Q1 of 35 Page 180

Give one example of each of the following:

(i) Germ-killing body secretion ………………………….


(ii) Germ trapping body secretion ……………………….


(iii) The mechanical barrier that prevents entry of germs into the body ……………………..

(i) Sweat


Explanation:


A new antibiotic has been found in the sweat of human beings. This is considered to kill bacteria, among other germs.


(ii) Mucus


Explanation: Mucus is a slimy secretion that traps bacteria and hence preventing their entry further.


(iii) Skin


Explanation:


Skin is a physical barrier between our body and the dirt and bacteria from outside.


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2

Mention if the following statements are True (T) or False (F):

(i) The immune system deals with the germs after they have entered the body.


(ii) Antibodies eat up the germs.


(iii) Human beings can suffer from all those diseases which attack dogs.


(iv) Anti-venine injection against snake bite is an example of artificially acquired passive immunity.


(v) Mother’s antibodies may reach the foetus through the placenta.


(vi) A person having once suffered from measles usually gets repeated attacks.

 1

Define the term prophylaxis.

 2

Name the four categories of materials for preparing vaccines.

 3

Name the diseases prevented by:

(i) Salk’s vaccine …………………………………


(ii) BCG vaccine …………………………………


(iii) DTP vaccine ……………………………………