Breathing and Exchange of Gases


These MCQs are intended for checking your Biology Chapter BREATHING AND EXCHANGE OF GASES,  knowledge.

Epiglottis is a cartilaginous flap which prevents the entry of food into

Which of the following statement is incorrect about nasopharynx?

Identify the component of respiratory system which displays the features given below and choose the correct option.
(A) Double layered.
(B) Fluid contained in it reduces the friction on the lung surface.
(C) Its outer layer is in contact with thoracic wall.
(D) Its inner layer is in contact with lungs.

Friction on the lungs surface is reduced by?

Small projections found on the upper surface of tongue are called

Which of the following components of our food are taken in small quantities?

Identify A, B and C in the given diagram and choose the correct Option accordingly.

When teeth are different in shape, size and function then these are called

During swallowing, glottis can be covered by a thin elastic cartilaginous flap called …A…to prevent the entry of
food into larynx. Trachea is it straight tube extending up to ...B...cavity. which then divides into right and left
primary …C…
Choose the correct option for .A, B and C from the given four options to complete the above statement.

Match the following columns.

Nasopharynx opens through the …A… of the larynx region into the …B... Choose the correct option for A and B to
complete the given statement.

Larynx is present in between

Which of the following statement is false?

The thoracic chamber is formed dorsally by the ...A..., ventrally by the ...B… laterally by the …C... and on lower
side by the dome-shaped ...D... Select the right choices for A, B, C and D to complete the given statement.

Which portion of the human respiratory system is called sound box?

Which of the following molecules can be used by us as a source of energy?

Digestion is

Opening of oesophagus is known as ……..

Which is the element that hardens the tooth enamel

What is the befitting definition of dental formula?

The oesophagus and trachea (wind pipe) open into

Oxygen (O2) is utilized by an organism to

At which thoracic vertebra does trachea divide into right and left primary bronchi?

During intake of food, what prevents the entry of food into the glottis (opening of windpipe)?

How many layers are present in the diffusion membrane of alveolus capillary?

Respiratory or exchange part of the respiratory system comprises

Respiration in insects is called direct because

Correct sequence of the air passage in humans is

Frenulum is

The figure shows a diagrammatic view of human respiratory system with labels A, B. C and D. Select the option,
which gives correct identification and main function and/or characteristic.

A person suffers punctures in his chest cavity in an accident, without any damage to the lungs its effect could be

Oesophagus opens into ….., J-shaped structure

Which sphincter regulates the opening of oesophagus into stomach?

What is another name of gastro-oesophageal sphincter?

Structure which prevents the tongue from falling into the throat

Opening of oesophagus into ‘J’- shaped, bag like structure is regulated by

The incisor teeth are meant for

A dental disease characterized by mottling of teeth is due to the presence of a certain chemical element in drinking
water. Which of the following is that element?

Movement of food in Oesophagus occurs by following movement

The common passage for food and air is

Identify which respiratory structure possesses the following features and choose the correct option accordingly.
(A) Found in mammals
(B) Highly muscular and fibrous partition, elevated towards the thorax like a dome
(C) Separates thoracic and abdominal cavity.

A thin long tube extending posteriorly and passing through neck, thorax and a diaphragm and leading to stomach is

The given schematic diagram depicts heterodont teeth and its thecodont arrangement. Find the correct labelling for
A-D from the options given below.

Which one serves as a passage for both food and air?

Conducting part of the respiratory system comprises

Regarding the function of our respiratory system, mark the wrong entry?

Read the following statements regarding the digestive system and select the correct statement.

Diffusion membrane is made up of

Your score is



These MCQs are intended for checking your Biology, Chapter BREATHING AND EXCHANGE OF GASES knowledge.

First phosphorylation of glucose during glycolysis is
catalyzed by

Which of the following can converge on glycolysis to produce

Which of the following step is reversible in glycolysis

Respiration occurs-

Enzymes taking part in glycolysis (EMP pathway) are present in-

The end products of respiration in plants are-

The energy released during respiration is-

The other name of glycolysis is-

Raw material for respiration is-

Which of the following is correct preference of
respiratory substrate–

In glycolysis ultimately-

Select the wrong statement with respect to glycolysis

Which of the following is an energy yielding process?

The Enzyme which convert PEP to Pyruvate

Respiratory pathway is-

Which of the following is Respiratory substrate : (a) Ascorbic acid (b) Fructose
(c) Protein (d) Calcium

The common phase between aerobic and anaerobic
respiration is called-

The enzyme required to convert Fructose into Fructose-6-

Which of the following is not respiratory substrate -

Location of Glycolysis is :

In glycolysis, NADH + H
+ is formed from NAD, when

Consider the following-
(a) In glycolysis two oxidative decarboxylation occur
(b) partial oxidation of sugar occur in glycolysis
how many are correct

The enzyme which converts sucrose to glucose and

ATP contains-

ATP is-

The “energy currency” of plants and animals is-

Which is true regarding Glycolysis

I. causes partial oxidation of glucose (one molecule)
to form 2-molecules of pyruvic acid and 2 ATP as net gain.
II. takes place in all living cells.
III. uses 2 ATP at two steps.
IV. scheme was given by Gustav Embden, Otto
Mayerhof and J Parnas.
Choose the correct option containing appropriate
statements from the above

Which of the following is correct-

The enzyme which converts glucose to glucose-6-
phosphate is-

Instantaneous source of energy is/are-

Which is not a true for Respiration ?

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