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Science · Grades 3–5

Growing plants: questions and evidence

Change the factor being tested and keep other relevant conditions as similar as possible.

Make a worksheet

Understand the idea

Keep comparisons fair

Change the factor being tested and keep other relevant conditions as similar as possible.

Use several plants

One unusually healthy or damaged seedling can mislead a comparison.

Examples and reasoning

Two groups of similar seedlings receive different amounts of light. What is deliberately changed?

light exposure

light exposure

To test light exposure, which should usually be kept similar?

plant type and watering

plant type and watering

Check your understanding

  1. A pupil records plant height every morning. Which is the measured outcome?

    1. pupil name
    2. pot label
    3. question title
    4. height

  2. A seedling grows from 4 cm to 11 cm. What is the increase in cm?

  3. Why use several plants in each condition?

    1. to guarantee the preferred result
    2. to remove the need to measure
    3. to reduce the influence of an unusual individual
    4. to change every variable

  4. A pot receives more water and more light than another. Why is interpretation difficult?

    1. There are two pots.
    2. The pots need names.
    3. Two factors changed at once.
    4. Plants cannot be measured.

Answers and marking notes

Answers and marking notes
  1. height

    height

  2. 7

    11 − 4 = 7

  3. to reduce the influence of an unusual individual

    to reduce the influence of an unusual individual

  4. Two factors changed at once.

    Two factors changed at once.

Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.