By Ethel Hanaauer
Cells, utilizing a microscope, vegetation, animals; seventy seven experiments contain becoming protozoa, micro organism, development a terrarium, starting 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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To provide this, their body cells secrete the hard protective substances we call shells. Crabs and crayfish shed their outgrown shells as their bodies grow larger and produce new and larger shells to fit as neededOn the other hand, clams, oysters, mussels and snails do not leave their shells as they grow. Their bodies secrete new cells to add to the original ones and more shell material to add to their size. " This term designates a stage in the development of a crab. All over the world the sea animals you have collected are valued as a source of food.
Observe first under low power of your microscope, and then under high power. You will observe: Small openings appearing at intervals. Each opening is encircled by two kidney-shaped cells. 39 These tiny openings are the stomates, through which a leaf takes in carbon dioxide from the air. There are about half a million stomates on an average sized leaf. Each is controlled by two "guard" cells that regulate the size of the opening, depending upon how much carbon dioxide the leaf needs. The guard cells close the opening to prevent the escape of water when the soil is dry due to lack of rain.
Using the method you just learned in studying how a green leaf produces food, boil the chlorophyll out of the leaf. ) Now, place the boiled leaf in a dish and test it for starch with dilute iodine. Be sure you wash off the excess iodine solution. You will observe: The part of the leaf that originally was green became blue-black. The part of the leaf that originally was white remained without pigment. Only leaves or parts of leaves that contain chlorophyll are active in photosynthesis. Therefore, the white part of the leaf you tested did not contain starch, proof that it was not part of the plant's food-making factory.