Chapter Exam

Chapter 11: Immunology — Online MCQ Test

Q: Which of the following is an example of innate immunity?

Answer: B. Skin acting as a physical barrier — Innate immunity is the inborn, non-specific defense of the body. Skin forms the first line of defense as a physical barrier.

Q: The cells mainly responsible for producing antibodies are

Answer: B. B lymphocytes — B lymphocytes differentiate into plasma cells, which secrete antibodies. This is a key part of humoral immunity.

MICROBIOLOGY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 11: Immunology with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th MICROBIOLOGY. This chapter covers: This chapter investigates the body defense mechanisms against foreign invaders. It covers innate and adaptive immunity immune system organs antigen properties antibody structures a.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 11: Immunology — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th MICROBIOLOGY — Chapter 11: Immunology, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an example of innate immunity?

A. Antibody production after vaccination
B. Skin acting as a physical barrier ✓
C. Memory cell formation
D. Tissue-specific immune response after infection

Answer: B. Skin acting as a physical barrier
Innate immunity is the inborn, non-specific defense of the body. Skin forms the first line of defense as a physical barrier.

The cells mainly responsible for producing antibodies are

A. Erythrocytes
B. B lymphocytes ✓
C. Neutrophils
D. Platelets

Answer: B. B lymphocytes
B lymphocytes differentiate into plasma cells, which secrete antibodies. This is a key part of humoral immunity.

Which statement best describes adaptive immunity?

A. It is present from birth and is non-specific
B. It acts immediately without prior exposure
C. It develops after exposure to a specific antigen ✓
D. It depends only on skin and mucous membranes

Answer: C. It develops after exposure to a specific antigen
Adaptive immunity is antigen-specific and develops after the body encounters a particular pathogen or antigen. It also forms memory.

Which sequence correctly shows the flow of immune response in adaptive immunity?

A. Antibody production → Antigen recognition → Memory cell formation
B. Antigen recognition → Lymphocyte activation → Antibody production ✓
C. Memory cell formation → Antigen entry → Antibody production
D. Antigen entry → Antibody destruction → Lymphocyte death

Answer: B. Antigen recognition → Lymphocyte activation → Antibody production
Adaptive immunity begins with recognition of the antigen, followed by activation of lymphocytes and then antibody production. Memory cells may form after the response.

Which statement about antibodies is most accurate?

A. All antibodies are identical in structure and function
B. Antibodies are proteins produced by B-cells and are specific to antigens ✓
C. Antibodies are lipids that destroy pathogens directly
D. Antibodies are only present before birth

Answer: B. Antibodies are proteins produced by B-cells and are specific to antigens
Antibodies are immunoglobulin proteins secreted by plasma cells derived from B-lymphocytes. Each antibody is specific to a particular antigen.