Exercise

Fill in the blanks:

1. Earthworms breathe through their _____.

Ans: skin

2. When food is broken down, _____ and water are formed.

Ans: carbon dioxide

3. Anaerobic respiration results in the formation of carbon dioxide and ____.

Ans: ethyl alcohol

4. Insects have air holes called ____ that take in air.

Ans: spiracles

5. ____ are the breathing organs of plants.

Ans: Stomata

True or false:

1. The size of the chest cavity increases during inhalation.

Ans: True

2. Plants carry out photosynthesis only during the day and respiration only at night.

Ans: False

3. During heavy exercise the breathing rate of a person slows down.

Ans: True

4. Frogs breathe through their skins as well as their lungs.

Ans: True

5. The fishes have lungs for respiration.

Ans: False