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## Let Us Revise Match the following: | Column A | Column B | | -------------- | ------------- | | Amoeba | Moist skin | | Fishes | Stomata | | Ants | Lungs | | Earthworms | Cell membrane | | Cockroaches | Gills | | | Spirac...

## Let Us Revise Match the following: | Column A | Column B | | -------------- | ------------- | | Amoeba | Moist skin | | Fishes | Stomata | | Ants | Lungs | | Earthworms | Cell membrane | | Cockroaches | Gills | | | Spiracles | ### Key Terms * **Respiration:** Inhalation and exhalation of air to draw in oxygen and to remove carbon dioxide from the body. * **Respiration:** The use of oxygen to break down food to release energy. * **Respiration:** Respiration in the presence of oxygen. * **Respiration:** Respiration in the absence of oxygen. * **Number of breaths in one minute**: ### Exercises **A. Choose the correct option.** 1. The chemical process involving oxidation of food to release energy is called: * a. Cellular respiration 2. Which of the following is true about yeast? * a. Respiration takes place in the presence of oxygen. 3. Which of the following will be produced in the muscle cells of a person who is cycling? * a. Oxygen 4. Tubes through which air enters into the lungs are called: * a. Bronchi **B. Give one word answer for the following.** 1. Taking in oxygen and giving out carbon dioxide. 2. The pigment in the blood that helps carry oxygen. 3. Small opening present on the body of insects for gaseous exchange. 4. Reaction of digested food in the presence of oxygen in living cells. 5. Tubes that branch out from the trachea and enter each lung. **C. Short answer questions** 1. How is breathing different from respiration? 2. What is the difference between external and internal respiration? 3. What are the products of anaerobic respiration? Give examples 4. Why do we breathe faster during physical exercises? 5. What happens when we over-exercise plants? 6. Explain the path of oxygen during respiration.