By Ethel Hanaauer
Cells, utilizing a microscope, plants, animals; seventy seven experiments contain growing to be protozoa, micro organism, development a terrarium, turning out to be seeds in a sponge, learning spider net formation, related fabric. approximately part the experiments require a microscope. Over a hundred illustrations
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Now, saturate both the blotting paper and the towelling with water. pour off the excess. Unless the blotting paper is kept moist, your seeds will not grow. Push four soaked seeds between the glass and blotting paper at the top of each jar. After the seedlings have grown an inch above the top of the jars, set one "tumbler garden" on its side. You will observe: The seeds will germinate. In less than a week they will grow into baby plants with green leaves. A few days after you have set one jar on its side, examine it.
Lay it flat on the plate and pour dilute iodine over it. After a few minutes pour off the iodine and wash the leaf again in tap water. Clean the plate. 37 You will observe: The leaf has become either greyish or completely without pigment. But after it was treated with dilute iodine, it turned blue-black. The alcohol in which the leaf was boiled has turned green. By boiling the leaf in alcohol, you removed its chlorophyll, or food-making substance. And later, when you treated it with dilute iodine, you tested it for the presence of starch.
Some oak leaves will be purple, others scarlet. The late fall leaves of all these trees will be dull, dry, brown and will fall apart or crumble easily. After a summer of manufacturing food, the chlorophyll bodies (chloroplasts) of green leaves die because they have completed their job. Excess food made during the summer is stored in the trunk and roots of the tree for use during winter. There are pigments other than green in most leaves, but they are hidden under the chlorophyll. However, when the green color dies, these other pigments show up.