Class 12 Biology Important Chapter 8 Human Health and Disease

Class 12 Biology Important Chapter 8 Human Health and Disease Solutions English Medium As Per The New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 12 Biology Important Solutions in English and select need one. AHSEC Class 12 Biology Additional Notes Download PDF. HS 2nd Year Biology Additional Solutions.

Class 12 Biology Important Chapter 8 Human Health and Disease

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 12 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 2nd Year Biology Important Solutions English Medium for All Chapters, You can practice these here.

Human Health and Disease

Chapter: 8

IMPORTANT QUESTION AND ANSWER

Answer the Following Question: 

1. Name the causative organism of typhoid.

Ans: Salmonella typhi.

2. Name the diagnostic test for AIDS.

Ans: ELISA (Enzyme Linked Immuno Sorbent Assay).

3. Name the vector for malaria.

Ans: Female Anopheles mosquito.

4. Which part of the body does Wuchereria bancrofti affect?

Ans: Lymphatic vessels.

5. Name the chemical released during allergic reactions.

Ans: Histamine.

6. Name  some non-communicable disease.

Ans: Cancer ,Diabetes , Hypertension.

7. What is the main target of HIV in the human body?

Ans: T-helper cells (CD4⁺ cells).

8. What is the causative organism of pneumonia?

Ans: Streptococcus pneumoniae or Haemophilus influenzae.

9. How does a vaccine protect the body from diseases?

Ans: Vaccines contain dead or weakened pathogens. When introduced into the body, they stimulate the immune system to produce antibodies against the disease-causing microbes. Memory cells formed during this process help the body respond quickly to future infections by the same pathogen, thereby preventing the disease.

10. What is innate immunity? Mention any two physical and chemical barriers.

Ans: Innate immunity is the non-specific defense mechanism present from birth. It provides the first line of defense.

(i) Physical barriers: Skin, mucous membranes of respiratory tract.

(ii) Chemical barriers: Saliva in the mouth, hydrochloric acid in the stomach.

11. Explain the principle and use of ELISA test.

Ans: ELISA (Enzyme Linked Immunosorbent Assay) is based on antigen-antibody interaction. It is used to detect the presence of HIV antibodies or antigens in the blood, helping in the diagnosis of AIDS. A change in color of the substrate indicates a positive result.

12. What are the effects of drug abuse on adolescents?

Ans: Drug abuse can lead to:

(i) Impaired physical and mental health.

(ii) Depression, anxiety, and mood swings.

(iii) Poor academic performance.

(iv) Risky behavior, accidents, and social isolation.

(v) Long-term addiction and organ damage.