8542RB Reading for Me Level 5 Part A

Factual
Colour-changing Celery
Hypothesis:
I predict that the pieces of celery will change colour to match the
food colouring because the celery will suck up the water.
Equipment:
• Food colouring (red, blue and yellow)
• 450 ml cold water
• 3 sticks of celery with leaves • Goggles
• 3 clear vases, measuring cylinders or test tubes
• Pipette • Measuring jug • Apron
Method:
1. Put your goggles and apron on.
2. Pour 150 ml of cold water into each vase.
3. Use the pipette to add precisely three drops of food colouring to
each vase, making sure to use a different colour for each vase.
4. Add a stick of celery to each vase and wait for an hour or more—
the longer, the better.
5. Observe what has happened to the celery.
Results:
Conclusion:
The yellow food colouring is not a strong enough colour, so it is
difficult to see a change. The celery leaves in the red- and bluecoloured
water have changed colour, showing how the water has
travelled to all parts of the plant.
Next time I would like to try different colours, such as purple.
42 Reading for Me Level 5 (Part A) 978-1-922843-64-7 R.I.C. Publications ® Prim-Ed Publishing