Question # 1

Amount of nitrogen in expired air is:

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70%

80%

79%

4%

The process of gaseous exchange involves.

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Break down of C-H bounds to yield energy.

Physical movements that take air ain and our of body

Getting oxygen from the air and removing carbon dioxide

Transport of oxygen by the blood to different parts of the body.

The primary chemical stimulus for breathing is the concentration of.

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Carbon dioxide in blood.

Oxygen in blood

Carbon oxide in muscles

Oxygen in muscles.

The structural and functional unit of lungs is:

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trachea

pharynx

broncioles

alveolus

The number of lobes in right lung is:

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1

2

3

4

Point out the FALSE statement about respiration.

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Gases can easily pass through the walls of the alveoli

Gas exchange in lungs is very efficient because lungs provide large surface area

In emphysema, the walls of alveoli break and there is more surface area.

Dust particles can damage the lung by irritating the inner alveoli surface.

In man the system of gaseous exchange is:

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digestive system

respiratory system

nervous system

excretory system

Most of the gaseous exchange in a leaf occurs through:

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Stomata

General surface

Cuticle

Lenticels

Which disease is involved in the breakdown of air sacs of the lungs?

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Bronchites

Emphysema

Pneumonia

Asthema

Smoking may also lead to the cancers in:

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Kidneys and pancreas

Oral cavity and larynx

Breast and bladder

All of them

Cartilage is absent in:

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larynx

trachea

bronchi

bronchioles

Where does the gaseous exchange occur in humans?

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Pharynx

Trachea

Bronchi

Alveoli

The length of trachia is __________ cm approximately:

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10

12

14

16

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