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Grade 7 · Science · Unit 5 of 14

How Plants Work

Roots, leaves, flowers and photosynthesis

What your child practises

The parts of seed plants and what they do, photosynthesis, gas exchange, transpiration and pollination, and how plant structures suit where a plant grows.

Alberta Curriculum learning outcome: Unit B: Plants for Food and Fibre · the structure and life processes of seed plants and how they suit their environment

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

    Which plant is best suited to a very dry, windy field?

    • One that needs flooded soil
    • One with wide, thin leaves and shallow roots
    • One with deep taproots and narrow leaves
    • One that needs shade all day
    Show answer

    One with deep taproots and narrow leaves

    Hint: Deep roots reach water and narrow leaves lose less of it.

  2. Question 2

    A dandelion has one thick, deep root that goes straight down. What kind of root is this?

    • A stem root
    • A flower root
    • A taproot
    • A fibrous root
    Show answer

    A taproot

    Hint: A taproot is a single main root; a fibrous root system is a mass of thin roots.

  3. Question 3

    Which tubes in a stem carry water up from the roots?

    • Petals
    • Stomata
    • Xylem
    • Phloem
    Show answer

    Xylem

    Hint: Xylem moves water up. Phloem carries sugar around the plant.

  4. Question 4

    On a hot, dry day, many plants close their stomata. What does this do?

    • Makes more roots grow
    • Speeds up photosynthesis
    • Lets more pollen in
    • Saves water, but slows photosynthesis
    Show answer

    Saves water, but slows photosynthesis

    Hint: Closed stomata lose less water but also take in less carbon dioxide.

  5. Question 5

    What is the job of tiny root hairs?

    • To catch sunlight
    • To attract insects
    • To take in water and minerals from the soil
    • To make seeds
    Show answer

    To take in water and minerals from the soil

    Hint: Root hairs give the root a larger surface for absorbing water.

  6. Question 6

    What happens during pollination?

    • A seed grows into a seedling
    • Roots take in water
    • Pollen is moved to the female part of a flower
    • Leaves make sugar
    Show answer

    Pollen is moved to the female part of a flower

    Hint: Bees, wind and other animals can carry pollen.

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