BREATHING AND EXCHANGE OF GASES Set 1

1.

Each haemoglobin molecule can carry maximum of

Two molecules of

Three molecules of

Four molecules of

One molecules of

NULL NULL NULL

2.

Hypoxia is caused due to

Lesser

in atmosphere Lesser RBC in blood Lesser

in atmosphere Both (a) and (b) NULL NULL NULL

3.

During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because

concentration is high and

is low

concentration is low and

is high

tension is low and

tension is high

tension is high and

tension is low NULL NULL NULL

4.

exchange with

by simple diffusion over the entire body surface takes place in
I. sponges
II. Coelenterates
III. Flatworms
Select the correct option to complete the given statement

I and II II and III I and III All of the above NULL NULL NULL

5.

Breathing involves ...A... during which atmospheric air is drawn in and ...B... by which the alveolar air is released out.
Choose the correct option for A and B to complete the given NCERT statement

A-expiration; B-osmosis A-expiration; B-inspiration A-inspiration; B-expiration A-inspiration; B-diffusion NULL NULL NULL

6.

If a large number of people are enclosed in a room, then

Oxygen decreases and carbon dioxide increases Oxygen increases and carbon dioxide decreases Both oxygen and carbon dioxide decreases Both oxygen and carbon dioxide increases NULL NULL NULL

7.

The total number of lobes and alveoli present in both the lungs of man are

17 and 30 million, respectively 5 and 300 million, respectively 19 and 300 million, respectively 18 and 300 lakh, respectively NULL NULL NULL

8.

Which of the following combines irreversibly with blood haemoglobin?

CO

NULL NULL NULL

9.

Identify the correct group of statements
I. Oxygen is carried by haemoglobin
II. Oxygen is carried by carbonic anhydrase
III.

is carried by haemoglobin
IV.

is carried by haemoglobin
V. Only oxygen is transported by the blood
VI. Only

is transported by the blood
Choose the correct option

I and VI II and III IV and V I and III NULL NULL NULL

10.

What is true about RBCs in humans?

They carry about 20-25 per cent of carbon dioxide They transport 99.5 per cent of oxygen They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma They do not carry carbon dioxide at all NULL NULL NULL

BREATHING AND EXCHANGE OF GASES Set 1

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BREATHING AND EXCHANGE OF GASES Set 1

Answer & Solution

Answer: Option B

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