All the plants were given good soil and enough water. The plants on the windowsill and the plants outside in the open grew well. The plants outside in the bags turned yellow and grew badly. The plants in the closet died.
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Answer:
a. A scientist has 12 plants. All the plants were the same kind and about the same size. He put three plants on a windowsill inside a room. He put another three plants in a closet without a light. He put another three more plants outside on the ground. He put his last three plants outside too, but covered them with paper bags that had wholes punched in them for air. All the plants were given good soil and enough water. The plants on the windowsill and the plants outside in the open grew well. The plants outside in the bags turned yellow and grew badly. The plants in the closet died. Which of the following is the best hypothesis based on the facts?
a) Green plants turn yellow due to disease.
b) Green plants don’t live for very long.
c) Green plants need light to grow.
d) Green plants cannot grow inside
e) Green plants grow well in closets.
b. Louis Pasteur, a famous scientist who lived over 100 years ago, made an important hypothesis about a certain germ called bacteria. He noticed that bacteria grew quickly in open jars of liquid, like chicken soup. Bacteria also grew in jars of soup that were sealed tightly so that no air could get in. However they didn’t grow in soup that was sealed tightly in a jar, then boiled and kept sealed after it cooled. What was Pasteur’s correct hypothesis?
f) Bacteria cannot grow in jars.
g) Bacteria must have air to survive
h) Bacteria only grow in chicken soup
i) Bacteria can be killed by boiling.
j) Bacteria can live in boiling liquids.