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Respiration in Organisms Class 7 MCQs Questions with Answers
Solving Respiration in Organisms Multiple Choice Questions of Class 7 Science Chapter 10 MCQ can be of great help to students as they will be aware of all the concepts. These MCQ Questions on Respiration in Organisms Class 7 with answers pave for a quick revision, thereby helping you learn more about this subject.
Question 1.
A film of moisture of appears on the surface of the mirror when we:
(a) inhale
(b) exhale
(c) breathe
(d) none of these
Answer
(b) exhale
A film of moisture appears on the surface of the mirror when we exhale.
Question 2.
The vital biological process of organisms is:
(a) inspiration
(b) respiration
(c) transpiration
(d) evaporation
Answer
(b) respiration
The vital biological process of organisms is respiration.
Question 3.
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
Answer
(b) The amount of air available to a person is less than that available on the ground
The mountaineers carry oxygen with them because the amount of air available to a person is less than that available on the ground.
Question 4.
We feel hungry after a physical activity because we need:
(a) oxygen
(b) energy
(c) food
(d) none of these
Answer
(b) energy
We feel hungry after a physical activity because we need energy.
Question 5.
A person can hold air in the lungs is:
(a) 50 ml
(b) 5000 ml
(c) 500 ml
(d) 0.5 ml
Answer
(c) 500 ml
A person can hold air in the lungs is 500 ml.
Question 6.
The percentage of oxygen in exhaled air is:
(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 0.04%
Answer
(c) 16.4%
The percentage of oxygen in exhaled air is 16.4%
Question 7.
The percentage of oxygen in inhaled air is:
(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 21%
Answer
(d) 21%
The percentage of oxygen in inhaled air is 21%
Question 8.
The percentage of CO2 in inhaled air is:
(a) 0.04%
(b) 21%
(c) 16.4%
(d) 4.4%
Answer
(a) 0.04%
The percentage of carbon dioxides in inhaled air is 0.04%
Question 9.
The respiratory organs of human beings are:
(a) lungs and skin
(b) lungs
(c) gills
(d) skin
Answer
(b) lungs
The respiratory organs of human beings are lungs.
Question 10.
The process of respiration leads to the release of energy in:
(a) plants
(b) animals
(c) human beings
(d) all of these
Answer
(a) plants
The process of respiration leads to the release of energy in plants.
Question 11.
The absorb oxygen dissolved in water:
(a) frog
(b) fish
(c) earthworm
(d) butterfly
Answer
(b) fish
The fish absorb oxygen dissolved in water.
Question 12.
The respiratory organ of birds are:
(a) mouth
(b) gills
(c) wet skin
(d) lungs
Answer
(d) lungs
The respiratory organ of birds are lungs.
Question 13.
Air exhaled:
(a) has no moisture
(b) has more amount of oxygen
(c) has moisture
(d) has less amount of carbon dioxide
Answer
(c) has moisture
Air exhaled has moisture.
Question 14.
After exercise:
(a) respiration rate increases
(b) respiration rate decreases
(c) respiration rate remains same
(d) none of these
Answer
(a) respiration rate increases
After exercise respiration rate increases.
Question 15.
Air enters the lungs when:
(a) diaphragm is lowered
(b) diaphragm is pushed upwards
(c) diaphragm remains at its place
(d) none of these
Answer
(a) diaphragm is lowered
Air enters the lungs when diaphragm is lowered.
Question 16.
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
Answer
(b) soil particles
Roots take up air from the air spaces present between the soil Particles.
Question 17.
If a potted plant is over watered, the roots will:
(a) grow
(b) die
(c) dry
(d) none of these
Answer
(b) die
If potted plant is over watered, the roots will die.
Question 18.
The rate of exchange of gases in plants is not as fast as in:
(a) animals
(b) insects
(c) birds
(d) human beings
Answer
(a) animals
The rate of exchange of gases in plants is not as fast as in animals.
Question 19.
Insects have small openings on the outside of their bodies. These openings are called:
(a) spiracles
(b) trachea
(c) gills
(d) none of these
Answer
(a) spiracles
Insects have small openings on the outside of their bodies, is called spiracles.
Question 20.
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
Answer
(b) stomata
Exchange of gases take place through small openings present on the surface of leaves called stomata.
Question 21.
The process of intake of oxygen and exhalation of carbon dioxide is:
(a) breathing rate
(b) breathing
(c) respiration
(d) none of these
Answer
(b) breathing
The process of intake of oxygen and exhalation of carbon dioxide is breathing.
Question 22.
Ribs move down and inward to decrease space in chess cavity during:
(a) inhalation
(b) exhalation
(c) respiration
(d) transportation
Answer
(b) exhalation
Ribs move down and inwards to decrease space in chest cavity during exhalation.
Question 23.
In Cockroaches air enters the body through:
(a) lungs
(b) gills
(c) spiracles
(d) skin
Answer
(c) spiracles
In cockroaches air enters the body through spiracles.
Question 24.
During heavy exercise, we get cramps in legs due to accumulation of:
(a) carbon dioxide
(b) lactic acid
(c) alcohol
(d) water
Answer
(b) lactic acid
During heavy exercise, we get cramps in legs due to accumulation of carbon dioxide
Question 25.
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
Answer
(b) 15-18
Normal breathing rate per minute in an average adult person is 15-18
Question 26.
During exhalation the ribs:
(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all
Answer
(b) move downwards
During exhalation, the ribs move downwards.
Question 27.
During inhalation the ribs:
(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all
Answer
(c) move upwards
During inhalation the ribs move upwards.
Question 28.
In fish air enters the body through:
(a) lungs
(b) gills
(c) spiracles
(d) skin
Answer
(b) gills
In fish air enters the body through gills.
Question 29.
Earthworm respires through
(a) lungs
(b) gills
(c) spiracles
(d) skin
Answer
(d) skin
Earthworm respires through skin.
Question 30.
The energy giving process is
(a) respiration
(b) transpiration
(c) evaporation
(d) none of these
Answer
(a) respiration
The energy giving process is respiration.
Question 31.
Which disease is linked to smoking ?
(a) malaria
(b) cholera
(c) typhoid
(d) lung cancer
Answer
(d) lung cancer
Lungs Cancer is linked to smoking.
Question 32.
The air tubes present in insects are:
(a) spiracles
(b) trachea
(c) gills
(d) none of these
Answer
(b) trachea
The air tubes present in insects are trachea
Question 33.
The reason of cramps in legs is:
(a) acetic acid
(b) hydrochloric acid
(c) lactic acid
(d) trachea
Answer
(c) lactic acid
The reason of cramps in legs is lactic acid.
Question 34.
In mammals the respiratory organ is:
(a) gills
(b) spiracles
(c) trachea
(d) lungs
Answer
(d) lungs
In mammals the respitory organ is lungs.
Question 35.
Which one of the following is an anaerobic organism ?
(a) yeast
(b) crow
(c) ant
(d) dog
Answer
(a) yeast
Yeast is anaerobic organism.
Question 36.
The percentage of carbon dioxide in exhaled air is:
(a) 0.4%
(b) 4.4%
(c) 14.4%
(d) 44%
Answer
(b) 4.4%
The percentage of carbon dioxide in exhaled air is 4.4%
Question 37.
The size of chest cavity increases during:
(a) respiration
(b) inhalation
(c) transpiration
(d) none of these
Answer
(b) inhalation
The size of chest cavity increases during inhalation.
Question 38.
Frogs breathe through their skin as well as:
(a) gill
(b) lungs
(c) chest
(d) none of these
Answer
(b) lungs
Frogs breathes through their skin as well as lungs.
Question 39.
The end products of anaerobic respiration are:
(a) ethyl alcohol
(b) carbon dioxide
(c) both (a) and (b)
(d) none of these
Answer
(c) both (a) and (b)
The end products of anaerobic respiration are both CO2 and Ethyl Alcohol
Question 40.
The end products of an aerobic respiration are:
(a) carbon dioxide
(b) water and energy
(c) both (a) and (b)
(d) none of these
Answer
(c) both (a) and (b)
The end products of anaerobic respiration are both CO2 and water and energy.
Question 41.
These organisms survive in absence of air are known as:
(a) aerobic
(b) an aerobic
(c) earthworm
(d) none of these
Answer
(b) an aerobic
Those organisms survive in absence of air are known as an aerobic.
Question 42.
Respiration taking place in cells is:
(a) breathing
(b) cellular respiration
(c) transpiration
(d) evaporation
Answer
(b) cellular respiration
Respiration taking place in cells is cellular respiration.
Question 43.
The muscles of legs can be relieved by:
(a) massaging
(b) running
(c) exercising
(d) sleeping
Answer
(a) massaging
The muscles of legs can be relieved by massaging
Question 44.
A large muscular sheet farming the floor of chest cavity is:
(a) ribs
(b) trachea
(c) stomata
(d) diaphragm
Answer
(d) diaphragm
A large muscular sheet farming the floor of chest cavity is called diaphragm.
Question 45.
The size of chest cavity decreases during:
(a) inhalation
(b) breathing
(c) exhalation
(d) respiration
Answer
(c) exhalation
The size of chest cavity decreases during exhalation.
Question 46.
Which part of nose prevents the passage of smoke dust inside the body:
(a) hair
(b) nosal cavity
(c) nostrils
(d) none of these
Answer
(a) hair
Hair of nose prevents the passage of smoke, dust inside the body.
Match the column A with column B:
Question 1.
| Column-A | Column-B |
| (a) Yeast | (i) Stomata |
| (b) Diaphragm | (ii) Earthworm |
| (c) Skin | (iii) Chest cavity |
| (d) Leaves | (iv) Alcohol |
Answer
| Column-A | Column-B |
| (a) Yeast | (iv) Alcohol |
| (b) Diaphragm | (iii) Chest cavity |
| (c) Skin | (ii) Earthworm |
| (d) Leaves | (i) Stomata |
Question 2.
| Column-A | Column-B |
| (a) Fish | (i) Spiracles |
| (b) Frog | (ii) Lungs |
| (c) human beings | (iii) Lungs and skin |
| (d) Cockroaches | (iv) Gills |
Answer
| Column-A | Column-B |
| (a) Fish | (iv) Gills |
| (b) Frog | (iii) Lungs and skin |
| (c) human beings | (ii) Lungs |
| (d) Cockroaches | (i) Spiracles |
Question 3.
| Column-A | Column-B |
| (a) The air tubes of insects | (i) Stomata |
| (b) Skeletal structures surrounding chest cavity | (ii) Diaphragm |
| (c) Muscular floor of chest cavity | (iii) Ribs |
| (d) Tiny pores on the surface of leaf | (iv) Trachea |
Answer
| Column-A | Column-B |
| (a) The air tubes of insects | (iv) Trachea |
| (b) Skeletal structures surrounding chest cavity | (iii) Ribs |
| (c) Muscular floor of chest cavity | (ii) Diaphragm |
| (d) Tiny pores on the surface of leaf | (i) Stomata |
Question 4.
| Column-A | Column-B |
| (a) An anaerobic organism | (i) Lungs |
| (b) Small openings on the sides of the body of on insect | (ii) Nostrils |
| (c) The respiratory organs of human beings | (iii) Spiracles |
| (d) The openings through which we inhale | (iv) Yeast |
Answer
| Column-A | Column-B |
| (a) An anaerobic organism | (iv) Yeast |
| (b) Small openings on the sides of the body of on insect | (iii) Spiracles |
| (c) The respiratory organs of human beings | (i) Lungs |
| (d) The openings through which we inhale | (ii) Nostrils |
State the following statements are True or False:
Question 1.
Smoking damages lungs.
Answer
True
Question 2.
During heavy exercise the breathing rate of a person slows down.
Answer
False
Question 3.
Plants carry out photosynthesis only during the day and respiration only at night.
Answer
False
Question 4.
Frogs breathe through their skin as well as lungs.
Answer
True
Question 5.
The fish have lungs for respiration.
Answer
False
Question 6.
The size of chest cavity increases during inhalation.
Answer
False
Question 7.
Air enters the lungs when diaphragm is pushed upwards.
Answer
False
Question 8.
The respiratory organ of earthworm is wet skin.
Answer
True
Question 9.
Air exhaled has moisture.
Answer
True
Question 10.
The respiratory organ of birds is mouth.
Answer
False
Question 11.
The end products of aerobic respiration are carbon dioxide and water.
Answer
True
Question 12.
The fish absorbs oxygen dissolved in water.
Answer
True
Question 13.
Roots takes up air from the air spaces present between the soil.
Answer
True
Question 14.
Breathing is a biochemical process.
Answer
False
Question 15.
Enzymes are involved in respiration.
Answer
True
Question 16.
The ribs upwards during exhalation.
Answer
False
Question 17.
Normal rate of breathing per minute in an average adult person at rest is 15-18.
Answer
True
Question 18.
During heavy exercise, we get cramps in the legs due to the accumulation of alcohol.
Answer
False
Question 19.
In cockroaches, air enters the body through spiracles.
Answer
True
Question 20.
Tracheal system is found in insects.
Answer
True
Question 21.
Yeast is an anaerobic organism.
Answer
True
Question 22.
Cold water bath gives relief from cramps.
Answer
False
Question 23.
Lung is main respiratory organ of mammals i.e. man, dog, elephant etc.
Answer
True
Question 24.
Anaerobic respiration is harmless.
Answer
False
Fill in the blanks:
Question 1.
…………………. is a process of taking oxygen into the cells in order to break down simple food materials.
Answer
Respiration
Question 2.
…………………. is inhaling oxygen and exhaling carbon dioxide.
Answer
Breathing
Question 3.
The process of break down of food in the cell with the release of energy is called ………………….
Answer
cellular respiration
Question 4.
When the process of respiration takes place in the presence of oxygen is called ………………….
Answer
aerobic respiration
Question 5.
When the process of respiration takes place absence of oxygen, it is called ………………….
Answer
anaerobic respiration
Question 6.
…………………. are organism such as yeast that can survive in the absence of air.
Answer
Anaerobic
Question 7.
…………………. are respiratory organs of the fish.
Answer
Gills
Question 8.
Giving out of air rich in carbon dioxide is known as ………………….
Answer
exhalation
Question 9.
The taking in of air rich in oxygen into the body is called ………………….
Answer
inhalation
Question 10.
The number of types a person breathes in a minute is termed as the ………………….
Answer
breathing rate
Question 11.
…………………. is a part of respiration.
Answer
Breathing
Question 13.
Energy is stored in food and gets released during ………………….
Answer
respiration
Question 14.
…………………. is a vital biological process.
Answer
Respiration
Question 15.
Smoking damages ………………….
Answer
lungs
Question 16.
Cramp in legs are due to formation of …………………. acid.
Answer
lactic
Question 17.
…………………. of nose prevents the passage of smoke, dust inside the body.
Answer
Hairs
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