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Scoil Naomh Fionán Rennies, Belgooly, Co. Cork
Scoil Naomh Fionán Rennies, Belgooly, Co. Cork
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Investigating the Effect of Light on Seed Growth

Equipment:

  • Cress seeds
  • Plastic trays
  • Small shoe box
  • Artificial light source
  • Compost
  • Lollipop sticks
  • Water

Method:

1.Plant seeds as per instructions.

2.Water all trays.

3.Put trays into different types of light and label as below:

  1. Tray in shoe box with a hole at the side.
  2. Tray put in room with artificial light.
  3. Tray half covered with card.
  4. Tray on windowsill in full light.
  5. Tray in cupboard with no light.

Predictions:

A.I think the cress will move up to the sun.

  1. It won’t grow at all.

C .The part not covered will grow.

  1. It will grow fully.
  2. It will not grow at all.

Results:

  1. The cress grew towards the window in the box. The cress was light green and grew sideways towards the light/5cm.
  2. B. The cress grew the tallest (7cm) to try find light (very leggy). Sickly yellow /green colour.
  3. C. The half that was in the light had dark green leaves and the half under the cardboard was light green and the stems bent towards the light.
  4. Very healthy growth (lush) dark green coloured leaves (3/4cm).
  5. E. Very long stems (6/7cm) but leaves were yellow not green.

Conclusion:

Our investigation showed that seeds germinate without light but seedlings need real sunlight to grow properly and photosynthesize to make their own food.