Sunday, March 23, 2008
Time lapsed seeds growing
Radish seeds
Now it is time for you to observe your own seeds. What do you observe?
Yeast Balloon- Respiration produces carbon Dioxide
The purpose of any leavener is to produce the gas that makes bread rise. Yeast does this by feeding on the sugars in flour, and expelling carbon dioxide in the process.
While there are about 160 known species of yeast, Saccharomyces cerevisiae, commonly known as baker's yeast, is the one most often used in the kitchen. Yeast is tiny: Just one gram holds about 25 billion cells. That amount of fungi can churn out a significant amount of carbon dioxide, provided it has the simple sugars it uses as food. Fortunately, yeast can use its own enzymes to break down more complex sugars—like the granulated sugar in the activity below—into a form that it can consume.
We made a yeast-air balloon during one of our lessons. Here are some pictures captured during our activity. Enjoy!
Reproduction in Plants
Just a quick revision about helping plants grow well. Give it a try!
Learn about the different parts of a flower.
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