Class 7 Science Chapter 6 Practice Question Answers - Respiration in Organisms

Q1. A film of moisture of appears on the surface of the mirror when we:
(a) inhale
(b) exhale
(c) breathe
(d) none of these
Ans: (b)
A film of moisture appears on the surface of the mirror when we exhale.

Q2. The vital biological process of organisms is:
(a) inspiration
(b) respiration
(c) transpiration
(d) evaporation
Ans: (b)
The vital biological process of organisms is respiration.

Q3. The mountaineers carry oxygen with them because:
(a) At an atitude of more than 5 km there is no air
(b) The amount of air available to a 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 on the ground
Ans: (b)
The mountaineers carry oxygen with them because the amount of air available to a person is

less than that available on the ground.

Q4. We feel hungry after a physical activity because we need:
(a) oxygen
(b) energy
(c) food
(d) none of these
Ans: (b)
We feel hungry after a physical activity because we need energy.

Q5. A person can hold air in the lungs is:
(a) 50 ml
(b) 5000 ml
(c) 500 ml
(d) 0.5 ml
Ans: (c)
A person can hold air in the lungs is 500 ml.

Q6. The percentage of oxygen in exhaled air is:
(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 0.04%
Ans: (c)
The percentage of oxygen in exhaled air is 16.4%

Q7. The percentage of oxygen in inhaled air is:
(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 21%
Ans: (d)
The percentage of oxygen in inhaled air is 21%

Q8. The percentage of CO2 in inhaled air is:
(a) 0.04%
(b) 21%
(c) 16.4%
(d) 4.4%
Ans: (a)
The percentage of carbon dioxides in inhaled air is 0.04%

Q9. The respiratory organs of human beings are:
(a) lungs and skin
(b) lungs
(c) gills
(d) skin
Ans: (b)
The respiratory organs of human beings are lungs.

Q10. The process of respiration leads to the release of energy in:
(a) plants
(b) animals
(c) human beings
(d) all of these
Ans: (a)
The process of respiration leads to the release of energy in plants.

Q11. The absorb oxygen dissolved in water:
(a) frog
(b) fish
(c) earthworm
(d) butterfly
Ans: (b)
The fish absorb oxygen dissolved in water.

Q12. The respiratory organ of birds are:
(a) mouth
(b) gills
(c) wet skin
(d) lungs
Ans: (d)
The respiratory organ of birds are lungs.

Q13. Air exhaled:
(a) has no moisture
(b) has more amount of oxygen
(c) has moisture
(d) has less amount of carbon dioxide
Ans: (c)
Air exhaled has moisture.

Q14. After exercise:
(a) respiration rate increases
(b) respiration rate decreases
(c) respiration rate remains same
(d) none of these
Ans: (a)
After exercise respiration rate increases.

Q15. Air enters the lungs when:
(a) diaphragm is lowered
(b) diaphragm is pushed upwards
(c) diaphragm remains at its place
(d) none of these
Ans: (a)
Air enters the lungs when diaphragm is lowered.

Q16. Roots take up air from the air spaces present between the:
(a) root hair
(b) soil particles
(c) both (a) and (b)
(d) none of these
Ans: (b)
Roots take up air from the air spaces present between the soil Particles.

Q17. If a potted plant is over watered, the roots will:
(a) grow
(b) die
(c) dry
(d) none of these
Ans: (b)
If potted plant is over watered, the roots will die.

Q18. The rate of exchange of gases in plants is not as fast as in:
(a) animals
(b) insects
(c) birds
(d) human beings
Ans: (a)
The rate of exchange of gases in plants is not as fast as in animals.

Q19. Insects have small openings on the outside of their bodies. These openings are called:
(a) spiracles
(b) trachea
(c) gills
(d) none of these
Ans: (a)
Insects have small openings on the outside of their bodies, is called spiracles.

Q20. Exchange of gases take place through small openings on the surface of the leaves are called:
(a) spiracles
(b) stomata
(c) trachea
(d) none of these
Ans: (b)
Exchange of gases take place through small openings present on the surface of leaves calledstomata.

Q21. The process of intake of oxygen and exhalation of carbon dioxide is:
(a) breathing rate
(b) breathing
(c) respiration
(d) none of these
Ans: (b)
The process of intake of oxygen and exhalation of carbon dioxide is breathing.

Q22. Ribs move down and inward to decrease space in chess cavity during:
(a) inhalation
(b) exhalation
(c) respiration
(d) transportation
Ans: (b)
Ribs move down and inwards to decrease space in chest cavity during exhalation.

Q23. In Cockroaches air enters the body through:
(a) lungs
(b) gills
(c) spiracles
(d) skin
Ans: (c)
In cockroaches air enters the body through spiracles.

Q24. During heavy exercise, we get cramps in legs due to accumulation of:
(a) carbon dioxide
(b) lactic acid
(c) alcohol
(d) water
Ans: (b)
During heavy exercise, we get cramps in legs due to accumulation of carbon dioxide

Q25. Normal range of breathing rate per minute in an average adult person at rest is:
(a) 9-12
(b) 15-18
(c) 21-24
(d) 30-33
Ans: (b)
Normal breathing rate per minute in an average adult person is 15-18

Q26. During exhalation the ribs:
(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all
Ans: (b)
During exhalation, the ribs move downwards.

Q27. During inhalation the ribs:
(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all
Ans: (c)
During inhalation the ribs move upwards.

Q28. In fish air enters the body through:
(a) lungs
(b) gills
(c) spiracles
(d) skin
Ans: (b)

In fish air enters the body through gills.

Q29. Earthworm respires through
(a) lungs
(b) gills
(c) spiracles
(d) skin
Ans: (d)
Earthworm respires through skin.

Q30. The energy giving process is
(a) respiration
(b) transpiration
(c) evaporation
(d) none of these
Ans: (a)
The energy giving process is respiration.