CBSE Class 12th Biology Chapter 8 - Human Health and Diseases Important Questions with Answers

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State the functions of mast cells in allergy response. (All India 2019)

Question 2.

State the function of interferons. (All India 2019)

Question 3.

Differentiate between the roles of B-lymphocytes and T-lymphocytes in generating immune responses. (Delhi 2019)

Question 4.

Principle of vaccination is based on the property of ‘memory’ of the immune system. Taking one suitable example, justify the statement. (Delhi 2019)

Question 5.

How do monocytes act as a cellular barrier in humans to provide innate immunity? (2018)

Question 6.

How do cytokine barriers provide immunity in humans? (2018)

Question 7.

Name two diseases whose spread can be controlled by the eradication of Aedes mosquito. (2018)

Question 8.

Why is the structure of an antibody molecule represented as HgLa ? Name any two types of antibodies produced in a human body. (2018C)

Question 9.

(i) Name the source plant of heroin drug. How is it obtained from the plant? (2018C)
(ii) Write the effects of heroin on the human body.20ia c

Question 10.

Suggest a method to ensure an anamnestic response in humans. (Delhi 2017)

Question 1.

Mention one application for each of the following
(i) Passive immunisation
(ii) Antihistamine
(iii) Colostrum
(iv) Cytokinin-barrier (All India 2017)

Question 2.

Name a human disease, its causal organism, symptoms (any three) and vector spread by intake of water and food contaminated by human faecal matter. (All India 2017)
Or
A patient is down with amoebiasis. List the symptoms that confirm this infection. Name the causative pathogen. (Delhi 2015c)

Question 3.

Why is there a fear amongst the guardians that their adolescent wards may get trapped in drug/alcohol abuse? (All India 2017)

Question 4.

Explain ‘addiction’ and ‘dependence’ in respect of drug/alcohol abuse in youth. (All India 2017)

Question 5.

It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.
(i) Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
(ii) By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality? (All India 2017)

Question 6.

Name the cells HIV (Human Immunodeficiency Virus) gains entry into after infecting the human body. Explain the events that occur in these cells. (All India 2016)
Or
How do macrophages in the human body act as HIV factory? (All India 2010)
Or
Name the cells that act as HIV factory in humans when infected by HIV. Explain the events that occur in the infected cell.

Question 7.

Name the causative organism of the disease amoebiasis. List three symptoms of the disease. (All India 2016)
Or
(i) Name the protozoan parasite that causes amoebic dysentery in humans.
(ii) Mention two diagnostic symptoms of the disease.
(iii) How is this disease transmitted to others? (All India 2016, Delhi 2012)

Question 8.

(i) Name any two causative organisms responsible for ringworm.
(ii) State any two symptoms of the disease. (Delhi 2016C)

Question 9.

(i) Name any two helminths which are known pathogenic to human.
(ii) List any two symptoms of the diseases caused by any one of them. (Delhi 2016)
Or
List the symptoms of ascariasis. How does a healthy person acquire this infection? (All India 2014)