CBSE Class 7 Science Respiration in Organisms MCQs

Respiration in Organisms

Question. The process of breakdown of food in the cell with the release of energy is called ________ 
(a) Respiration 
(b) Inhalation
(c) Exhalation
(d) Breathing

Answer:  A

Question. Taking in air rich in oxygen into the body is called _________ 
(a) Respiration 
(b) Inhalation
(c) Exhalation
(d) Breathing

Answer:  C

Question. Giving out of air rich in carbon dioxide is called __________
(a) Respiration
(b) Inhalation
(c) Exhalation
(d) Breathing

Answer:  C

Question. An adult human being at rest breathes in and out for______ times in a minute 
(a) 15-18
(b) 20-25
(c) 10-15
(d) 50-60

Answer:  A

Question. During exhalation the size of the chest cavity ______ 
(a) Decreases
(b) Increases 
(c) Remains the same
(d) Get out of the lungs

Answer:  A

Question. To which disease is smoking linked ? 
(a) Appendicitis
(b) Cancer
(c) Fever
(d) Anaemia

Answer:  B

Question. Name the organism which breathes through its skin 
(a) Cat
(b) Human beings 
(c) Dog
(d) Earthworm

Answer:  D

Question. The small openings in the body of a cockroach are called ( ) 
(a) Holes
(b) Spiracles
(c) Tracks
(d) Pores

Answer:  B

Question. Name the organism that breathes through its lungs as well as its skin ( )
(a) Human being
(b) Frog
(c) Dog
(d) Earthworm 

Answer:  B

Question. The air tubes that an insect has are useful for the exchange of________( )
(a) Gases
(b) Liquids
(c) Solid s
(d) No exchange

Answer:  A

Question. In cockroaches, air enters the body through ____________( )
(a) Lungs
(b) Gills 
(c) Spiracles 
(d) Skin

Answer:  C

Question. During heavy exercise, we get cramps in the legs due to the accumulation of ( )
(a) Carbon dioxide
(b) Lactic acid
(c) Alcohol
(d) water

Answer:  B

Question. Which statement is correct?
(a) Exhaled air contains more oxygen and less carbon dioxide.
(b) Exhaled air contains less oxygen and less carbon dioxide.
(c) Inhaled air contains equal amount of carbon dioxide and oxygen.
(d) Exhaled air contains more carbon dioxide and less oxygen.

Answer:  D

Question. Which one of the following is an anaerobic organism ?
(a) yeast
(b) crow
(c) ant
(d) dog

Answer:  A

Question. Which Of The Following Is Most Likely To Have A Much Higher Breathing Rate?
(a) Man
(b) Dog
(c) Sparrow
(d) Fish

Answer:  D

Question. The most common substrate for respiration is
(a) fats
(b) amino acids
(c) glucose
(d) sucrose

Answer:  C

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

Answer:  C

Question. Cockroaches breathe by using an organ called
(a) nose
(b) tracheae
(c) both (a) and (b)
(d) none of these

Answer:  D

Question. Which of these are the organs of human respiratory system?
(a) Trachea
(b) Bronchus
(c) Alveolus
(d) All of these 

Answer:  D 

Question. 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

Answer:  B 

Question. 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 

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

Answer:  D 

Question. Earthworms breathe through
(a) skin
(b) legs
(c) trachea
(d) nose 

Answer:  A 

Question. Muscular floor of the chest cavity is called
(a) Rib cage
(b) Diaphragm
(c) Trachea
(d) Bronchus 

Answer:  B 

Question. The end products of anaerobic respiration are:
(a) ethyl alcohol
(b) carbon dioxide
(c) both (a) and (b)
(d) none of these

Answer:  C 

Question. 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 

Question. Which disease is linked to smoking ?
(a) malaria
(b) cholera
(c) typhoid
(d) lung cancer 

Answer:  D 

Question. More energy is released in
(a) Breathing
(b) Fermentation
(c) Anaerobic respiration
(d) Aerobic respiration 

Answer:  D 

Question. 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

Answer:  C 

Question. Name the organ of the body in which the blood is oxygenated.
(a) Heart
(b) Lungs
(c) Lever
(d) Pancreas 

Answer:  B 

Question. Name the term which means ‘taking in of air rich in oxygen into the body’.
(a) Exhalation
(b) Inhalation
(c) Breathing
(d) Respiration 

Answer:  B 

Question. Air tubes in insect is called
(a) Gills
(b) Air tube
(c) Air bladder
(d) Tracheae 

Answer:  D 

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

Answer:  C 

Question. Lime water turns milky due to the presence of which of the following gases?
(a) Carbon monoxide
(b) Carbon dioxide
(c) Nitrogen
(d) Oxygen

Answer:  B 

Question. The muscles of legs can be relieved by:
(a) massaging
(b) running
(c) exercising
(d) sleeping 

Answer:  A 

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

Answer:  C 

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

Answer:  B 

Question. 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 

Answer:  B 

Question. Chest cavity is surrounded by
(a) 12 pair of ribs
(b) 10 pair of ribs
(c) 11 pair of ribs
(d) 25 ribs 

Answer:  A