Science Fair Projects
biologymedium middle 10 days

Do Plants Need Sunlight to Grow? Light Deprivation Science Project

This experiment investigates the importance of sunlight for plant growth. Students will compare the growth of plants kept in light versus those kept in darkness.

Do Plants Need Sunlight to Grow? Light Deprivation Science Project

Hypothesis

If plants are kept in the dark, then they will grow slower than those kept in sunlight.

Materials Needed

small potted plants4Buy
dark box or closet1Buy
measuring tape1Buy
wateras neededBuy
notebook1Buy
labeling markers1Buy

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Step-by-Step Procedure

  1. 1

    Place two plants in a sunny area and two plants in a dark box.

  2. 2

    Water all plants equally at the same time.

  3. 3

    Label each plant to identify its group.

  4. 4

    Measure the height of each plant daily.

  5. 5

    Record observations about leaf color and overall health.

  6. 6

    Continue monitoring for 1-2 weeks.

  7. 7

    At the end of the period, compare the growth of the plants.

  8. 8

    Analyze your data and conclude whether sunlight is necessary.

Expected Results

Plants exposed to sunlight should grow taller and healthier compared to those kept in the dark, which may show stunted growth.

Variables

Independent Variable

Light exposure (sunlight vs. darkness)

Dependent Variable

Growth of the plants (height and health)

Controlled Variables

Type of plants, Amount of water, Temperature of the environment

Safety Notes

Handle plants carefully to avoid allergies; ensure the dark box is well-ventilated.

Presentation Tips

  • Use a chart to compare plant heights.

  • Include photos of plants in both conditions.

  • Discuss the role of photosynthesis.

  • Practice clear explanations for your results.

  • Prepare to answer questions about your findings.

Frequently Asked Questions

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