Available Answers

1. 1.

   Tick mark (√) the correct answers in the following

   1. Which one of the following can not prevent the entry of germs in the human body
      1. Mucus
      2. W.B.Cs
      3. R.B.Cs
      4. Skin
   2. Which one of the following is not true for local defence systems
      1. They start working instantaneously.
      2. They are not dependent on previous exposure to infections.
      3. They are effective against a wide range of potentially infectious agents.
      4. They secrete hydrochloric acid to kill the germs.
   3. Identify the antibiotics used in early 1940s to prevent many infections
      1. Aeromycin
      2. Sulphonamide
      3. Penicillin
      4. Ledermycin
   4. Which category of vaccine is against typhoid
      1. Killed germs
      2. Living weakened germs
      3. Living fully poisionus germs
      4. Toxoides
2. 2.

   1. Define the term 'immunity'.
   2. Name the two main categories of immunity
3. 3.

   Resistance to disease which an individual acquires during his/her life time is called "acquired immunity". Write two ways in which this type of immunity can be obtained.

4. 4.

   Write the chemical nature of antibodies. Name the chemical substance found on the germs against which antibodies are produced.

5. 5.

   Differentiate between Active and Passive immuity.

6. 6.

   Write the merits of local defence system.