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GROW PLANTS IN DIFFERENT HEAT CONDITIONS Let's see how warm plants like to be. We have three pots with potting soil, and some seeds. We can use about any kind of seeds we want, just so they are all the same, and we should plant two or three seeds in each pot. Of course, we will label the pots, and the labels will tell what kind of seeds, the date we planted them, and what conditions of heat they will have. ("Hot," "Cold," and "Normal.") The "Normal" pot will be placed on the counter near the window. We can put the "Cold" pot into the refrigerator, or we can put it onto some dry ice. (It would be too difficult to keep one in regular ice cubes, because they melt, and we would just have to drain off the water and put in fresh cubes.) The "Hot" pot will be put very near the heater. If we do this experiment at the time of year when we aren't using the heater, we'll get a lamp to put by the plant, or even a heating pad, if we make sure the pad doesn't get water on it. Do you know what a thermometer (pronounced "ther-mom-it-ter") is? It is an instrument that measures heat and cold. Some- times when you get sick, your mom or the doctor will take your temperature (pronounced "tem-per-a-tyoor") with a thermometer, to see if you have a fever. Sometimes when you come into the house from outside and you are shivering, you might say, "Wow! How cold is it out there?" Mom could look out the window at the thermometer, and say, "It is really cold! It's only 28 degrees." There are many different kinds of thermometers, for several purposes. We have three thermometers here and we'll put one onto the soil in each pot. On our lists, we will copy the labels of the pots, and beside each label, we will write the tempera- ture of each pot. When the soil in the pot labeled "Normal" gets dry on top, we will water all three plants, using the same amount of water for each one. We'll make a note of the dates we see green on each pot, and as they grow, we will measure them. Then, we can decide if plants like to be hot, cold, or normal. We can do the same experiment in soilless gardens, to see how heat and cold affects germination and root growth. I think the soilless garden made with jars and paper towels would be best.  Any problems with this page? Send URL to
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