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12th Biology 2012 Set1 Outside Delhi Board Paper Solution

Question 15

Name the plant source of ganja. How does it affect the body of the abuser?
Name the two special types of lymphocytes in humans. How do they differ in their roles in immune response?

Cannabis (marijuana) is the plant source of ganja. Marijuana users who have taken large doses of the drug may experience an acute psychosis, which includes hallucinations, delusions, and a loss of the sense of personal identity. Other effects, which vary dramatically among different users, include heightened sensory perception (e.g., brighter colors), laughter, altered perception of time, and increased appetite.
The two types of lymphocytes are T cells and B cells. T cells are further divided into Helper T cells, Memory T cells and Cytotoxic T cell. B cells are also divided into memory B cells and plasma cells. T cells are involved in cell-mediated immunity, whereas B cells are primarily responsible for humoral immunity (relating to antibodies).