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.

(i) False

Explanation: Immune system prevents the entry of germs. Only on failure, it deals with the germs that have entered.

(ii) False

Explanation: The antibodies attack specific antigens. They bind them self to the antigens and prevent its activity.

(iii) False.

Explanation: The systems of dogs and humans are different. The antigens or disease-causing substances have different effects on different systems.

(iv) True

Explanation:

Anti-venine injection is a short-term immunization technique. The antibodies are transferred.

(v) True

Explanation: The placenta is connected to the foetus through blood vessels. The antibodies can reach the foetus through the blood.

(vi) False

Explanation: Once somebody suffers from measles, he or she can never get it again as the antibodies are already present in their body.