09. ASSERTION and REASON(NCERT)
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BREATHING and EXCHANGE OF GASES

278167 Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT ( Page-270
BREATHING and EXCHANGE OF GASES

278168 Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the pons region of the brain.
Reason: Pneumotaxic centre controls the switch ' $\text{ON}$ ' point of inspiration.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-275 / N-190
BREATHING and EXCHANGE OF GASES

278169 Assertion : Inspiration occurs due to muscular contraction.
Reason: During inspiration, the diaphragm and external intercostal muscle relax simultaneously.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-271 / N-186
BREATHING and EXCHANGE OF GASES

278170 Assertion : $\text{C}{{\text{O}}_{2}}$ diffuses only from tissue to alveoli and not in reverse direction.
Reason : $\text{C}{{\text{O}}_{2}}$ is 10 times more soluble than ${{\text{O}}_{2}}$.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-273 & 274/ N-188
BREATHING and EXCHANGE OF GASES

278171 Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NEET DIGITAL LIBRARY
BREATHING and EXCHANGE OF GASES

278167 Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT ( Page-270
BREATHING and EXCHANGE OF GASES

278168 Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the pons region of the brain.
Reason: Pneumotaxic centre controls the switch ' $\text{ON}$ ' point of inspiration.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-275 / N-190
BREATHING and EXCHANGE OF GASES

278169 Assertion : Inspiration occurs due to muscular contraction.
Reason: During inspiration, the diaphragm and external intercostal muscle relax simultaneously.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-271 / N-186
BREATHING and EXCHANGE OF GASES

278170 Assertion : $\text{C}{{\text{O}}_{2}}$ diffuses only from tissue to alveoli and not in reverse direction.
Reason : $\text{C}{{\text{O}}_{2}}$ is 10 times more soluble than ${{\text{O}}_{2}}$.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-273 & 274/ N-188
BREATHING and EXCHANGE OF GASES

278171 Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
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BREATHING and EXCHANGE OF GASES

278167 Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT ( Page-270
BREATHING and EXCHANGE OF GASES

278168 Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the pons region of the brain.
Reason: Pneumotaxic centre controls the switch ' $\text{ON}$ ' point of inspiration.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-275 / N-190
BREATHING and EXCHANGE OF GASES

278169 Assertion : Inspiration occurs due to muscular contraction.
Reason: During inspiration, the diaphragm and external intercostal muscle relax simultaneously.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-271 / N-186
BREATHING and EXCHANGE OF GASES

278170 Assertion : $\text{C}{{\text{O}}_{2}}$ diffuses only from tissue to alveoli and not in reverse direction.
Reason : $\text{C}{{\text{O}}_{2}}$ is 10 times more soluble than ${{\text{O}}_{2}}$.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-273 & 274/ N-188
BREATHING and EXCHANGE OF GASES

278171 Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
For More Updates join with Us
BREATHING and EXCHANGE OF GASES

278167 Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT ( Page-270
BREATHING and EXCHANGE OF GASES

278168 Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the pons region of the brain.
Reason: Pneumotaxic centre controls the switch ' $\text{ON}$ ' point of inspiration.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-275 / N-190
BREATHING and EXCHANGE OF GASES

278169 Assertion : Inspiration occurs due to muscular contraction.
Reason: During inspiration, the diaphragm and external intercostal muscle relax simultaneously.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-271 / N-186
BREATHING and EXCHANGE OF GASES

278170 Assertion : $\text{C}{{\text{O}}_{2}}$ diffuses only from tissue to alveoli and not in reverse direction.
Reason : $\text{C}{{\text{O}}_{2}}$ is 10 times more soluble than ${{\text{O}}_{2}}$.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-273 & 274/ N-188
BREATHING and EXCHANGE OF GASES

278171 Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NEET DIGITAL LIBRARY
BREATHING and EXCHANGE OF GASES

278167 Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT ( Page-270
BREATHING and EXCHANGE OF GASES

278168 Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the pons region of the brain.
Reason: Pneumotaxic centre controls the switch ' $\text{ON}$ ' point of inspiration.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-275 / N-190
BREATHING and EXCHANGE OF GASES

278169 Assertion : Inspiration occurs due to muscular contraction.
Reason: During inspiration, the diaphragm and external intercostal muscle relax simultaneously.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-271 / N-186
BREATHING and EXCHANGE OF GASES

278170 Assertion : $\text{C}{{\text{O}}_{2}}$ diffuses only from tissue to alveoli and not in reverse direction.
Reason : $\text{C}{{\text{O}}_{2}}$ is 10 times more soluble than ${{\text{O}}_{2}}$.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)
NCERT Page-273 & 274/ N-188
BREATHING and EXCHANGE OF GASES

278171 Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

1 Both (A) and (R) are correct but (R) is not the correct explanation of(A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both(A)and (R) are correct and (R) is the correct . explanation of (A)