Breathing and Exchange of Gases


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

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

What is the befitting definition of dental formula?

Movement of food in Oesophagus occurs by following movement

Match the following columns.

Structure which prevents the tongue from falling into the throat

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

The common passage for food and air is

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

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

Diffusion membrane is made up of

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

Oesophagus opens into ….., J-shaped structure

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.

The oesophagus and trachea (wind pipe) open into

Correct sequence of the air passage in humans is

Respiratory or exchange part of the respiratory system comprises

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

Conducting part of the respiratory system comprises

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.

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

Respiration in insects is called direct because

Digestion is

Oxygen (O2) is utilized by an organism to

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

Small projections found on the upper surface of tongue are called

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.

Opening of oesophagus is known as ……..

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?

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

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

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

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

Which sphincter regulates the opening of oesophagus into stomach?

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

What is another name of gastro-oesophageal sphincter?

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.

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

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.

Which is the element that hardens the tooth enamel

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.

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

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

Which of the following statement is false?

Larynx is present in between

Frenulum is

Which of the following statement is incorrect about nasopharynx?

The incisor teeth are meant for

Friction on the lungs surface is reduced by?

Your score is



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

Which is not a true for Respiration ?

ATP is-

Which of the following step is reversible in 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

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

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

The end products of respiration in plants are-

Which of the following can converge on glycolysis to produce

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

Raw material for respiration is-

In glycolysis ultimately-

Select the wrong statement with respect to glycolysis

The “energy currency” of plants and animals is-

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

Which of the following is an energy yielding process?

Respiration occurs-

Which is true regarding Glycolysis

The enzyme which converts sucrose to glucose and

The common phase between aerobic and anaerobic
respiration is called-

Which of the following is not respiratory substrate -

The other name of glycolysis is-

Location of Glycolysis is :

The enzyme required to convert Fructose into Fructose-6-

Instantaneous source of energy is/are-

First phosphorylation of glucose during glycolysis is
catalyzed by

The Enzyme which convert PEP to Pyruvate

Respiratory pathway is-

The energy released during respiration is-

ATP contains-

Which of the following is correct-

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

Which of the following is correct preference of
respiratory substrate–

Your score is


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