Identify a, b and c in the schematic diagram of an antibody given here and answer the question :
(i) Write the chemical nature of a antibody.
(ii) Name the cells that produce antibodies in humans.
(iii) Mention the type of immune response provided by an antibody.

Protective proteinous chemical compounds produed by the immune cells in response to antigens are called antibodies, also called immunoglobulins. There are five classes of antibodies: IgA, IgD, IgE, IgG and IgM. Following diagram is that of a specific class of antibodies. Observe the diagram and answer the questions listed below the diagram: (i) To which class of antibodies, this antibody belongs to ? (ii) Identify the parts of the diagram labelled as A and B. (iii) Give the name of the part of antibody which binds the antigen. (iv) Which type of immune system is formed by the antibodies?

Read the given passage and answer the questions. In the following chemical reaction "zinc oxide reacts with carbon to produce zinc metal and carbon monoxide." ZnO +C to Zn + CO Name the type of reaction:

Study the following map and answer the questions given below: (i) Name the trans-continental railway shown in the given map. (ii) Name the terminal stations of this railway line. (iii) Mentioned any two characteristics of this railway line.