Name the following:
(a) The vector of dengue fever.
(b) A vaccine produced by recombinant DNA technology.
(c) The type of immunity that is present at the time of birth.
(d) A fish that helps in eradication of mosquito larvae.

(i) List any two situations, when a medical doctor would recommend injection of preformed antibodies into the body of a patient. Name this kind of immunisation and mention its advantages.
(ii) Name the kind of immunity attained when instead of antibodies, weakened antigens are introduced into the body.

Health is the basic to life, and is essential for the good results in any sphere of life. A factory owner cannot expect the optimum output, if he does not employ healthy workers. A farmer cannot get optimum yield in his fields, if he is not healthy What does health actually mean? How is it related to our personal life & professional efficiency?

Some human diseases are transmitted only when the blood of a patient comes in contact with the blood of a healthy person. In one of such disease, there is a progressive decrease in the number of lymphocytes of the patient.
i) Name the disease & its causative agent
ii) Name the type of lymphocytes affected due to this infection.

Some international sports persons failed in dope tests& not allowed to participate in Olympics as they were drug abusers
i) Name the drugs that would have been taken by them.
ii) Why did they use such drugs?