FIRST NAME _______________________ INITIAL ______

Put a circle around the number next to each correct answer.

I. Why doesn't the air remain still? The reason is that air, when it becomes heated, becomes lighter, and it rises. When it rises, other air moves in to take its place. The temperature of air becomes like the surface of the earth over which it travels. Over dry land, the air can become very hot. Then, when the sun goes down, it cools off quickly. Over water the air heats up more slowly and cools off more slowly. These changes cause the movement of air, which we call wind..

A. This story is mainly about -

1. air over dry land.

2. the heating up of air.

3. how air becomes lighter.

4. why air moves.

B. As air heats up, it -

1. cools off quickly.

2. becomes lighter.

3. becomes very hot.

4. blows gently.

C. Over dry land, the air -

1. heats up and cools off quickly.

2. only heats up quickly.

3. only cools off quickly.

4. is still.

D. Wind -

1. is the movement of air.

2. causes the air to heat up.

3. cools off more slowly.

4. is hotter over water.

II. What is the difference between a fruit and a vegetable? Well, we know that all fruits bear seeds. Think of an apple or an orange. However, squash, peppers, and tomatoes have seeds in them. Are they fruits? In a scientific sense, they are. However, you wouldn't want to eat them for dessert, as you would an apple or a pear. We don't call them fruits, because they are not sweet, even though, scientifically, they are fruits.

A. This story is mainly about -

1. foods that we eat for dessert.

2. the scientific definition of a fruit.

3. how fruits and vegetables are alike and different.

4. why we call some foods vegetables.

B. Scientifically, a fruit -

1. is the same as a vegetable.

2. is good for dessert.

3. bears seeds.

4. is a seed.

C. For dessert, people are likely to eat -

1. something sweet.

2. a vegetable.

3. something that bears seeds.

4. a strawberry or an orange.

D. Scientifically, examples of fruits are -

1. apples and beans.

2. spinach and potatoes.

3. lettuce and oranges.

4. strawberries and carrots.

III. Where does our warmth come from? We might think that warmth comes from clothes, but clothes can only keep the warmth that we already have from escaping into the air. Sometimes, it is true, we get warmth from something outside ourselves, such as the sun or a fire or a hot bath. However, we would be badly off if we had to depend on the sun, a fire, or a hot bath for warmth. The fact is, we make the warmth outselves, and it comes from our food. Our food is burned inside our bodies. Burning requires oxygen, which comes from the air that we breathe. Food and oxygen together burn to create warmth.

A. This story is mainly about -

1. food and oxygen.

2. keeping warmth inside.

3. the importance of burning inside our bodies to keep us warm.

4. the importance of the sun, a fire, or a hot bath.

B. Burning requires -

1. oxygen.

2. the sun.

3. food.

4. fire.

C. The oxygen in our bodies comes from -

1. food.

2. the sun.

3. fire.

4. air.

D. Clothes -

1. make warmth.

2. keep warmth from escaping.

3. are like the sun or fire.

4. require oxygen.

IV. Does a fish drink? All living things must drink, and they require a fresh supply of water often. A person can go without food for many days, but he or she cannot go for long without water. Fishes drink, and fishes that live in salt water must drink salt water. However, when we watch them in an aquarium and see them opening and closing their mouths, we must not assume that they are drinking. Fishes need water for its oxygen. The water that they seem to be gulping gives them oxygen, which is in the water. On the other hand, when a fish drinks, it swallows water, just as we do.

A. This story is mainly about -

1. drinking.

2. the need of a fish for oxygen.

3. a fish's uses of water.

4. why a fish gulps water.

B. A fish opens and closes its mouth -

1. in order to get oxygen.

2. to drink.

3. in order to gulp.

4. to swim in an aquarium.

C. A person -

1. can live for a long time without water.

2. can live for a long time without food.

3. has no need for food and water.

4. has no need for a fresh supply of water.

D. When fishes drink, -

1. they require fresh water.

2. they swallow water, just as we do.

3. they require salt water.

4. they drink water for its oxygen.

V. What do we mean when we speak of a calorie? Well, we know that the food that we eat is burned and provides heat. Some foods can provide much heat, and other foods, very little. The foods that provide much heat provide many calories. We measure the amount of heat a food provides in calories, just as we measure your height in inches or your weight in pounds. A calorie is a measure of the heat required to raise the temperature of one gram of water one degree centigrade. One calorie of food can also raise one pound of matter to a height of 40 inches. Two thousand calories a day of food in the body can provide a lot of heat and a lot of of work.

A. This story is mainly about -

1. calories.

2. heat and work.

3. measuring.

4. the differences in foods.

B. Calories -

1. are the same as heat and work.

2. are a measure of too much heat.

3. are the same as food.

4. are a measure of heat and work.

C. Oily foods provide a lot of calories. Therefore, we can say that -

1. oily foods provide a lot of heat and work.

2. oily foods must be avoided.

3. oily foods have too many calories.

4. oily foods provide very little heat.

D. One degree centigrade is a measure of -

1. water.

2. temperature.

3. weight.

4. one gram.