Respiration in Organisms Question Answer DAV Class 7

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Something to know

A. Fill in the blanks. 

1. Lactic acid is produced during anaerobic respiration. 

2. Insects have organs, called Trachea, for respiration. 

3. Taking in of air, rich in oxygen, called inspiration. 

4. An adult human being normally breathes from 14 to 20 times per minute. 

5. The movement of lungs is controlled by the ribcage and the diaphragm. 

6. Haemoglobin acts as the respiratory carrier in our body. 

B. Match the following

1. Lactic acid -                  Muscle cramps

2. Stomata -                       Transpiration

3. Respiratory carrier - Haemoglobin

4. Lenticles -                   Pores or branches

 5. Alcohol -                   Fermentation of yeast

C. Tick (√) the correct option

1. Respiration helps in

Ans. (d) obtaining energy

2. Stomata performs the function of 

Ans. (c) Exchange of gases

3. The process represented by the following equation, ( glucose + oxygen = Carbon dioxide + water + energy) 

Ans. (d) Is aerobic respiration

4. To survive, plants root need 

Ans. (b) oxygen

5. Earthworms and leeches respire through their

Ans. (d) Skin

D. Answer the following questions in brief. 

1. Define respiration. Name the two types of respiration. 

Ans. The process of oxidizing the food to produce energy by a living being is called respiration. Two types of respiration are : 

i)Aerobic Respiration 

ii)Anaerobic Respiration

2. Name the respiratory organ of the following : (a) crab  , (b) man, (c) leech, (d) an insect

Ans. (a) Crab - gills, (b) man - Lungs (c) leech - Skin, (d) an insect - trachea

3. Define transpiration. 

Ans. Loss of water vapour through stomata in plants is called transpiration. 

4. Define the term ' breathing rate? 

Ans. The number of breathings per minute is called breathing rate. 

5. Name the body organs which help lungs during the process of breathing. 

Ans. Diaphragm and ribs

6. Why do we need to breathe out carbon dioxide? 

Ans. Carbon dioxide is a harmful gas. It can prove lethal if it accumulates in the body. Hence, we need to breathe out carbon dioxide. 

E. Answer the following questions. 

1. Why do we get muscle cramps after heavy exercise. 

Ans. Anaerobic respiration also happen in our muscles, when there is extra demand of energy by the muscle cells. When we do heavy exercise, our muscles need more energy. Anaerobic respiration happens in the muscle cells to provide extra energy. Aa a result of this, lactic acid is released in muscles. Due to lactic acid, we get muscle cramps. 

2. Why does a potted plant die when over watered?

Ans. When a plant is over watered, it needs to get rid of excess water through  transpiration. But the rate of transpiration may not be able to remove excess water. Due to this, an over watered plants usually dies. 

3. Where are stomata found in a plant? State their function. 

Ans. Stomata are present on the surface of leaves. Exchange of gases happens through stomata. 

5. Draw a neat, well - labelled diagram of the human respiratory system. 

Ans.  See page no. 108

6. Describe an activity to show that exhaled air contains carbon dioxide. 

Ans. For this, take a test tube and fill it with freshly prepared lime water. Take a drinking straw in your mouth and blow air through this in lime water. You will notice that the lime water turns milky. This happens because of carbon dioxide. This shows that exhaled air contains carbon dioxide. 

7.  Describe the changes that take place in (I) around the ribcage (ii) diaphragm (iii) chest cavity , during inspiration. State the effect of this changes. 

Ans. The ribcage is lifted upwards, the diaphragm os lowered and the chest cavity  expands. With these changes, lungs also expand. Expansion of lungs results in air moving inside the lungs. 

Value Based Question

It was time for the 400 m race in the annual athletic meet of the school. Shweta who was tipped to win the race, maintained a clear lead over others till about 30 m from the finishing line. She then felt cramps in her legs but did not give up. She quickly took some deep and fast breaths and continued running. Her presence of mind, determination, courage and positive attitude, helped her to just manage to win race. Rita and Neetu, who finished second and third, respectively, we're the first to congratulate her on her success. 

1. State the values displayed by Sweta. 

Ans. Determination, courage, presence of mind and a hunger to excel. 

2. Write about 'some situation in which you, or one of your friends, displayed a behavior similar to that of Rita and Neetu. 

Ans. It was a singing competition in our school. Ankit is a very good singer. But he came second second in the competition because in the competition because Rohan proved to be a better singer on that day. But Ankut was unfazed. He moved to the stage and congratulate Rohan for winning the first prize. 

3. State the likely reason due to which Shweta felt cramps in her legs. 

Ans. Shweta was running too fast . Her leg muscles needed more energy. For this anaerobic respiration began in her leg muscles. This resulted in accumulation of lactic acid in her leg muscles. This caused cramps in her legs. 

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