Immune defences involve several related terms, cells, substances, and ways immunity develops. This quiz asks you to separate close concepts, recognize immune-cell functions, and work through questions about first-line and second-line defences, specific immunity, and acquired immunity. Expect direct knowledge, comparisons, terminology distinctions, and questions that ask you to connect related ideas.
What This Quiz Covers
- Immune threats and major immunity classifications
- First-line and second-line defences, including mechanical, chemical, reflex, phagocyte, inflammation, fever, and phagocytosis topics
- Specific immunity, antibodies, antigens, and lymphocytes
- B-cell and T-cell functions
- Genetic, active, and passive immunity, including natural and artificial acquisition, vaccines, and immune globulin
How to Use This Quiz
Answer each question as if you were writing a multiple-choice test. Read every answer choice before choosing the best response.
Use 80% or higher as a personal study target for this practice quiz.
After finishing, review the explanations for every question you missed.
Each attempt shows 12 random questions from a larger bank containing 30 questions.
Start the Quiz!
Results
You passed, great job!
Your result shows solid understanding of the immune defences, immune cells, and types of immunity tested here. If any questions felt uncertain, review that area for understanding, then try another attempt for a different selection from the question bank.
You’re not there yet, but you’re getting practice.
Review the explanations, look at the questions you missed, then try again. Mistakes show you what to study next.
Need a refresher before retaking it? Study this topic here.
#1. Which classification of immunity is correct?
Correct answer: B. Immunity is genetic or acquired, and acquired immunity can be natural or artificial
Explanation: Immunity to diseases can be classified as genetic or acquired. Acquired immunity can then develop naturally or artificially.
Why A is wrong: Natural immunity falls under acquired immunity rather than forming the main pair with genetic immunity.
Why C is wrong: Active immunity is a form of natural acquired immunity.
Why D is wrong: Passive and specific immunity belong to different classification levels.
#2. Which statement correctly distinguishes an antibody from an antigen?
Correct answer: B. An antibody recognizes and attacks unwanted substances, while an antigen triggers antibody production
Explanation: Antibodies recognize and attack abnormal or unwanted substances. Antigens are unwanted substances that cause the body to produce antibodies.
Why A is wrong: It reverses the roles of antibodies and antigens.
Why C is wrong: White blood cells and antibody-producing cells describe lymphocytes rather than antibodies or antigens.
Why D is wrong: Digestion and histamine release describe other defence mechanisms.
#3. Which description best matches phagocytes?
Correct answer: B. White blood cells that digest and destroy unwanted substances
Explanation: Phagocytes are white blood cells that digest and destroy microorganisms and other unwanted substances. The other choices describe B cells, antigens, or antibodies.
Why A is wrong: B lymphocytes cause antibody production in plasma.
Why C is wrong: Antigens cause the body to produce antibodies.
Why D is wrong: Antibodies recognize and attack unwanted substances.
#4. Which pair consists of mechanical barriers?
Correct answer: D. Intact skin and mucous membranes
Explanation: Intact skin and mucous membranes act as mechanical barriers in the first line of defence.
Why A is wrong: Tears and saliva are chemical barriers.
Why B is wrong: Coughing and sneezing are reflex defences.
Why C is wrong: Phagocytes and inflammation belong to the second line of defence.
#5. Which statement best defines immunity?
Correct answer: D. Protection against a disease or condition
Explanation: Immunity means protection against a disease or condition. The other choices describe specific forms or types of immunity.
Why A is wrong: This describes nonspecific immunity.
Why B is wrong: This describes specific immunity.
Why C is wrong: This describes naturally acquired passive immunity.
#6. Which statement best distinguishes specific immunity from nonspecific immunity?
Correct answer: D. Specific immunity targets a certain disease, while nonspecific immunity reacts to unrecognized substances
Explanation: Specific immunity focuses on a certain disease or infection. Nonspecific immunity reacts to substances the body does not recognize as normal.
Why A is wrong: It reverses the distinction between specific and nonspecific immunity.
Why B is wrong: Maternal transfer and vaccination describe acquired immunity rather than this distinction.
Why C is wrong: Genetic and active immunity are different classifications.
#7. Which statement correctly compares naturally acquired active and passive immunity?
Correct answer: C. Active immunity follows illness and antibody development, while passive immunity is short-lived maternal transfer
Explanation: Naturally acquired active immunity develops after acquiring an illness and producing antibodies. Naturally acquired passive immunity is short-lived and comes from maternal transfer.
Why A is wrong: It reverses active and passive natural immunity.
Why B is wrong: Donor antibodies describe artificially acquired passive immunity.
Why D is wrong: Species protection is genetic immunity, and vaccination is artificial acquisition.
#8. Which set contains only second-line defences?
Correct answer: D. Phagocytes, inflammation, fever
Explanation: Phagocytes, inflammation, and fever form the second line of defence. The other choices include a first-line defence.
Why A is wrong: Mucous membranes are a first-line mechanical barrier.
Why B is wrong: Chemical barriers belong to the first line.
Why C is wrong: Reflexes belong to the first line.
#9. Which group contains only examples of threats the immune system helps defend against?
Correct answer: B. Pollen, toxins, bacteria, viruses, abnormal cells
Explanation: The immune system protects against outside threats such as pollen, toxins, bacteria, and viruses, as well as abnormal cells from within the body. The other choices mix threats with substances or cells involved in immune defence.
Why A is wrong: Antibodies take part in immune defence rather than acting as a listed threat.
Why C is wrong: Histamine and lymphocytes take part in immune responses rather than acting as the listed threats.
Why D is wrong: Saliva and antibodies contribute to defence rather than belonging to the listed threats.
#10. Which pair names the two main defence mechanisms of immunity?
Correct answer: A. Nonspecific and specific
Explanation: The body’s two defence mechanisms are classified as nonspecific immunity and specific immunity. The other pairs describe different classifications within immunity.
Why B is wrong: Active and passive describe forms of acquired immunity.
Why C is wrong: Genetic and acquired classify immunity to diseases in another way.
Why D is wrong: Natural and artificial describe ways acquired immunity develops.
#11. A cat does not catch chickenpox from a person. Which type of immunity does this illustrate?
Correct answer: D. Genetic immunity
Explanation: Genetic immunity protects a member of one species from diseases that affect another species. The cat and chickenpox example illustrates this species-based protection.
Why A is wrong: Active immunity follows naturally acquiring an illness.
Why B is wrong: Passive natural immunity involves maternal transfer.
Why C is wrong: Artificially acquired immunity involves vaccine or immune globulin injection.
#12. Which statement correctly describes both phagocytosis and fever?
Correct answer: A. Phagocytosis engulfs cells, and fever stimulates it while limiting some pathogen multiplication
Explanation: Phagocytosis involves ingesting or engulfing other cells. Fever stimulates phagocytosis and decreases the ability of certain pathogens to multiply.
Why B is wrong: The description of phagocytosis fits, but histamine release describes inflammation rather than the stated effect of fever.
Why C is wrong: Fever has the stated effect on certain pathogens, but antibody production is not phagocytosis.
Why D is wrong: Toxic substances near invading cells describe killer T-cell activity rather than phagocytosis.
How to Read Your Score
Your score shows how well you understood the material in that attempt. Use 80% or higher as a personal study target for this website quiz, not as an official passing score. A score of 80% or higher shows strong understanding of the material tested. A score from 60% to 79% points to areas that need more review. Below 60%, return to the matching study notes before another attempt. Since each attempt uses random questions, your next attempt might include a different selection. Use these ranges only to guide your study decisions.
What Your Mistakes Might Show
Look at the kinds of questions you missed, not only the total number. Missed comparison or terminology-distinction questions might point to trouble separating first-line and second-line defences, specific and nonspecific immunity, or active and passive immunity. Missed anatomy or function questions might signal a need to review related immune cells and substances. Missed cause-and-effect or two-step judgment questions might point to uncertainty about relationships among immune-response processes. Direct knowledge or definition mistakes might show that key classifications or terms need another look. Treat these patterns as review clues, not proof that you do not understand the whole topic.
Questions You Guessed On Matter Too
Do not review only the questions you missed. Mark questions you guessed on, changed several times, found difficult, or answered correctly without feeling confident. A correct guess raises your score, but it does not always show confident understanding. Review those uncertain questions too. Check why the correct response fits and why the closest wrong answer choice does not fit.
Review and Retake
- Read the explanation for each question you missed.
- Identify why the wrong answer choice you selected seemed correct.
- Include questions you guessed on or felt unsure about.
- Review the matching section of the study notes.
- Explain the correct answer in your own words.
- Return later for another attempt after reviewing.
Focus on understanding the reason behind each response instead of memorizing answers from an earlier attempt. If an area still feels unclear, leave some time for review before you retake the quiz.
Track Your Quiz Progress
The quiz displays your score for the current attempt, but it does not keep a detailed study log. Record your date, score, one or two areas that caused trouble, and questions you guessed on or felt unsure about. Use a notebook, planner, spreadsheet, or note on your phone. Another attempt might include a different selection of questions, so small score changes are normal. Look for stronger understanding and fewer uncertain answers over time instead of focusing on one perfect score.
A lower score gives you a useful place to focus. Pick one immune-defence or immunity area that caused trouble, review it for understanding instead of memorizing answers, then return for another attempt when the ideas feel clearer.
Continue Studying
Review this topic again or return to the wider Nova Scotia CCA exam study plan.