Here we are providing Class 7 Science Objective Chapter – 10 Respiration in Organisms because its very important for Class 6 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 7 Science Objective Chapter – 10 Respiration in Organisms is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 7 Science Objective Chapter – 10 Respiration in Organisms 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 7 Science Objective Chapter – 10 Respiration in Organisms
1.All organisms are made of small microscopic units which cannot be seen with the naked eyes, called
( A ) animals
( B ) cells
( C ) tissues
( D ) organs
Ans – ( B )
2.Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?
( A ) alcohol and lactic acid
( B ) alcohol and CO2
( C ) lactic acid and CO2
( D ) lactic acid only
Ans – ( D )
3.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 )
4.Organisms get energy through
( A ) food
( B ) eating
( C ) sleeping
( D ) none of these
Ans – ( A )
5.Yeast is used in wine and beer industries because it respires.
( A ) aerobically producing oxygen
( B ) aerobically producing alcohol
( C ) anaerobically producing alcohol
( D ) anaerobically producing CO2
Ans – ( C )
6.The vital biological process of organisms is:
( A ) inspiration
( B ) respiration
( C ) transpiration
( D ) evaporation
Ans – ( B )
7.Cellular respiration is carried out in the
( A ) cells
( B ) organs
( C ) tissues
( D ) muscles
Ans – ( A )
8.During the process of exhalation, the ribs move
( A ) down and inwards
( B ) up and inwards
( C ) down and outwards
( D ) up and outward
Ans – ( A )
9.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 )
10.Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?
( A ) alcohol and lactic acid
( B ) alcohol and CO2
( C ) lactic acid and CO2
( D ) lactic acid only
Ans – ( D )
11.Yeast is used in wine and beer industries because it respires.
( A ) aerobically producing oxygen
( B ) aerobically producing alcohol
( C ) anaerobically producing alcohol
( D ) anaerobically producing CO2
Ans – ( C )
12.During the process of exhalation, the ribs move
( A ) down and inwards
( B ) up and inwards
( C ) down and outwards
( D ) up and outward
Ans – ( A )
13.Breathing is a process that
(i) provides O2 to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO2
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?
( A ) (i) and (ii)
( B ) (ii) and (iii)
( C ) (i) and (iii)
( D ) (ii) and (iv)
Ans – ( C )
14.The process of breakdown of food in the cell is known as
( A ) breakdown process
( B ) cellular respiration
( C ) food breakdown
( D ) none of these
Ans – ( B )
15.We feel hungry after a physical activity because we need:
( A ) oxygen
( B ) energy
( C ) food
( D ) none of these
Ans – ( B )
16.Which are the gases involved in breathing?
( A ) O2 and NO2
( B ) O2 and SO2
( C ) O2 and O3
( D ) O2 and CO2
Ans – ( D )
17.An example of aerobes is
( A ) cat
( B ) dog
( C ) human being
( D ) all of these
Ans – ( D )
18.A person can hold air in the lungs is:
( A ) 50 ml
( B ) 5000 ml
( C ) 500 ml
( D ) 0.5 ml
Ans – ( C )
19.Name the organ of the body in which the blood is oxygenated.
( A ) Heart
( B ) Lungs
( C ) Lever
( D ) Pancreas
Ans – ( B )
20.When breakdown of glucose occurs with the use of oxygen, it is called
( A ) anaerobic respiration
( B ) aerobic respiration
( C ) regular respiration
( D ) all of these
Ans – ( B )
21.After heavy exercise, due to the accumulation of which substance we get muscle cramps ?
( A ) Malaic acid
( B ) Fumaric acid
( C ) Lipoic acid
( D ) Lactic acid
Ans – ( D )
22.The percentage of oxygen in exhaled air is:
( A ) 14.4%
( B ) 4.4%
( C ) 16.4%
( D ) 0.04%
Ans – ( C )
23.Name the type of respiration which causes muscle cramps.
( A ) Aerobic respiration
( B ) Anaerobic respiration
( C ) Both ( A ) and (b)
( D ) None of these
Ans – ( B )
24.Yeasts are used in
( A ) wine and beer industry
( B ) bakery
( C ) in both
( D ) none of these
Ans – ( A )
25.Breathing rate in human beings in normal condition is
( A ) 12-15 times in a minute
( B ) 15-18 times in a minute
( C ) 18-22 times in a minute
( D ) 22-25 times in a minute
Ans – ( B )
26.The percentage of oxygen in inhaled air is:
( A ) 14.4%
( B ) 4.4%
( C ) 16.4%
( D ) 21%
Ans – ( D )
27.Name the term which means ‘taking in of air rich in oxygen into the body’.
( A ) Exhalation
( B ) Inhalation
( C ) Breathing
( D ) Respiration
Ans – ( B )
28. Lime water turns milky due to the presence of which of the following gases?
( A ) Carbon monoxide
( B ) Carbon dioxide
( C ) Nitrogen
( D ) Oxygen
Ans – ( B )
29.The percentage of CO2 in inhaled air is:
( A ) 0.04%
( B ) 21%
( C ) 16.4%
( D ) 4.4%
Ans – ( A )
30.Which gas is given out during exhalation?
( A ) Oxygen
( B ) Nitrogen
( C ) Carbon dioxide
( D ) All of these
Ans – ( C )
31. Chest cavity is surrounded by
( A ) 12 pair of ribs
( B ) 10 pair of ribs
( C ) 11 pair of ribs
( D ) 25 ribs
Ans – ( A )
32.The respiratory organs of human beings are:
( A ) lungs and skin
( B ) lungs
( C ) gills
( D ) skin
Ans – ( B )
33.The gills help the fish to
( A ) take in oxygen from air
( B ) take in oxygen dissolved in water
( C ) absorb nutrients present in water
( D ) release waste substance in water
Ans – ( B )
34.The process of respiration leads to the release of energy in:
( A ) plants
( B ) animals
( C ) human beings
( D ) all of these
Ans – ( A )
35.Yeast are used to make
( A ) curd
( B ) wine and beer
( C ) bakery items
( D ) both ( B ) and (c)
Ans – ( D )
36.The absorb oxygen dissolved in water:
( A ) frog
( B ) fish
( C ) earthworm
( D ) butterfly
Ans – ( B )
37.Earthworms breathe through
( A ) skin
( B ) legs
( C ) trachea
( D ) nose
Ans – ( A )
38.The respiratory organ of birds are:
( A ) mouth
( B ) gills
( C ) wet skin
( D ) lungs
Ans – ( D )
39.The organ through which fishes breathe is
( A ) nose
( B ) gills
( C ) skin
( D ) spiracles
Ans – ( B )
40.Air exhaled:
( A ) has no moisture
( B ) has more amount of oxygen
( C ) has moisture
( D ) has less amount of carbon dioxide
Ans – ( C )
41.In the cells, oxygen is used to break down glucose into
( A ) carbon dioxide, water and energy
( B ) fats
( C ) alcohol, carbon dioxide and energy
( D ) lactic acid, water and energy
Ans – ( A )
42.After exercise:
( A ) respiration rate increases
( B ) respiration rate decreases
( C ) respiration rate remains same
( D ) none of these
Ans – ( A )
43.Cockroaches breathe by using an organ called
( A ) nose
( B ) tracheae
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
44.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 )
45.The most common substrate for respiration is
( A ) fats
( B ) amino acids
( C ) glucose
( D ) sucrose
Ans – ( C )
46.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 )
47.Organism which respires in the absences of oxygen is called a/an
( A ) microbe
( B ) anaerobe
( C ) aerobic
( D ) none of these
Ans – ( B )
48.If a potted plant is over watered, the roots will:
( A ) grow
( B ) die
( C ) dry
( D ) none of these
Ans – ( B )
49.During inspiration or inhalation, in lungs
( A ) volume decreases, pressure increases
( B ) volume increases, pressure decreases
( C ) volume decreases, pressure decreases
( D ) volume increases, pressure increases
Ans – ( B )
50.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 )
51.Insects have a special network of tubes called
( A ) tracheae
( B ) gills
( C ) spiracles
( D ) lungs
Ans – ( A )
52.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 )
53.The major source of oxygen for the aquatic animals is
( A ) atmosphere
( B ) water
( C ) soil
( D ) none of these
Ans – ( C )
54.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 )
55.Primary organ of human respiratory system is
( A ) lung
( B ) liver
( C ) heart
( D ) pharynx
Ans – ( A )
56.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 )
57.When breakdown of glucose occurs in the presence of oxygen, the respiration is called
( A ) anaerobic
( B ) microbe
( C ) aerobic
( D ) none of these
Ans – ( C )
58.Ribs move down and inward to decrease space in chess cavity during:
( A ) inhalation
( B ) exhalation
( C ) respiration
( D ) transportation
Ans – ( B )
59.The tracheal tubes have openings called
( A ) trachea
( B ) gills
( C ) lungs
( D ) spiracles
Ans – ( D )
60.In Cockroaches air enters the body through:
( A ) lungs
( B ) gills
( C ) spiracles
( D ) skin
Ans – ( C )
61.The process of breakdown of food in the cell with the release of energy is called
( A ) cellular respiration
( B ) aerobic respiration
( C ) anaerobic respiration
( D ) none of these
Ans – ( A )
62.During heavy exercise, we get cramps in legs due to accumulation of:
( A ) carbon dioxide
( B ) lactic acid
( C ) alcohol
( D ) water
Ans – ( B )
63.In earthworm, the exchange of gases occurs through
( A ) lungs
( B ) moist skin
( C ) gills
( D ) trachea
Ans – ( B )
64.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 )
65.Plants breathe through tiny pores in the leaves called
( A ) stomata
( B ) leaf blade
( C ) pores
( D ) trachea
Ans – ( A )
66.During inhalation the ribs:
( A ) move outwards
( B ) move downwards
( C ) move upwards
( D ) do not move at all
Ans – ( C )
67.Which of the following animals breathe through skin as well as through lungs?
( A ) Fish
( B ) Earthworm
( C ) Cockroach
( D ) Frog
Ans – ( D )
