Find the best tutors and institutes for Class 12 Tuition
Q14:
List the harmful effects caused by alcohol/drug abuse.
Solution :
1. Physiological and Neurological Consequences
Alcohol and drug abuse induce profound systemic toxicity, primarily affecting the Central Nervous System (CNS) and metabolic organs. Chronic consumption leads to:
- Hepatic Damage: Alcohol metabolism in the liver leads to acetaldehyde toxicity, causing fatty liver syndrome, hepatitis, and eventually cirrhosis [Per metabolic pathway analysis].
- Neuropsychiatric Impairment: Drugs act on the $GABA$ or $Dopamine$ receptors, leading to irreversible synaptic changes, cognitive decline, memory loss, and neurological disorders.
- Cardiovascular Stress: Sustained abuse leads to hypertension, arrhythmias, and increased risk of myocardial infarction [By cardiovascular hemodynamic principles].
2. Pathophysiological Risks: Infection and Immune Suppression
Intravenous drug abuse poses severe risks related to pathogen transmission and biological vulnerability:
| Factor | Mechanism |
|---|---|
| Immune Suppression | Chronic inflammation and oxidative stress reduce leukocyte efficacy. |
| Iatrogenic Infections | Use of shared needles leads to the transmission of blood-borne pathogens such as $HIV$ and $Hepatitis B$. |
3. Psychological and Behavioral Dysregulation
The abuse cycle is maintained by psychological dependency and withdrawal-induced stress:
- Addiction Cycle: Positive reinforcement (euphoria) transitions into negative reinforcement (avoiding withdrawal symptoms).
- Psychiatric Co-morbidity: Increased prevalence of anxiety, severe depression, paranoia, and suicidal ideation [Per DSM-5 diagnostic criteria for Substance Use Disorder].
- Social Alienation: Behavioral changes, including aggression and irritability, lead to the breakdown of familial and interpersonal bonds.
4. Visual Representation of the Physiological Impact Cycle
5. Socio-Economic and Legal Implications
Beyond individual health, the impact extends to the macro-social level:
- Economic Drain: Resources are diverted to habit sustenance rather than essential socio-economic development.
- Legal Consequences: Participation in criminal activity to finance habits, leading to incarceration and social stigma.
- Domestic Instability: Violence and financial insolvency within the family unit.
Final Solution: The harmful effects of alcohol and drug abuse are multi-dimensional, encompassing irreversible organ failure (specifically hepatic and neurological damage), heightened susceptibility to infectious diseases (such as $HIV$ and $Hepatitis$), severe psychiatric disorders, and catastrophic social and economic disintegration.
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?
- 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.
- 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
Super Tutor
Lalpur, Ranchi
9 yrs of
Exp
8 students
3119 hrs of classes completed
600
per hour
Online Classes
I am a qualified and dedicated teacher, having 10 years of teaching and research experience across different boards including CBSE, ICSE, IGCSE, IB, GCSE, and Australian Board. I specialize in guiding students from Class 8 to Post Graduation, helping them achieve academic excellence with a tailored and engaging teaching approach. I bring in-depth knowledge and expertise to my sessions. Qualifications: • Ph. D (Science) – BIT Mesra, Ranchi • CSIR UGC NET (2011) AIR-14 • ICAR NET (2010) • ICAR NET (2018) • GATE (2009) My student-centered approach focuses on assessing individual learning needs, bridging knowledge gaps, and fostering critical thinking through interactive methods like discussions, visual aids, and hands-on activities. Regular feedback and personalized guidance empower students to excel and develop a lifelong love for learning.
Top Tutor
Sector 49, Gurgaon
12 yrs of
Exp
1 student
1400
per hour
Student's Home
Focus is on building the fundamentals of both Accounting and economics and making it easy to understand. Have been delivering excellent and above anticipated results. A good score follows with better understanding of the concepts. Learning is fun with the way we do our classes. Must take a demo before making up the mind for starting or not to start the classes.
Sudhanshu Sir is an excellent economics teacher who explains every concept in a very simple and clear way. His teaching style makes even difficult topics easy to understand, and he is always patient while solving doubts. Thanks to his guidance, my interest and confidence in economics have improved a lot.
Top Tutor
T Nagar, Chennai
10 yrs of
Exp
5 students
1305 hrs of classes completed
700
per hour
Online Classes
I have over 10 years of experience teaching CBSE Class 12 Biology and Chemistry, helping students build a strong conceptual foundation while achieving excellent board examination results. My teaching methodology focuses on simplifying complex topics through clear explanations, logical reasoning, and regular practice. Every chapter is taught systematically from the NCERT textbook, ensuring students understand every concept thoroughly before progressing to application-based and board-level questions. My classes include detailed concept explanations, NCERT line-by-line learning, important diagrams, numerical problem-solving (Chemistry), previous years' board questions, competency-based questions, and chapter-wise assessments. I provide personalized attention by identifying each student's learning needs and adapting my teaching pace accordingly. Regular doubt-solving sessions, revision classes, mock tests, and performance analysis help students improve accuracy, confidence, and time management before the board examinations. My objective is not only to help students score high marks in the CBSE Class 12 Board Examination but also to develop a deep understanding of Biology and Chemistry, enabling them to confidently prepare for competitive examinations such as NEET. My classes are interactive, well-structured, and focused on helping every student achieve their academic goals through consistent guidance and disciplined practice.
Excellent coaching. She uses simple and easy methods to help students understand complex concepts. Thank you, ma'am, for your support in building my daughter's future.
Super Tutor
Mathara, Kozhikode
12 yrs of
Exp
23 students
914 hrs of classes completed
700
per hour
Online Classes
I have been teaching Physics for the past 18 years and I am passionate about making Physics simple, conceptual and accessible for every student. My academic background includes M.Sc. in Physics, B.Ed., SET, AWES CSB PGT Physics, and CTET qualifications. I worked as PGT Physics at APS Nasirabad, APS Roorkee, Kendriya Vidyalaya Banar, Rajasthan and Assistant Lecturer of Physics in Aakash Institute. My online classes are highly structured, interactive, and tailored to meet the individual comfort and academic requirements of students.
I had a good experience with Prajeesha Ma'am. She gives clear explanation and questions of all sorts including PYQs to help students understand practice the concept very well.
Top Tutor
Rajouri Garden, Delhi
10 yrs of
Exp
1 student
8 hrs of classes completed
1200
per hour
Online Classes
Student's Home
Tutor's home
I believe in delivering concepts and knowledge from the scratch so as to make the subject easy and relatable. My target is not only marks but rather developing an interest in the students for the subjects so as to have a better understanding and a good prospect for the future.
