Class 12 Biology · Chapter 9 · Test 2
Third Defence and Immunity
39 MCQs
39 questions · 35 min · 39 marks
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Sample questions
The first 5 of 39. Try each one, then tap to see the answer.
Question 1
Which of these are known for stimulating an immune response?
- APathogens
- BAntigens
- CAntibodies
- DHistamines
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Answer: B
Antigens are foreign molecules recognized by T and B cells.
Question 2
What is the difference between B cells and T cells?
- AB cells make antibodies and T cells destroy infected cells
- BB cells and T cells do the same work
- CB cells attack germs directly and T cells make antibodies
- DB cells fight germs in body fluids and T cells work inside cells
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Answer: A
Plasma cells from B cells make antibodies while cytotoxic T cells kill infected cells.
Question 3
Which type of white blood cell is responsible for producing antibodies?
- ANeutrophils
- BB lymphocytes (B cells)
- CMacrophages
- DNatural killer cells
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Answer: B
B cells divide into plasma cells that secrete antibodies.
Question 4
Cell-mediated immunity works best against:
- AViruses infected cells and toxic molecules
- BViruses and toxic molecules
- CVirus infected cells and cancer cells
- DToxic molecules and cancer cells
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Answer: C
Cytotoxic T cells destroy infected and abnormal body cells.
Question 5
The third line of defence is provided by the:
- ASkin
- BImmune system
- CMucous membranes
- DStomach acids
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Answer: B
It is a specific defence that remembers previous invaders.
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