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Breathing and Exchange of Gases Class 11 MCQs Questions with Answers
Question 1.
Which one of the following mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically?
(a) unstraited muscle cells
(b) liver cells
(c) red blood cells
(d) white blood
Answer
Answer: (c) red blood cells
Question 2.
The process of migration of chloride ions from plasma to RBC and of carbonate ions from RBC to plasma is:
(a) chloride shift
(b) ionic shift
(c) atomic shift
(d) Na+ pump
Answer
Answer: (a) chloride shift
Question 3.
When CO2 concentration in blood increases, breathing becomes:
(a) shallower and slow
(b) there is no effect on breathing
(c) slow and deep
(d) faster and deeper
Answer
Answer: (d) faster and deeper
Question 4.
Intercostal muscles occur in:
(a) abdomen
(b) thigh
(c) ribs
(d) diaphragm
Answer
Answer: (c) ribs
Question 5.
Very high number of alveoli present in a lung is meant for
(a) More space for increasing volume of inspired air
(b) More area for diffusion
(c) Making the organ spongy
(d) Increasing nerve supply
Answer
Answer: (b) More area for diffusion
Question 6.
Azygous lobe is part of
(a) Lung
(b) Kidney
(c) Larynx
(d) Palate
Answer
Answer: (a) Lung
Question 7.
The alveolar epithelium in the lungs is:
(a) nonciliated columnar
(b) nonciliated squamous
(c) ciliated columnar
(d) ciliated squamous
Answer
Answer: (b) nonciliated squamous
Question 8.
How much oxygen, blood supplies to tissues in one circulation
(a) 75%
(b) 1.34%
(c) 25%
(d) 7%
Answer
Answer: (c) 25%
Question 9.
How oxygen enters in blood from alveoli of lungs
(a) Pressure of CO2
(b) Simple diffusion
(c) By Hb
(d) None of the Above
Answer
Answer: (b) Simple diffusion
Question 10.
The carbon dioxide is transported via blood to lungs as:
(a) dissolved in blood plasma
(b) in the form of carbonic acid only
(c) in combination with haemoglobin only
(d) carbaminohaemoglobin and as carbonic acid
Answer
Answer: (d) carbaminohaemoglobin and as carbonic acid
Question 11.
Thoracic cavity is enlarged by contraction of
(a) Internal Intercostal muscles
(b) Diaphragm
(c) Lungs
(d) All of above
Answer
Answer: (b) Diaphragm
Question 12.
The two organisms which breath only through their moist skin are
(a) Frog and earthworm
(b) Fish and frog
(c) Leech and earthworm
(d) Fish and earthworm
Answer
Answer: (c) Leech and earthworm
Question 13.
Chloride shift for the transport of
(a) O2
(b) CO2
(c) CO
(d) Ozone
Answer
Answer: (b) CO2
Question 14.
Increased asthmatic attacks in certain seasons are related to
(a) Inhalation of seasonal pollen
(b) Hot and humid environment
(c) Low temperature
(d) Eating fruits preserved in containers
Answer
Answer: (a) Inhalation of seasonal pollen
Question 15.
The lungs are enclosed in a covering called
(a) Perichondrium
(b) Pleural membrane
(c) Pericardium
(d) Peritoneum
Answer
Answer: (b) Pleural membrane
Question 16.
The exchange of gases in the alveoli of the lungs takes place by:
(a) simple diffusion
(b) osmosis
(c) active transport
(d) passive transport
Answer
Answer: (a) simple diffusion
Question 17.
Oxygen dissociation curve of haemoglobin is:
(a) Sigmoid
(b) Hyperbolic
(c) Linear
(d) Hypobolic
Answer
Answer: (a) Sigmoid
Question 18.
A film of _____ lines lung alveoli that lowers _____ of the alveoli and makes breathing _____
(a) Lecithin, surface tension, easier.
(b) Pleuron, surface tension, easier.
(c) Cuticle, bacterial inflammation, difficult.
(d) Cuticle, inflating, difficult.
Answer
Answer: (a) Lecithin, surface tension, easier.
Question 19.
Opening to the trachea is covered by a small flap of tissues termed as the ______.
(a) Glottis
(b) Trachea
(c) Epiglottis
(d) Larynx
Answer
Answer: (c) Epiglottis
Question 20.
Which one of the following mammalian cells is not capable of metabolising glucose to carbon dioxide aerobically?
(a) Unstriated muscle cells
(b) White blood cells
(c) Liver cells
(d) Red blood cells
Answer
Answer: (d) Red blood cells
Question 21.
The regulatory centres for respiration are located in :
(a) Diencephalon and pons
(b) medulla oblongata & pons
(c) pons & cerebellum
(d) cerebellum and medulla oblongata
Answer
Answer: (b) medulla oblongata & pons
Question 22.
The pneumotaxic centre is present in
(a) Medulla
(b) Cerebrum
(c) Cerebellum
(d) Pons varolii
Answer
Answer: (d) Pons varolii
Question 23.
In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by
(a) alveolar epithelium only
(b) alveolar epithelium and capillary endothelium
(c) alveolar epithelium, capillary endothelium and tunica adventitia
(d) alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia
Answer
Answer: (b) alveolar epithelium and capillary endothelium
Question 24.
Habit of Cigarette smoking can lead to :
(a) loss of cilia lining the respiratory tract
(b) emphysema
(c) coughing
(d) All of the Above
Answer
Answer: (d) All of the Above
Question 25.
During inspiration muscles of diaphragm
(a) Contracts
(b) Expands
(c) No effect
(d) Coiled like string
Answer
Answer: (b) Expands
Question 26.
If TLC is 5500ml, IRV is 2950ml, ERV is 900ml and TV is 500ml then what will be value of RV?
(a) 2550ml
(b) 1100ml
(c) 1200ml
(d) 1150ml
Answer
Answer: (d) 1150ml
Question 27.
Respiration in insects is direct due to exchange of gases
(a) Directly with the air outside through body surface
(b) By tracheal tubes directly with haemocoel which then exchange with tissues.
(c) Directly with coelomic fluid
(d) Directly with the air in tubes
Answer
Answer: (b) By tracheal tubes directly with hemocoel which then exchange with tissues.
Question 28.
Book lungs are respiratory organs of
(a) Mammals
(b) Mollusca
(c) Earthworm
(d) Arachnida
Answer
Answer: (d) Arachnida
Question 29.
Expiration involves
(a) Relaxation of diaphragm and intercostal muscles
(b) Contraction of diaphragm and intercostal muscles
(c) Contraction of diaphragm muscles
(d) Contraction of intercostal muscles
Answer
Answer: (a) Relaxation of diaphragm and intercostal muscles
Question 30.
Cartilaginous rings in trachea are incomplete at which surface.
(a) Dorsal
(b) Ventral
(c) Lateral
(d) Ventrolateral
Answer
Answer: (a) Dorsal
Question 31.
What percentage of CO2 flows in blood in form of bicarbonates
(a) 7%
(b) 23%
(c) 50%
(d) 70%
Answer
Answer: (d) 70%
Question 32.
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude
(a) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
(b) there is more UV radiation which enhances RBC production
(c) people eat more nutritive food, therefore more RBCs are formed
(d) people get pollution-free air to breathe and more oxygen is available
Answer
Answer: (a) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
Question 33.
Wall of alveoli is composed of
(a) Simple squamous epithelium
(b) Simple cuboidal epithelium
(c) Pseudostratified epithelium
(d) Simple columnar epithelium
Answer
Answer: (a) Simple squamous epithelium
Question 34.
Air is breathed through:
(a) Trachea — lungs — larynx — pharynx — alveoli
(b) Nose — larynx — pharynx — bronchus — alveoli — bronchioles
(c) Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli
(d) Nose — mouth — lungs
Answer
Answer: (c) Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli
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