Assertion :B-Lymphocytes produce an army of proteins against invading pathogen that are called antibodies Reason: The T-cells themselves do not secrete these antibodies but help B cell to produce them

Q. Following are the statements about B-lymphocytes. Identify which statements given below are correct?

I. They are a type of red blood cell.
II. Many B cells proliferate into cells called plasma cells that produce antibodies (proteins) necessary to fight off infections while other B cells mature into memory B cells.
III. B cells mature in the bone marrow.

Q. Fill in the blanks by selecting suitable terms given below : [4 MARKS]
(Carbohydrates, proteins, lymphocytes, erythrocytes, specific, antigen, white, blood, cells)
(i) Antibodies are .................
(ii) Antibodies are produced on exposure to ..................
(iii) Antibodies are produced by .......................
(iv) Antibodies act against a particular antigen. Thus, they are ...............

Q.

Q3. Look at the following statements about B Cells

1. They are a type of red blood cell of the lymphocyte subtype

2. Many B cells mature into what are called plasma cells that produce antibodies (proteins) necessary to fight off infections while other B cells mature into memory B cells.

3. B cells mature in the bone marrow, which is at the core of most bones

Which of the above statements are correct?

Q. Which of the following are the reason(s) with respect to rheumatoid arthritis are correct?

(i) Lymphocytes become more active
(ii) Body attacks self cells
(iii) More antibodies are produced in the body
(iv) The ability to differentiate pathogens or foreign molecules from self cells is lost

Q. Read the statements and choose the correct option.
I. Secretion of interferons is a physiological barrier of innate immunity.
II. T-lymphocytes are responsible for cell-mediated immunity.
III. Injection given against snake venom is a type of active immunization.
IV. Antibody produced during allergic reactions are of IgA type.