Question

Tobacco is smoked in cigarettes, cigars, and pipes. Research shows that tobacco-

related diseases kill nearly 13500 people worldwide every day. It is predicted that,

by 2020, tobacco-related diseases will cause 12% of all deaths globally.

Tobacco smoke contains many harmful substances. The most damaging

substances are tar, nicotine and carbon monoxide. Tobacco smoke is inhaled into

the lungs. Tar from the smoke is deposited in the lungs and this prevents the lung

from working properly. Some people use nicotine patches to help them to give up

smoking. The patches are put on skin and they release nicotine into the blood. This

helps to relieve cravings and withdrawal symptoms when people have stopped

smoking.

1x4

(i) To study the effectiveness of nicotine patches, a group of 50 smokers is chosen

randomly. The group is to be studied for six months. The effectiveness of the

nicotine patches is to be measured by finding out how many people in the group

have not resumed smoking by the end of the study. Which one of the following

represents the appropriate experimental design?

(a) All the people in the group use the patches.

(b) All use patches except one person who tries to give up smoking without

them.

(c) People choose whether or not they will use patches to help giving up

smoking.

(d) Half are randomly chosen to use patches and the other half does not use them.

(ii) During respiration exchange of gases take place in

(a) trachea and larynx

(b) alveoli of lungs

(c) alveoli and throat

(d) throat and larynx

(iii) Which among the following is an important function of lungs?

(a) transfer oxygen to the blood

(b) filter the metabolic wastes from blood

(c) produce important hormones

(d) sends nerve impulse to the brain

(iv) Tobacco smoke does not contain the following harmful substance

(a) Tar

(b) Nicotine

(c) Urea

(d) Carbon monoxide

(v) Trachea do not collapse when there is not much air because they are

(a) thick and muscular

(b) having cartilaginous rings

(c) have valves

(d) supported by larynx

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Answer 1

Answer:

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