Class 12 Biology · Chapter 9 · Test 1
First and Second Defence
39 MCQs
39 questions · 30 min · 39 marks
Want to try first? Take the free Biology test: Homeostasis and Feedback Mechanisms
Sample questions
The first 5 of 39. Try each one, then tap to see the answer.
Question 1
Which of the following is a part of the innate immune system?
- AT lymphocytes
- BB lymphocytes
- CSkin and mucous membranes
- DAntibodies
Show answerHide answer
Answer: C
Skin and mucous membranes belong to the first line of defence which is innate and present at birth.
Question 2
Which of these is not involved in the body's non-specific defence?
- ANatural killer cells
- BInflammatory response
- CAntibodies
- DComplement system
Show answerHide answer
Answer: C
Antibodies are part of the specific third line of defence.
Question 3
Skin offers an impenetrable barrier to microbes. It is categorized as:
- ANon-specific defence
- BSpecific defence
- CAcquired immunity
- DPassive immunity
Show answerHide answer
Answer: A
The first line of defence is a non-specific defence.
Question 4
How do the neutrophils kill microbes?
- ABy engulfing and digesting them
- BBy producing antibodies
- CBy releasing hormones
- DBy carrying oxygen to cells
Show answerHide answer
Answer: A
Neutrophils use phagocytosis along with chemicals and DNA fibre networks to kill pathogens.
Question 5
Which group of chemicals is involved in inflammatory response?
- AAntibodies
- BHistamines and prostaglandins
- CProstaglandins and pyrogens
- DAntibodies and pyrogens
Show answerHide answer
Answer: B
Infected or injured cells release histamines and prostaglandins that dilate blood vessels.
More tests in Immunity
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.