CBSE Class 7 Science Respiration in Organisms MCQs Set B

Question: During exhalation the ribcage moves –
a) upward and outward
b) downwards and inwards
c) from side to side
d) does not move at all
Answer: b

Question: Which one is anabolic process?
a) Respiration
b) Digestion
c) Photosynthesis
d) Ascent of sap
Answer: c

Question: An animal breathe through skin as well as lungs is –
a) frog
b) Earthworm
c) snail
d) fish
Answer: a

Question: Air tube of an insect is called –
a) Spiracle
b) larynx
c) pharynx
d) gills
Answer: a

Question: A catabolic process is –
a) Absorption of minerals
b) Ascent of sap
c) Respiration
d) Assimilation
Answer: c

Question: Respiration is the process in which –
a) energy is stored in the form of ADP
b) energy is released and stored in the form of ATP
c) energy is not released at all
d) energy is used up
Answer: b

Question: The form of energy used in respiration is –
a) Chemical energy
b) Electrical energy
c) Mechanical energy
d) Radiant energy
Answer: a

Question: Plants get their oxygen requirement for respiration through –
a) stomata
b) lenticels
c) both (A) and (B)
d) None of these
Answer: c

Question: What is wrong about respiration
a) It does not occur in cell
b) Oxidation occurs without the use of enzymes
c) Energy is released in one step quickly
d) All the above
Answer: d

Question: Glucose is oxidised to ethyl alcohol in –
a) aerobic respiration
b) anaerobic respiration
c) fermentation
d) none of these
Answer: b

Question: Exchange of gasses occurs through
a) Stomata
b) Lenticels
c) Root surface
d) All the above
Answer: d

Question: Which one of the following is the link between glycolysis and Kreb’s cycle?
a) Phosphoenolpyruvic acid
b) Fumaric acid
c) Citric acid
d) Acetyl Co-A
Answer: d

Question: Which one of the following can respire in the absence of oxygen? –
a) fish
b) frog
c) yeast
d) Man
Answer: c

Question: During inhalation the diaphragm moves –
a) upwards
b) downwards
c) towards left
d) towards right
Answer: b

Question: Normal range of breathing rate in an average adult person at rest is –
a) 9 to 12
b) 15 to 18
c) 12 to 20
d) 30 to 33
Answer: c

Question: The air sacs at the end of the smallest air tubes inside the lungs are called.
a) alveoli
b) bronchi
c) bronchioles
d) larynx
Answer: a

Question: Stomata open during day time because the guard cells:
a) are thin walled
b) are bean shaped
c) have to help in gaseous exchange
d) photosynthesize and produce osmotically active sugars or organic acids
Answer: d

Question: In anaerobic respiration in plants:
a) O₂ is taken in
b) O₂ is given out
c) CO₂ is taken in
d) CO₂ is given out
Answer: d

Question: Which of the following is the source of respiration –
a) Stored food
b) Fats
c) Glucose
d) Proteins
Answer: a

Question: Vocal cords occur in
a) pharynx
b) glottis
c) bronchii
d) larynx
Answer: d

Question: Which of the following prevents collapsing of trachea?
a) Diaphragm
b) Ribs
c) Cartilaginous discs
d) Muscles
Answer: c

Question: When diaphragm of man is completely dome shaped it shows
a) End of expiration and beginning of inspiration
b) Beginning of expiration and end of inspiration
c) Increased rate of breathing
d) Decreased rate of breathing
Answer: a

Question: Which one of the following binds with haemoglobin irreversibly?
a) Carbon dioxide
b) Carbon monoxide
c) Ethane
d) Nitrogen
Answer: b

Question: The exchange of gases in a mammal takes place in
a) Trachea
b) Bronchioles
c) Bronchii
d) Alveoli
Answer: d

Question: A person having high fever may be breathing faster than normal. The reason for this faster breathing is due to
a) Additional need of O₂ for germs
b) Mental worry of the patient
c) High temperature of body
d) Loss of appetite
Answer: c

Question: Asthma is a respiration disease caused due to
a) Infection of trachea
b) Infection of lungs
c) Bleeding into pleuro cavity
d) Spasm in bronchial muscles
Answer: d

Question: In man, which of the following structures is analogous to the spiracles of cockroach?
a) Alveoli
b) Lungs
c) Bronchioles
d) Nostrils
Answer: d

Question: Lungs have a large number of alveoli for
a) Having spongy texture and proper shape
b) More surface area for diffusion of gases
c) More space for increasing volume of inspired air
d) More nerve supply
Answer: b

Question: The covering of lungs is called
a) Pericardium
b) Pleural membrane
c) Perichondrium
d) Peritoneum
Answer: b

Question: Presence of large number of alveoli around alveolar ducts opening into bronchioles in mammalian lungs is
a) Inefficient system of ventilation with little of residual air
b) Inefficient system of ventilation with high percentage of residual air
c) An efficient system of ventilation with no residual air
d) An efficient system of ventilation with little residual air
Answer: d

Question: Which one of the following structures closes the respiratory passage during ingestion of food?
a) Larynx
b) Epiglottis
c) Hard palate
d) Soft palate
Answer: b

Question: The narrowest and most numerous tubes of lungs are termed as
a) Bronchus
b) Alveoli
c) Bronchioles
d) Hilum
Answer: c

Question: Which one of the following events takes place during inspiration in man?
a) The internal intercostal muscles relax
b) Due to contraction of external intercostal muscles and flattening of diaphragm the volume of thoracic cavity increases
c) Due to contraction of external intercoastal muscles and flattening of diaphragm the volume of thoracic cavity decreases
d) The abdominal muscles contract
Answer: b

Question: A normal man respires in a minute
a) 10–15 times
b) 14–18 times
c) 20–25 times
d) 25–30 times
Answer: b