Class 11

4. Breathing and Exchange of Gases question bank (Zoology)

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Q1.

Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:  

(A)
As bicarbonate ions
(B)
In the form of dissolved gas molecules
(C)
By binding to R.B.C.
(D)
As carbamino-haemoglobin
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Q2.

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?  

(A)
Rising CO_2 concentration
(B)
Falling CO_2 concentration
(C)
Rising CO_2 and falling O_2 concentration
(D)
Falling O_2 concentration
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