CBSE Class 12 Biology HOTs Biology in Human Welfare

Refer to CBSE Class 12 Biology HOTs Biology in Human Welfare. We have provided exhaustive High Order Thinking Skills (HOTS) questions and answers for Class 12 Biology Biology in Human Welfare. Designed for the 2026-27 exam session, these expert-curated analytical questions help students master important concepts and stay aligned with the latest CBSE, NCERT, and KVS curriculum.

Analytical Questions: Biology in Human Welfare (Class 12 Biology)

Every Class 12 Biology student should practice these HOTS Questions to tackle difficult exam problems. Use the provided solutions to improve your critical thinking and boost your overall performance in Class 12.

Class 12 Biology Biology in Human Welfare Advanced HOTS Questions

Q.1 All human beings have Proto oncogenes.
But all of them do not suffer from cancer. Why? (1)
Hint. Proto oncogene does not express itself.
 
Q.2. Do you agree that infected cells of our body can protect the non infected cells? If yes, how?
Hint.Through interferons (1)
 
Q..3Why is it organ transplantation always done between very close relatives? (1)
Hint.Histocompatability to be seen
 
Q.Q.. Against which diseases does the MMR vaccine give protection? (1)
Ans.Measels, Mumps, Rubeolla
 
Q.6. Expand NACO. (1)
Ans. National AIDS control Organization
 
Q.7. Which day is observed as World AIDS Day? (1)
Ans. December 1
 
Q.8. Name the disease that is caused due to abnormal increase in Lymphocytes of blood. (1)
Ans. Leukemia/Blood cancer
 
EACH QUESTION CARRIES 2 MARKS
 
Q.9. A person suffering from Elephantiasis has an abnormally increased swelling in his lower limbs. What could be the reason for the swelling?
Hint: Affect on the lymphatic vessels.
 
Q.10. Why do sports persons often fall victims to Cocaine addiction. (2)
Hint; Effect on CNS – increase in energy
 
Q.11. Chewing of Tobacco causes increase in blood pressure. Justify. (2)
Hint: Role of nicotine.
 
Q.12. Complete the blank spaces: (2)
 
Type of pathogen                   Name of pathogen                      symptoms                           Disease name
I) a ---------------                     Entamoeba                            Abdominal pain                    b . -------------
II) Bacteria                             c. ------------                           Respiratory problem            d. --------------
 
Q.13. Why should one take an immuno suppressants agent all through his life after an organ transplantation?(2)
Hint: Body able to differentiate the self and non-self at any time and reject the grafted the part.
 
Q.14. Complete the following. (2)
TB:Airborne :: Malaria: ---------
Colostrum : Passive immunity :: Vaccine : -----------
 
Q.15. Master X has the habit of taking pain killers for mild headache. He is advised not to take painkillers frequently by his family doctor. What could be the probable reason.
 
Q.16. Classify the following drugs into their respective groups (2)
Smack, Hashish, Heroin and Charas
Ans: Opioids and Cannabinoids
 
Q.15. What do you mean by Red Ribbon Express? (2)
Express train launched by Indian Railways recently to create awareness about AIDS. This train was taken all over India and stationed at different Junctions.
 
Q.16. A person suffers from dry, scaly lesions on his skin, nails and scalp which is accompanied by intense itching.
i. What is the disease he is suffering from?
ii. How would he have contracted the disease?
 
EACH QUESTION CARRIES 3 MARKS
 
17. How do drugs cause addiction to a person who consumes them? (3)
 
Q.18. Immune system has memory component. How does man make use of it to control disease? (3)
 
Q.19. Classify the following under the four types of barriers in innate immunity.(3)
Interferons
P M N L neutrophils
Saliva in mouth
Acid in Stomach
Mucous coating in Windpipe
Natural killer cells
 
Q.20. A person has been biten by a poisonous snake. He is rushed to the doctor for an urgent immune response.(3)
a) What did the doctor immediately do?
b) What kind of immunisation was he provided to get immediate response?
c) Define this kind of immunity.
 
Q.21.. Differentiate between a depressant and a stimulant (3 points) (3)
 
Q.22. State few very effective measures recently taken by the Ministry of Health to control the use of Cigarette.
 
Q.23.. B-Lymphocytes form humoral immune system. Justify. (3)
Hint: B-lymphocytes – plasma cells – antibodies – circulate in blood (body fluid)
 
Q.24. Differentiate B Cells and T Cells (3)
 
Q.25. Distinguish the Primary response and Secondary response. (3)
 
Q.26. Go through the statements and complete the sequence. (3)
Mosquito bites a healthy human and injects Sporozoites.
Sporozoites reach the a) ------------ through b) --------------
Reproduces c) --------------- burst the cells and release into blood.
Enter the d) ----------------
Reproduce asexually and release by bursting.
The cell release e) ---------- responsible for fever
Some of them form -------- that are picked by mosquito when it bites.
(Refer NCERT text book page 148/Fig 8.1)
 
Q.27. Explain the mode of action of the following: (3 marks)
a) Opioids b) Cannabinoids c) Cocaine

Free study material for Biology

Higher Order Thinking Skills (HOTS) for Class 12 Biology Biology in Human Welfare

Preparing with Biology in Human Welfare HOTS Exercises

Master core concepts in Biology in Human Welfare with these targeted Higher Order Thinking Skills (HOTS) problems. Built for Class 12 Biology students following the CBSE curriculum, these exercises challenge analytical thinking and improve problem-solving speed.

Verified Solutions for Better Concept Clarity

Pair these practice sets with our comprehensive NCERT solutions for Class 12 Biology to clear up doubts. Checking your working against our detailed explanations guarantees absolute mastery over this chapter.

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FAQs

Where can I download the latest PDF for CBSE Class 12 Biology HOTs Biology in Human Welfare?

You can download the teacher-verified PDF for CBSE Class 12 Biology HOTs Biology in Human Welfare from StudiesToday.com. These questions have been prepared for Class 12 Biology to help students learn high-level application and analytical skills required for the 2026-27 exams.

Why are HOTS questions important for the 2026 CBSE exam pattern?

In the 2026 pattern, 50% of the marks are for competency-based questions. Our CBSE Class 12 Biology HOTs Biology in Human Welfare are to apply basic theory to real-world to help Class 12 students to solve case studies and assertion-reasoning questions in Biology.

How do CBSE Class 12 Biology HOTs Biology in Human Welfare differ from regular textbook questions?

Unlike direct questions that test memory, CBSE Class 12 Biology HOTs Biology in Human Welfare require out-of-the-box thinking as Class 12 Biology HOTS questions focus on understanding data and identifying logical errors.

What is the best way to solve Biology HOTS for Class 12?

After reading all conceots in Biology, practice CBSE Class 12 Biology HOTs Biology in Human Welfare by breaking down the problem into smaller logical steps.

Are solutions provided for Class 12 Biology HOTS questions?

Yes, we provide detailed, step-by-step solutions for CBSE Class 12 Biology HOTs Biology in Human Welfare. These solutions highlight the analytical reasoning and logical steps to help students prepare as per CBSE marking scheme.