Obtain watermelon seeds, an egg carton and planting soil. Have the children spoon planting soil into each section of the egg carton and plant a seed in the soil. Have them water and check their seed daily. They will soon see a small watermelon plant emerge from the soil.
Help children separate cereal by color. Cut a paper plate in half and punch a small hole at the top of the rounded edge of one half of the plate. Thread a piece of string through the hole and tie it for hanging. Help children glue a row of each color of fruit loops onto the paper plate starting from the top of the rounded edge of the plate. After the glued cereal dries onto the plate, turn the plate over and glue strips of colored streamers along the cut edge of the plate so that they hang vertically.
Fill a large plastic water or soda bottle a quarter of the way full with water. Add a small drop of blue food coloring and a tiny drop of liquid dish soap to the water. Have the children help you insert a handful of fish gravel or clean sand into the bottle. Blow up and release most of the air out of two small balloons and tie them at the ends. Let the children drop the balloons into the bottle. Tightly screw on the bottle cap and show children how to rock their fish tank back and forth and hold it sideways to see the "fish" swim.
During the spring or fall, help children find a caterpillar and place it in a jar. Put a stick in the jar and fill it with leaves for food from the area where you found the caterpillar. Keep a fresh supply of leaves in the jar for the caterpillar to eat. Once the caterpillar has gone into a cocoon, put a moist cotton ball in the jar. Caterpillars need water to hatch into butterflies or moths. Spring caterpillars take about a month to hatch while fall caterpillars hatch the following spring. Help children release the butterfly or moth once it has hatched.