Class 7 Science MCQ Respiration in Organisms

Question : We feel hungry after a physical activity because we need:

(a) oxygen
(b) energy
(c) food
(d) none of these

Question : Yeasts are used in

(a) wine and beer industry
(b) bakery
(c) in both
(d) none of these

Question : During exhalation the size of the chest cavity __

(a) Decreases
(b) Increases
(c) Remains the same
(d) Get out of the lungs

Question : 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

Question : The percentage of oxygen in inhaled air is:

(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 21%

Question : A person can hold air in the lungs is:

(a) 50 ml
(b) 5000 ml
(c) 500 ml
(d) 0.5 ml

Question : The percentage of oxygen in exhaled air is:

(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 0.04%

Question : The percentage of oxygen in inhaled air is:

(a) 14.4%
(b) 4.4%
(c) 16.4%
(d) 21%

Question : The percentage of CO₂ in inhaled air is:

(a) 0.04%
(b) 21%
(c) 16.4%
(d) 4.4%

Question : A film of moisture of appears on the surface of the mirror when we:

(a) inhale
(b) exhale
(c) breathe
(d) none of these

Question : The vital biological process of organisms is:

(a) inspiration
(b) respiration
(c) transpiration
(d) evaporation

Question : 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<

Question : The muscles of legs can be relieved by:

(a) massaging
(b) running
(c) exercising
(d) sleeping

Question : In Cockroaches air enters the body through:

(a) lungs
(b) gills
(c) spiracles
(d) skin

Question : 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

Question : The respiratory organs of human beings are:

(a) lungs and skin
(b) lungs
(c) gills
(d) skin

Question : The process of respiration leads to the release of energy in:

(a) plants
(b) animals
(c) human beings
(d) all of these

Question : The absorb oxygen dissolved in water:

(a) frog
(b) fish
(c) earthworm
(d) butterfly

Question : The respiratory organ of birds are:

(a) mouth
(b) gills
(c) wet skin
(d) lungs

Question : Air exhaled:

(a) has no moisture
(b) has more amount of oxygen
(c) has moisture
(d) has less amount of carbon dioxide

Question : 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

Question : The process of intake of oxygen and exhalation of carbon dioxide is:

(a) breathing rate
(b) breathing
(c) respiration
(d) none of these

Question : Ribs move down and inward to decrease space in chess cavity during:

(a) inhalation
(b) exhalation
(c) respiration
(d) transportation

Question : In Cockroaches air enters the body through:

(a) lungs
(b) gills
(c) spiracles
(d) skin

Question : During heavy exercise, we get cramps in legs due to accumulation of:

(a) carbon dioxide
(b) lactic acid
(c) alcohol
(d) water

Question : 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

Question : During exhalation the ribs:

(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all

Question : During inhalation the ribs:

(a) move outwards
(b) move downwards
(c) move upwards
(d) do not move at all

Question : In fish air enters the body through:

(a) lungs
(b) gills
(c) spiracles
(d) skin

Question : Earthworm respires through

(a) lungs
(b) gills
(c) spiracles
(d) skin

Question : The energy giving process is

(a) respiration
(b) transpiration
(c) evaporation
(d) none of these

Question : Which disease is linked to smoking ?

(a) malaria
(b) cholera
(c) typhoid
(d) lung cancer

Question : The air tubes present in insects are:

(a) spiracles
(b) trachea
(c) gills
(d) none of these

Question : The reason of cramps in legs is:

(a) acetic acid
(b) hydrochloric acid
(c) lactic acid
(d) trachea

Question : In mammals the respiratory organ is:

(a) gills
(b) spiracles
(c) trachea
(d) lungs

Question : Which one of the following is an anaerobic organism ?

(a) yeast
(b) crow
(c) ant
(d) dog

Question : The percentage of carbon dioxide in exhaled air is:

(a) 0.4%
(b) 4.4%
(c) 14.4%
(d) 44%

Question : The size of chest cavity increases during:

(a) respiration
(b) inhalation
(c) transpiration
(d) none of these

Question : Frogs breathe through their skin as well as:

(a) gill
(b) lungs
(c) chest
(d) none of these

Question : The end products of anaerobic respiration are:

(a) ethyl alcohol
(b) carbon dioxide
(c) both (a) and (b)
(d) none of these

Question : The end products of an aerobic respiration are:

(a) carbon dioxide
(b) water and energy
(c) both (a) and (b)
(d) none of these

Question : These organisms survive in absence of air are known as:

(a) aerobic
(b) an aerobic
(c) earthworm
(d) none of these

Question : Respiration taking place in cells is:

(a) breathing
(b) cellular respiration
(c) transpiration
(d) evaporation

Question : When the process of respiration takes place absence of oxygen, it is called ………………….

Question : Smoking damages ………………….

Question : Cramp in legs are due to formation of …………………. acid.

Question : …………………. of nose prevents the passage of smoke, dust inside the body.

Question : …………………. are organism such as yeast that can survive in the absence of air.

Question : …………………. are respiratory organs of the fish.

Question : Giving out of air rich in carbon dioxide is known as ………………….

Question : The taking in of air rich in oxygen into the body is called ………………….

Question : The number of types a person breathes in a minute is termed as the ………………….

Question : …………………. is a part of respiration.

Question : …………………. is a process of taking oxygen into the cells in order to break down simple food materials.

Question : …………………. is inhaling oxygen and exhaling carbon dioxide.

Question : The process of break down of food in the cell with the release of energy is called ………………….

Question : When the process of respiration takes place in the presence of oxygen is called ………………….

Question : Energy is stored in food and gets released during ………………….

Question : …………………. is a vital biological process.