NCERT solution for class 7 || Science || Chapter 10 -Respiration in organisms

 NCERT solution  >Class 7 > Science 

NCERT solution for class 7   || Science  || Chapter 10 -Respiration in organisms

 Chapter 10- Respiration in organisms 

Exercise -  

Q1. Why does an athlete breathe faster and deeper than use one after finishing the race? 

Answer- Because during the running the muscles of the athlete needs more energy and breathing faster and deeper  more oxygen reaches to the cell and it increases the rate of energy released 

Q2. List the similarities and differences between aerobic and anaerobic respiration? 

Answer-  Similarities - during both respiration the food is break down into energy 

Differences in aerobic and anaerobic respiration 


Q3. Why do we often sneeze when we inhale a lot of dust Laden air?  

Answer- Sneezing expel the foreign particles from the inhaled air. When we inhaled a lot of dust particle then it create irritation in nasal passage . And these unwanted dust particles causes sneezing

Q4. Three test tubes fill three fourth of each with water label them A ,B and C keep a snail in test tube A a water plant in test tube B and in C gives snail and plant both which test tube would have the highest concentration of CO2 

Answer -

1. In test tube only snail is present so it take oxygen for breathing and exhale CO2 

2. In second test tube only water plant is there so it take oxygen for respiration but released oxygen during the process of photosynthesis 

3. In 3rd test tube both water plant and snail is present snail take Oxygen and release carbon dioxide while that released carbon dioxide is taken by the water plant for the photosynthesis 

Show in test tube A the concentration of carbon dioxide is more

Q5. Tick the correct answer 

a) In cockroaches air enters the body through 

    i) lungs  ii) Gills  iii) spiracles    iv) skin 

b) During heavy exercise we get cramps in the legs due to the accumulation of .

    i) carbon dioxide     ii) lactic acid    iii) alcohol iv)  water 

c) Normal range of breathing rate per minute in an average adult person at rest is 

    i) 9 -12    ii) 15 -18    iii) 21- 24.     iv) 30 -33 

d) During exhalation the ribs 

    i)  to move downward ii) move upward   iii) move outward iv) do not move at all 

Q6. Match day terms in column I with those in column II 

        Column I.                    Column II 

              a) Yeast                 Earthworm 

            b) Diaphragm.            Gills 

            c) Skin                     Alcohol 

            d) Leaves                 chest cavity 

            e) Fish                     stomata 

            f) Frog                     lungs and skin 

                                            Trachea 

Answer-  

                Column A                      Column B 

                     a) Yeast                     Alcohol 

                    b) Diaphragm          Chest cavity 

                    c) skin                     Earthworm 

                    d) leaves                 Stomata 

                    e) fish                     Gills 

                     f) frog                 lungs and skin

Q7. Mark T if the statement is true and F if it is false   

i) during heavy exercise the breathing rate of a person slow down 

ii) plants carry out photosynthesis only during the day and respiration only at night 

iii) frogs breathe through their skin as well as their lungs 

iv) the fishes have lungs for respiration 

v) the size of the chest cavity increases during inhalation 

Answer- 

i) false 

ii) false 

iii) true 

iv) false 

v) true 

Q8. Given below is the square of letters in which are hidden different words related to respiration in organisms these words may be present in any direction upward down the word or along the diagonals find the words for your respiratory system to use about those words are given below the square 

i) the air tubes of insects .

ii) skeletal structures surround chest cavity 

iii) muscular floor of chest cavity 

iv) tiny pores on the surface of the leaf 

v) small opening on the sides of the body of an insect 

vi) the respiratory organs of human beings 

vii) The opening through which we inhale 

viii) an anaerobic organism 

ix) an organism with tracheal system 


Answer-   



i) Trachea 

ii) Ribs 

iii) Diaphragm 

iv) Stomata 

v) Spiracles 

Vii) Lungs 

viii) Nostrils 

ix) Yeast 

Q9 . The mountaineers carry oxygen with them because 

a) At an altitude of more than 5 km there is no air 

b) athe amount of air available to the person is less than that available on the ground. 

c) The temperature of air is higher than that on the ground 

d) The pressure of air is higher than that of the ground 

Answer- b) The amount of air available to the person is less than that available on the ground. 




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