MCQ
Assertion (A): Inspiration can occur if the pressure within the lungs (intrapulmonary pressure) is less than the atmospheric pressure.
Reason (R): Expiration takes place when the intrapulmonary pressure is higher than the atmospheric pressure
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer

(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Both A and R are true but R is not the correct explanation of A.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion (A): Food vacuoles of Paramecium are noncontractile vacuoles.
Reason (R): They are meant for extracellular digestion.
Assertion (A): Vital capacity is higher in athletes than non - athletes.
Reason (R): Vital capacity is about 3.5-4.5 litres in a normal adult person.
Assertion (A): Cyanide causes toxicity in man.
Reason (R): Cyanide impairs the functioning of our nervous system.
Assertion (A): When $P_{c o_2}$ is high and $P_{o_2}$, is low as in the tissues, more binding of carbon dioxide occurs whereas, when the $P_{c o_2}$  is low and $P_{c o_2}$, is high as in the alveoli, dissociation of $CO _2$ from carbamino- hemoglobin takes place.
Reason (R):  $P_{c o_2}$, is a major factor that could affect the binding of $CO _2$ with hemoglobin.
Assertion (A): Tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings.
Reason (R): These rings of cartilage make the wall non-collapsible.
Assertion (A): Proenzyme is the precursor of an enzyme.
Reason (R): Proenzyme is as active as the enzyme.
Assertion (A): Oxygenation of blood promotes the release of carbon dioxide from the blood in the lungs.
Reason (R): Carbon dioxide is carried as bicarbonates in erythrocytes of blood.
Assertion (A): Potassium is only essential for animals.
Reason (R): Along with sodium is essential for the conduction of impulses in nerve cells.
Assertion (A): In condensation, a molecule of water is eliminated.
Reason (R): Condensation is an energy-releasing process.
Assertion (A): Special vascularised structures called gills are used by most of the aquatic arthropods and molluscs.
Reason (R): Vascularised bags called lungs are used by the terrestrial forms for the exchange of gases.