Important Practice Questions and Answers in Biology Part 2

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3. What is true about haemoglobin?

(a) It is a dipeptide and present in red blood corpuscles in bloodworm.

(b) It is present in the dissolved state in blood plasma in earthworm.

(c) It is a dipeptiede in mammals and localized in red blood corpuscles.

(d) It is present in dissolved state in blood plasma in scorpions.

Answer: (c)

4. The vital capacity of the lung signifies the volume of air

(a) Breathed in during normal inspiration.

(b) Breathed out with forcible expiration.

(c) Breathed in with forcible inspiration.

(d) With deep inspiration and forcible expiration.

Answer: (d)

5. Division of mammalian lungs into a very large number of tiny alveoli around alveolar ducts opening into bronchioles, is

(a) An inefficient system of ventilation of alveoli though with very little residual air.

(b) An inefficient system of ventilating the alveoli resulting in very high percentage of residual air in the lungs.

(c) A very efficient system of ventilating the alveoli with no residual air.

(d) An efficient system of ventilation of alveoli with little or no residual air.

Answer: (d)

6. The site of gaseous exchange in lungs is

(a) Liver

(b) Alveoli

(c) Trachea

(d) None of these

Answer: (a)

7. If concentration in tissue was almost as high as at the respiratory surface

(a) Oxyhaemoglobin would dissociate to supply to the tissue

(b) Heamoglobin would combine with more at respiratory surface

(c) Oxyhaemoglobin would not dissociate to supply at the tissue

(d) will interfere the transport.

Answer: (c)

8. In lungs there is definite exchange of ions between RBC and plasma. Removal of from blood involves

(a) Influx of Cl¯ ions into RBC

(b) Influx of ions into RBC.

(c) Efflux of Cl¯ ions into RBC.

(d) Efflux of ions into RBC.

Answer: (d)

9. Which of the following statement correctly defines “Bohr effects” ?

(a) Rise in Pco2 with a decrease in concentration.

(b) Rise in Pco2 with an increase in concentration.

(c) Rise in Pco2 with an increase in and decrease in Po2.

(d) Rise in Pco2 with a decrease in pH (concentration at which 50 % haemoglobin of blood is saturated with oxygen) .

Answer: (d)

10. In lungs in order to facilitate the removal of CO2 from the blood, there is an exchange of ions between RBC and the plasma which involves the movement of

(a) Chloride ions from RBC to plasma.

(b) Cl¯ ions from plasma to RBC.

(c) Bicarbonate ions from RBC to plasma.

(d) Cl¯ and bicarbonate ions as in (a) and (b) .

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