A&R BREATHING AND EXCHANGE, NEHA VERMA

Assertion - Mechanism of breathing vary among different groups of animals.

Reason - It depends mainly on their habitats and levels of organization.

• Assertion & Reason both true, Reason is the correct explanation of Assertion

• Assertion & Reason both true, but Reason is not correct explanation of Assertion

• Assertion is true, but Reason is false

• both Assertion and Reason false

Assertion - Nasal Chamber opens into Nasopharynx which is a portion of Pharynx.

Reason - Nasopharynx opens through Epiglottis of the Larynx region into the wind pipe.

• A&R both true, R is the correct explanation of A

• A&R both true, but R is not correct explanation of A

• A is true, but R is false

• both A and R false

Assertion - Till initial bronchioles only C-shaped Cartilaginous rings are present.

Reason - Conducting Zone also, last till initial bronchioles only.

• A&R both true, R is the correct explanation of A

• A&R both true, but R is not correct explanation of A

• A is true, but R is false

• both A and R false

Assertion - any change in the volume of Thoracic Cavity will be reflected in the Pulmonary Cavity.

Reason - this is because of anatomical setup of lungs in the thorax.

• A&R both true, R is the correct explanation of A

• A&R both true, but R is not correct explanation of A

• A is true, but R is false

• both A and R false

Assertion - we have the ability to increase the strength of inspiration and expiration.

Reason - this can be done by the help of additional muscles we have in our Abdomen.

• A&R both true, R is the correct explanation of A

• A&R both true, but R is not correct explanation of A

• A is true, but R is false

• both A and R false

Assertion - total volume of air accommodated in our lungs at the end of forced inspiration is Vital Capacity.

Reason - It includes TLC-RV.

• A&R both true, R is the correct explanation of A

• A&R both true, but R is not correct explanation of A

• A is true, but R is false

• both A and R false

Assertion - exchange of gases mainly occur by simple diffusion based on pressure and concentration gradient.

Reason - role of O2 is negligible in these gradients.

• both A&R are true, R is correct explanation of A

• Both A&R are correct, but R is not correct explanation of A

• Only A is correct

• Both A&R are false

Assertion - partial pressure of O2 in air in more as compared to its partial pressure in alveoli.

Reason - This difference accounts for around 55mm of Hg

• Both A&R are correct, R is the correct explanation of A

• Both A&R are correct, R is not the correct explanation of A

• A is true but R is false

• Both A&R are false

Assertion - Carbonic Anhydrase enzyme is present in large quantities in RBCs only

Reason - Every 100ml of deoxygenated blood contains about 4ml of CO2 and no O2 during gaseous transport.

• Both A&R are true, R is the correct explanation of A

• Both A&R are true, R is not the correct explanation of A

• A is true but R is false

• Both A and R are false

Assertion - pneumotaxic centre can moderate the functions of respiratory rhythm centre

Reason - neural signal from this centre can increase the duration of inspiration and thereby alter respiratory rate.

• Both A and R are correct, R is the correct explanation of A

• Both A and R are correct, R is the not the correct explanation of A

• A is true but R is false

• Both A and R are false