Find the best tutors and institutes for Class 12 Tuition
Q2:
In which way has the study of biology helped us to control infectious diseases?
Solution :
1. Conceptual Foundation of Disease Control
The study of biology serves as the cornerstone for mitigating infectious diseases by providing a granular understanding of pathogen biology, host-pathogen interactions, and the epidemiological dynamics of infection. This enables the transition from reactive treatment to proactive prevention and eradication.
2. Key Biological Methodologies in Disease Control
- Immunology and Vaccination: By understanding the humoral and cell-mediated immune responses, biologists have developed vaccines that introduce attenuated or inactivated pathogens, or their antigenic proteins, into the body. This triggers the production of memory B and T cells [Per the Principle of Immunological Memory].
- Pharmacology and Antimicrobial Development: Through the identification of unique metabolic pathways in microbes (e.g., cell wall synthesis in bacteria, viral protease inhibitors), biologists have engineered antibiotics, antivirals, and antifungals that exhibit selective toxicity toward pathogens while minimizing host damage.
- Genomics and Molecular Diagnostics: Techniques like Polymerase Chain Reaction (PCR) and Enzyme-Linked Immunosorbent Assay (ELISA) allow for the rapid, specific detection of sub-clinical infections. This facilitates early quarantine and break-chain transmission strategies [Per the Central Dogma of Molecular Biology].
- Vector Biology and Eradication: By mapping the life cycles of vectors (e.g., Anopheles mosquito for Malaria, Aedes aegypti for Dengue), public health authorities can implement targeted environmental management, such as the elimination of breeding sites and the use of biological control agents like Gambusia fish.
3. Comparative Analysis of Biological Interventions
| Mechanism | Biological Objective | Resulting Outcome |
|---|---|---|
| Vaccination | Induction of acquired immunity | Long-term host protection |
| Antibiotics | Interruption of bacterial metabolism | Elimination of current infection |
| Public Hygiene | Disruption of pathogen transmission | Prevention of disease spread |
4. Mathematical/Statistical Modeling of Disease Spread
Biology integrates with mathematics to model the Basic Reproduction Number ($R_0$), defined as the expected number of secondary cases produced by a single infection in a completely susceptible population.
$R_0 = \beta \cdot c \cdot d$
Where:
- $\beta$: Probability of infection per contact
- $c$: Contact rate
- $d$: Duration of infectiousness
[Justification: By biologically shortening the duration of infectiousness ($d$) through treatment, the overall $R_0$ is reduced, leading to the decay of the epidemic curve.]
5. Visualizing the Pathogen Life Cycle Intervention
Final Solution: The study of biology has enabled the control of infectious diseases by facilitating the development of vaccines for prophylactic immunity, molecular diagnostic tools for early intervention, effective antimicrobial therapeutics, and a deep understanding of vector life cycles to prevent transmission, all of which work collectively to lower the $R_0$ and eradicate pathogens within populations.
More Questions from Class 12 Biology Human Health and Disease EXERCISES
- Q1: What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q1: What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q2: In which way has the study of biology helped us to control infectious diseases?
- Q3(a): How does the transmission of each of the following diseases take place? (a) Amoebiasis
- Q3(a): How does the transmission of each of the following diseases take place? (a) Amoebiasis
- Q3(b): How does the transmission of each of the following diseases take place? (b) Malaria
- Q3(b): How does the transmission of each of the following diseases take place? (b) Malaria
- Q3(c): How does the transmission of each of the following diseases take place? (c) Ascariasis
- Q3(c): How does the transmission of each of the following diseases take place? (c) Ascariasis
- Q3(d): How does the transmission of each of the following diseases take place? (d) Pneumonia
- Q3(d): How does the transmission of each of the following diseases take place? (d) Pneumonia
- Q4: What measure would you take to prevent water-borne diseases?
- Q4: What measure would you take to prevent water-borne diseases?
- Q5: Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.
- Q5: Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.
- Q6: Name the primary and secondary lymphoid organs.
- Q6: Name the primary and secondary lymphoid organs.
- Q7(a): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (a) MALT
- Q7(a): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (a) MALT
- Q7(b): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (b) CMI
- Q7(b): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (b) CMI
- Q7(c): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (c) AIDS
- Q7(c): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (c) AIDS
- Q7(d): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (d) NACO
- Q7(d): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (d) NACO
- Q7(e): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (e) HIV
- Q7(e): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (e) HIV
- Q8(a): Differentiate the following and give examples of each: (a) Innate and acquired immunity
- Q8(a): Differentiate the following and give examples of each: (a) Innate and acquired immunity
- Q8(b): Differentiate the following and give examples of each: (b) Active and passive immunity
- Q8(b): Differentiate the following and give examples of each: (b) Active and passive immunity
- Q9: Draw a well-labelled diagram of an antibody molecule.
- Q9: Draw a well-labelled diagram of an antibody molecule.
- Q10: What are the various routes by which transmission of human immuno-deficiency virus takes place?
- Q10: What are the various routes by which transmission of human immuno-deficiency virus takes place?
- Q11: What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
- Q11: What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
- Q12: How is a cancerous cell different from a normal cell?
- Q12: How is a cancerous cell different from a normal cell?
- Q13: Explain what is meant by metastasis.
- Q13: Explain what is meant by metastasis.
- Q14: List the harmful effects caused by alcohol/drug abuse.
- Q14: List the harmful effects caused by alcohol/drug abuse.
- Q15: Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?
- Q15: Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?
- Q16: Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
- Q16: Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
- Q17: In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
- Q17: In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
CBSE Solutions for Class 12 Biology Human Health and Disease
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
Top Tutors who teach Human Health and Disease
Top Tutor
New Town, Kolkata
15 yrs of
Exp
13 students
20 hrs of classes completed
130
per hour
Online Classes
Tutor's home
I am a strong believer in concept-based gain of knowledge. I start from scratch while teaching the very basic concepts and take my students to a level where they have a deep understanding of the subject. Once they understand the concept, the next step is that practice a lot of questions/numerical/problem in the class itself as practice is the key to retain knowledge. I refer to prescribed books by CBSE/ICSE board considering board exams but always encourage students to refer additional 1 or 2 books (like H C Verma/ B M Sharma/ D C Pandey) for JEE/NEET based on their speed to practice. In last I provide them enough homework to practice at home and send me the doubts before the next class. As 12th being the boards exams, we prepare right from beginning by covering the previous year questions too and providing enough adhoc classes
Rakesh Sir's Classes were truly Useful and the way he explains concepts is very Good and Is Easy to Understand so I Shall Highly Recommend anyone to Join the Sessions.
Top Tutor
Nerul, Mumbai
10 yrs of
Exp
5 students
632 hrs of classes completed
500
per hour
Online Classes
Student's Home
Tutor's home
For classes 11 and 12, I have experience in teaching core mathematics subjects such as Relations & Functions, Calculus, Vectors, Probability, and more, under the CBSE curriculum. I ensure clarity in concepts, regular practice, and step-wise problem-solving strategies. I emphasize board exam preparation along with competitive exam orientation (CUET, NDA, JEE Main basics). My classes are known for being structured, student-friendly, and focused on individual doubt clearance. Regular assessments, feedback, and revision help students gain confidence and improve performance. I also coordinate with parents and provide progress updates to ensure consistent academic growth.
We had a very positive experience with Saurav Sir, who helped my son with Grade 12 NIOS Mathematics. He was patient, explained concepts clearly and followed a well structured approach that made learning much easier. My son felt more confident & comfortable with the subject after his sessions. He required flexibility in timings and sir did his best to accommodate him. Would definitely recommend Saurav Sir for anyone looking for a supportive and effective Math tutor
Top Tutor
Sultanpur Viran, Sultanpur Viran
9 yrs of
Exp
11 students
1105 hrs of classes completed
1200
per hour
Online Classes
Student's Home
Tutor's home
I have a teaching experience of 9+ years. Currently teaching in St. Mary's Convent School. My way of teaching is simple and friendly as per the requirement. I lay emphasis on the basics because that only helps to make the concepts more easier to understand.
Top Tutor
Uttam Nagar, Delhi
10 yrs of
Exp
2 students
132 hrs of classes completed
1000
per hour
Online Classes
Student's Home
Efficient professional with 9+ years of experience and proven knowledge of lectures, training and development, and adaptive teaching methods. I aim to leverage my skills to successfully fill the significant role of a teacher in your life. Also, through my experience, I have developed interactive teaching methods that can help you understand every concept's very applicability, enabling you to correlate the readings with practical situations.
I will always be grateful for the time and effort you put into teaching me. Your passion for education is truly infectious!
Top Tutor
Bajaj Nagar, Nagpur
3 yrs of
Exp
Online Classes
Student's Home
Only the students attitude makes a subject HARD or EASY. FUNDAMENTALS are the only need for all Competitive Exams. Once you GET it, cant be bothered again.
