tiny plant safe until it is ready to sprout.

  3. Question 3

    A tree's roots spread out far under the ground. How does that help the tree?

    🌳
    • it makes more leaves
    • it lets the tree fly seeds
    • it keeps the tree warm
    • it takes in lots of water and stays upright in wind
    Show answer

    it takes in lots of water and stays upright in wind

    Hint: Long roots collect water and anchor a big tree against wind.

  4. Question 4

    Which part of a flower makes pollen?

    🌼
    • the stamen
    • the stem
    • the petal
    • the pistil
    Show answer

    the stamen

    Hint: The stamen makes the yellow pollen. The pistil is in the middle of the flower.

  5. Question 5

    Which part of a plant holds it up and carries water to the leaves?

    🌿
    • the stem
    • the seed
    • the flower
    • the roots
    Show answer

    the stem

    Hint: The stem is like a straw with a frame around it. It holds the plant up and carries water.

  6. Question 6

    Leaves have tiny openings. What do they let in?

    🍃
    • soil
    • rocks
    • air (carbon dioxide)
    • seeds
    Show answer

    air (carbon dioxide)

    Hint: Leaves take in a gas from the air called carbon dioxide.

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