Science Experiments for Kids

Spring Science – Cress Caterpillar

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This is our cress caterpillar. You can see in the photo that 3 of the segments are a lighter shade of green than the other three. Can you guess why this might be?

How to grow a cress caterpillar

  • cress seeds
  • an egg box, cut into segments
  • water

cress caterpillar


Cress Caterpillar Instructions

  • Place some cress seeds in each segment of the egg box.
  • Place 3 segments on one plate or tray and 3 on another plate or tray.
  • Add water to all, and place one plate on a windowsill and one in the dark.
  • Water frequently.

The cress should grow within a few days. I did give my ‘in the dark seeds’ a little bit of light to help them grow which is why they are slightly green.

Why are the cress leaves green?

I was very surprised that the seeds grew so well without any soil. They got everything they needed to grow from the water and nutrients stored in the seed.

Green plants make sugar for growth by a process called photosynthesis.

Carbon dioxide + water  (and light ) ———> glucose and oxygen

Photosynthesis takes place in choroplast cells which contain a substance called chlorophyll which makes plants green.

Sunlight is also needed to make chlorophyll, this is why the cress seeds which have been exposed to less sunlight are less green than the seeds kept in the sun.

 

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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