CBSE 11th Standard Biology Subject Breathing and Exchange of Gases HOT Questions 1 Marks Questions With Solution 2021
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CBSE 11th Standard Biology Subject Breathing and Exchange of Gases HOT Questions 1 Marks Questions With Solution 2021
11th Standard CBSE
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Reg.No. :
Biology
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Why is respiration in insect called direct?
(a)The insects have network of tubes (tracheal system). The cells of the tracheal system exchange O2/CO2 directly with the air by the spiracles present insect's body.
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How is negative pressure breathing helpful for mammals?
(a)It allows the mammals to eat and breathe at the same time.
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Why is it advisable to do nasal breathing rather than mouth breathing?
(a)Nasal breathing is advisable because it is healthier as the air inhaled gets filtered through the hairs present inside the nose, so cleaner air reaches to the lungs.
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What is the role of oxyhaemoglobin after the release of molecular oxygen in the tissue?
(a)Combines with carbon dioxide to form carbamino-haemoglobin.
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Differentiate between haemoglobin of human and earthworm?
(a)Human: RBC; Earthworm : dissolved in plasma( location based).
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Why cartilaginous rings on trachea are C-shaped?
(a)For shock absorption and expansion / contraction while breathing in / out.
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Define partial pressure of gases?
(a)Pressure exerted by the molecules of a gas in a mixture of gases.
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If deoxygenated blood in the lungs has PCO2= 46 mmHg, what should be the alveolar PCO2,for CO2 to diffuse into alveoli from blood.
(a)Less than 46mmHg.
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A blood vessel in kidney has PO2 =90mmHg, while that in the tissue is 76mmHg. What will be the direction of diffusion of O2
(a)O2 will diffuse from blood into the tissues of kidney.
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What is chloride shift? What is its importance?
(a)Diffusion of Cl- from blood plasma into RBC. To maintain ionic balance & electrochemical neutrality.
1 Marks
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CBSE 11th Standard Biology Subject Breathing and Exchange of Gases HOT Questions 1 Marks Questions With Solution 2021 Answer Keys
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The insects have network of tubes (tracheal system). The cells of the tracheal system exchange O2 /CO2 directly with the air by the spiracles present in insect's body.
The insects have network of tubes (tracheal system). The cells of the tracheal system exchange O2 /CO2 directly with the air by the spiracles present in insect's body.
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Mammals use negative pressure to suck air in. The diaphragm contracts and move down, the intercostal muscles contract and move up and out. This causes the lungs to expand. The pressure inside the lungs drops.
Mammals use negative pressure to suck air in. The diaphragm contracts and move down, the intercostal muscles contract and move up and out. This causes the lungs to expand. The pressure inside the lungs drops.
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Nasal breathing is advisable because it is healthier as the air inhaled gets filtered through the hairs present inside the nose, so cleaner air reaches to the lungs.
Nasal breathing is advisable because it is healthier as the air inhaled gets filtered through the hairs present inside the nose, so cleaner air reaches to the lungs.
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Combines with carbon dioxide to form carbamino-haemoglobin.
Combines with carbon dioxide to form carbamino-haemoglobin.
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Human: RBC; Earthworm : dissolved in plasma( location based).
Human: RBC; Earthworm : dissolved in plasma( location based).
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For shock absorption and expansion / contraction while breathing in / out.
For shock absorption and expansion / contraction while breathing in / out.
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Pressure exerted by the molecules of a gas in a mixture of gases.
Pressure exerted by the molecules of a gas in a mixture of gases.
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The partial pressure of CO2 (pCO2) in the alveoli should be less than the partial pressure of venous blood (deoxygenated blood) for diffusion of CO2 from blood into the alveoli for its removal. The partial pressure of CO in venous blood is 46 mm Hg and that of alveoli is only 40 mm Hg.
The partial pressure of CO2 (pCO2) in the alveoli should be less than the partial pressure of venous blood (deoxygenated blood) for diffusion of CO2 from blood into the alveoli for its removal. The partial pressure of CO in venous blood is 46 mm Hg and that of alveoli is only 40 mm Hg.
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O2 will diffuse from blood into the tissues of kidney.
O2 will diffuse from blood into the tissues of kidney.
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Diffusion of Cl- from blood plasma into RBC. To maintain ionic balance & electrochemical neutrality.
Diffusion of Cl- from blood plasma into RBC. To maintain ionic balance & electrochemical neutrality.
1 Marks
