Grade 9 Science Experiment 7 - The Colorful Properties of Capillaries - How Plants and Trees Gain Nourishment
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Purpose:
The purpose of this science fair project is to understand how capillaries work in foods such as celery. The stem of a stalk of celery contains tiny tubes called the capillaries. There is a scientific principle called "Capillary Action". Capillary Action is the tendency of liquids in tiny tubes to rise in the tubes. Capillary Action is possible because air pressure that presses on the liquid and the bottom of the celery stalk is greater than the air pressure inside of the stalk. The greater air pressure wins out and the liquid travels up the capillaries. The Capillary Action principle explains why trees and plants have roots. They feast on water and nutrients through their capillaries.
Hypothesis:
The pressure of liquid in a drinking glass will cause the liquid to fill the capillaries of the celery stalk. The drinking glass will act as the "ground" where roots of a plant or vegetable are usually found.
Variables:
- Amount of liquid
- Days of exposure of the celery stalk in the liquid
Materials Needed:
- Fresh stalk of celery
- Red food coloring
- Large drinking glass
- Water
- Plastic table knife
- Beets
- Red Cabbage
- Camera and film
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