Human Biology Questions

Assertion : Senescence is the time when age associated defects are manifested.Reason : Certain genes may be undergoing sequential switching on and off during one's life.

Assertion : Interferons are a type of antibodies produced by body cells infected by bacteria.Reason : Interferons stimulate inflammation at the site of injury.

Assertion : Organ transplantation patients are given immunosuppressive drugs.Reason : Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

Assertion : Persons suffering from haemophilia fail to produce blood clotting factor VIII.Reason : Prothrombin producing platelets in such persons are found in very low concentration.

Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.