Q.(a) A time-bound vaccination programme is followed for the children in our country from their birth up to ten years of age. A graph plotted below shows the effect of the vaccination followed by infection by the same pathogen, and the antibody concentration in the blood of the child.
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🔒 Start your 14-day free trial to unlock the full solution →Part (a)Concept understanding — Public Health Interventions
Let’s start with something you already know. When you feel a cold coming on, you might wash your hands more often, cover your mouth while coughing, or take a vitamin C tablet. You are not waiting to get sick — you are trying to stop the cold before it starts, or at least make it less severe. That instinct — to act before illness strikes, or to contain it once it appears — is the seed of public health interventions.
Now, scale that up from one person to an entire village, city, or country. A public health intervention is any organised action — taken by the government, a community, or an international body — that aims to prevent disease, prolong life, and promote health across a population. It is not about treating one patient in a clinic; it is about changing conditions for everyone.
The precise meaning
The NCERT textbook (Class 12, Economics — Indian Economic Development, Chapter 8: Infrastructure) introduces health as a critical part of infrastructure. It states that public health encompasses sanitation, clean drinking water, and preventive healthcare — not just hospitals and doctors. A public health intervention, therefore, is a deliberate, evidence-based measure designed to improve health outcomes at the population level. It can be a policy (like banning smoking in public places), a programme (like a vaccination drive), or a physical change (like building a sewage system).
The key difference from personal healthcare: public health interventions focus on prevention and population-level impact, not on curing an individual after they fall ill.
Why does it matter?
Think of a river. If everyone upstream throws garbage into it, no amount of medicine downstream will keep the villagers healthy. A public health intervention would be to build a proper waste disposal system upstream — stopping the problem at its source. This is far more efficient and equitable than treating each case of diarrhoea separately.
In the Indian context, the NCERT textbook highlights that poor public health infrastructure — lack of clean water, inadequate sanitation, low immunisation coverage — keeps millions trapped in a cycle of illness and poverty. Interventions like the National Health Mission, Swachh Bharat Abhiyan, and universal immunisation programmes are direct attempts to break that cycle.
Types of public health interventions (with everyday examples)
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Vaccination campaigns — You get a polio drop as a child. That single drop is an intervention that has nearly eradicated polio from India. It protects not just you, but also those around you (herd immunity).
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Sanitation and clean water projects — Building toilets, treating drinking water, and ensuring garbage collection. These prevent diseases like cholera, typhoid, and hepatitis A.
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Health education and awareness — Posters about handwashing, ads about the dangers of smoking, school lessons on nutrition. These change behaviour before disease sets in.
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Screening and early detection — Free camps to check blood pressure, diabetes, or cancer. Catching a disease early costs less and saves more lives than treating it late.
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Regulation and policy — Banning trans fats in food, mandating seatbelts in cars, setting limits on air pollution. These create a healthier environment without requiring individual effort.
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Nutrition programmes — Mid-day meals in schools, distribution of iron-folic acid tablets to pregnant women. These address underlying malnutrition that makes people vulnerable to disease.
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Part (b)Concept understanding — Health Effects
Health Effects — A First Look
Think about the last time you drank water from a roadside stall during summer. Your mind probably weighed two things: the immediate thirst, and the vague worry about whether the water was clean. That worry — that something in the environment might harm your body — is exactly what "health effects" means.
In simple terms, health effects are the changes — good or bad — that happen to your body and mind when you are exposed to something in your surroundings. That "something" could be polluted air, contaminated food, loud noise, stress at work, or even a new medicine. The key idea is that your environment and your health are not separate; they are constantly interacting.
The precise meaning
The NCERT textbook (Class 12, Business Studies, Chapter 12 — Consumer Protection) introduces health effects in the context of consumer awareness. When you buy a product or use a service, you have a right to know whether it will harm you. Health effects, therefore, refer to the physical or mental consequences that arise from using a product, consuming a food item, or living in a particular environment.
These effects can be:
- Immediate — like a headache from a chemical smell, or food poisoning from stale food.
- Long-term — like lung disease from years of breathing polluted air, or hearing loss from constant loud music.
- Direct — like a burn from a faulty appliance.
- Indirect — like stress and anxiety caused by unsafe living conditions.
Health effects are not just about illness. They also include positive effects — for example, the health benefit of drinking clean water or using a well-designed ergonomic chair. The term is neutral; it simply describes the outcome of an exposure.
Why it matters for a commerce/humanities student
You might think health effects belong only in biology or medicine. But in commerce and humanities, they are central to consumer protection, business ethics, and public policy.
Consider a company that sells packaged food. If the food contains a harmful preservative, the health effect on consumers could be serious — and the company faces legal action, loss of reputation, and financial penalties. That is why the Consumer Protection Act, 2019, gives you the right to safety — meaning products must not cause harm under normal use.
Similarly, in economics, health effects are part of externalities. A factory that pollutes a river creates a negative health effect for people downstream — but the factory does not pay for that harm. Understanding health effects helps you see why governments regulate industries and why consumers need protection.
A few key points to remember
- Health effects can be physical (like a rash, cough, or injury) or mental (like anxiety, depression, or stress).
- They can arise from products (food, medicines, electronics), services (healthcare, transport), or environmental factors (air, water, noise). …
Part (a)
- A vaccine introduces antigens that are recognised as foreign. B-lymphocytes are activated and differentiate into plasma cells that secrete specific antibodies (primary immune response), so antibody concentration rises.
- The first dose also produces memory B and T cells. On infection by the same pathogen these memory cells are activated at once and rapidly form plasma cells, giving a fast, high secondary response. …
Part (a): A vaccine causes a primary immune response (antibody production by plasma cells); a later infection triggers a rapid secondary response because of memory cells - P = Yes, Q = Getting the infection, R = No, S = Yes, T = No. Part (b): 'Smack' is heroin (diacetylmorphine) from Papaver somniferum, abused because it is an addictive depressant; Marijuana (Cannabis sativa), Cocaine (Erythroxylum coca) and Morphine (Papaver somniferum) each have characteristic effects.
Part (a)
- Why a vaccine raises antibody concentration. A vaccine contains antigens - weakened/inactivated pathogens or their antigenic parts. The immune system treats them as foreign: B-lymphocytes are activated and differentiate into plasma cells, which secrete large amounts of specific antibodies. This is the primary immune response and is seen as the first rise in antibody level.
- Why re-infection gives a very fast rise. During the primary response the body also makes long-lived memory B and T cells. When the same pathogen infects the child months later, these memory cells recognise it immediately and rapidly proliferate into plasma cells. The result is a secondary immune response that is quicker, stronger and reaches a higher antibody level than the first.
- Identifying the table.
| Type of immunity | Antibodies | Memory cells | Mode attained |
|---|---|---|---|
| Natural, active | Yes | P = Yes | Q = By getting the infection (natural exposure) |
| Natural, passive | No | R = No | Across placenta / breast feeding |
| Acquired, active | S = Yes | Yes | Getting a vaccine |
Showing the 12 most recent of 22 on this concept.
- AP EAPCET 2026Set ap-2026-05-19-FN1 markMCQQ.Assertion (A): Cocaine causes euphoria in man. Reason (R): It is involved in the transport of dopamine. (A) Both (A) and (R) are true. (R) is correct explanation for (A) (B) Both (A) and (R) are true. (R) is not correct explanation for (A) (C) (A) is true. But (R) is false (D) (A) is false. But (R) is true
›Reveal solutionSolution
Cocaine, extracted from the coca plant, blocks normal dopamine transport/reuptake at synapses, so dopamine lingers and keeps stimulating its receptors — this prolonged dopaminergic signalling is what produces the euphoric effect.
Concept and Intuition
Cocaine is a stimulant drug extracted from the coca plant (Erythroxylum coca). At the synapse, it interferes with the transporter proteins responsible for clearing the neurotransmitter dopamine out of the synaptic cleft after signalling. With dopamine reuptake blocked, dopamine accumulates and keeps activating its post-synaptic receptors far longer than normal, producing the drug's characteristic intense feeling of euphoria and reward.
Step-by-Step Solution
- Assertion: cocaine causes euphoria in humans — well-established pharmacological fact. True. …
- AP EAPCET 2026Set ap-2026-05-19-FN1 markMCQQ.Pick up the pollutant that cause head ache and blurred vision at lower concentration and at higher concentration, death may result. (A) Sulphur dioxide (B) Carbon dioxide (C) Carbon monoxide (D) Nitrogen oxide
›Reveal solutionSolution
Carbon monoxide poisoning progressively causes headache and blurred vision (mild hypoxia) at lower concentrations and death (severe hypoxia) at higher concentrations, because CO outcompetes oxygen for haemoglobin binding.
Concept and Intuition
Carbon monoxide (CO) is a colourless, odourless pollutant produced by incomplete combustion (vehicle exhaust, etc.). It binds to haemoglobin with a much higher affinity than oxygen, forming carboxyhaemoglobin and effectively blocking oxygen transport to tissues. At lower ambient concentrations/exposures, this produces symptoms of mild-to-moderate hypoxia such as headache, dizziness, and blurred vision; at higher concentrations, severe hypoxia can cause unconsciousness and death. This differentiates it from SO2 and NOx (which are more classically respiratory irritants) and CO2 (an asphyxiant mainly at very high concentrations by displacing oxygen, without the haemoglobin-binding mechanism).
Step-by-Step Solution
- Identify the pollutant described by "headache and blurred vision at low concentration, death at high concentration": this is the classic clinical picture of carbon monoxide poisoning. …
- AP EAPCET 2026Set ap-2026-05-20-FN1 markMCQQ.Diacetylmorphine is also called (A) Crack (B) Smack (C) Amphetamine (D) Barbiturate
›Reveal solutionSolution
Diacetylmorphine is the pharmacological name for heroin, commonly known on the street as "smack."
Concept and Intuition
Drug/alcohol abuse topics in biology often test recognition of a chemical name alongside its common street name. Heroin is chemically diacetylmorphine (an acetylated derivative of morphine, itself extracted from the opium poppy), and its slang name is "smack."
Step-by-Step Solution
- Recognise "diacetylmorphine" as the diacetyl ester of morphine — this compound is heroin.
- Match heroin to its common street name among the options: "smack" is the standard street term for heroin. …
- AP EAPCET 2025Set ap-2025-05-19-AN1 markMCQQ.Match the following List-I - List-II A) Morphine I) Cardio vascular system B) Cannabinoids II) Tranquilizers C) Cocaine III) Sleeping pills D) Benzodiazepines IV) Pain killer V) Dopamine (A) A-IV, B-I, C-V, D-II (B) A-III, B-II, C-I, D-IV (C) A-IV, B-III, C-V, D-II (D) A-II, B-V, C-I, D-IV
›Reveal solutionSolution
Matching commonly abused drugs to their primary physiological/pharmacological effect: Morphine–pain killer, Cannabinoids–cardiovascular system, Cocaine–dopamine, Benzodiazepines–tranquilizers.
Concept and Intuition
Different drugs of abuse act through different receptor systems: opioids like morphine bind opioid receptors in the CNS and gut, giving strong analgesia (pain relief); cannabinoids bind cannabinoid receptors in the brain and also affect the cardiovascular system; cocaine blocks the dopamine transporter at the nucleus accumbens, causing a flood of dopamine signalling (euphoria); and benzodiazepines are depressant drugs used clinically as tranquilizers/anti-anxiety agents.
Step-by-Step Solution
- Morphine → powerful analgesic → pain killer (IV).
- Cannabinoids → besides CNS receptors, they affect the cardiovascular system (I).
- Cocaine → blocks the dopamine transporter, interfering with dopamine (V) signalling. …
- AP EAPCET 2025Set ap-2025-05-19-AN1 markMCQQ.Excessive consumption of this drug causes hallucinations. (A) Cocaine (B) Morphine (C) Heroin (D) Charas
›Reveal solutionSolution
Excessive cocaine use is specifically associated with hallucinations because it massively disrupts dopaminergic signalling in the brain. Answer: (A) Cocaine.
Concept and Intuition
Drugs of abuse act on different neurotransmitter systems and therefore cause different characteristic effects:
- Cocaine blocks the dopamine transporter, causing dopamine to accumulate at synapses — producing intense euphoria/stimulation, and at excessive doses, hallucinations and paranoia.
- Morphine and heroin are opioids that bind opioid receptors, mainly causing analgesia, sedation and euphoria (CNS depression), not hallucinations as their hallmark.
- Charas is a cannabinoid (from Cannabis) that mainly affects the cardiovascular system and produces relaxation/euphoria.
Step-by-Step Solution
- Identify the pharmacological class of each option: cocaine = stimulant; morphine/heroin = opioids; charas = cannabinoid.
- Recall the signature toxic effect of each class as given in the standard biology curriculum: cocaine's excessive use is explicitly linked with hallucinations (sensory distortion) due to dopamine system overload. …
- AP EAPCET 2025Set ap-2025-05-20-FN1 markMCQQ.Match the following Substances - Functions A) Barbiturates - I. Cause sleeplessness B) Amphetamines - II. Cardio vascular system C) Benzodiazepines - III. Sedatives D) Cannabinoids - IV. Tranquilizers
- V. Cause sterelity (A) A-III, B-IV, C-V, D-II (B) A-III, B-I, C-IV, D-II (C) A-II, B-III, C-I, D-IV (D) A-V, B-II, C-III, D-IV
›Reveal solutionSolution
Barbiturates (sedatives), amphetamines (cause sleeplessness/stimulate CNS), benzodiazepines (tranquilizers), and cannabinoids (affect the cardiovascular system) match to III, I, IV, II respectively.
Concept and Intuition
This tests knowledge of the pharmacological class/effect of commonly abused/therapeutic drug categories covered in the "Human Health and Disease" chapter on drug/alcohol abuse:
- Barbiturates: depress the CNS, used clinically as sedatives/hypnotics.
- Amphetamines: CNS stimulants; increase alertness, suppress appetite and sleep — causing sleeplessness/insomnia with excess/abuse.
- Benzodiazepines: anti-anxiety agents, often called minor tranquilizers.
- Cannabinoids (from Cannabis sativa — marijuana, hashish): affect the cardiovascular system among other systemic effects.
Step-by-Step Solution
- A) Barbiturates → III (Sedatives): barbiturates are textbook sedative-hypnotic drugs.
- B) Amphetamines → I (Cause sleeplessness): being stimulants, they interfere with normal sleep, causing sleeplessness/insomnia.
- C) Benzodiazepines → IV (Tranquilizers): they are the classic minor tranquilizer/anti-anxiety drug class. …
- AP EAPCET 2024Set ap-2024-05-16-FN1 markMCQQ.In these days, some sports people misuse these drugs (A) Opioids (B) Cannabinoids (C) Coca alkaloids (D) Smack
›Reveal solutionSolution
Among opioids, cannabinoids, coca alkaloids and smack, cannabinoids are the class specifically flagged in the standard biology syllabus as being misused by sports persons.
Concept and Intuition
Different classes of abused drugs interact with different receptor systems: opioids act on opioid receptors (pain relief/sedation), cannabinoids act on cannabinoid receptors mainly in the brain and also affect the cardiovascular system, and cocaine (a coca alkaloid) is a CNS stimulant that blocks dopamine reuptake. The syllabus text singles out cannabinoids as a drug class abused by sports persons.
Step-by-Step Solution
- Opioids (morphine, heroin/smack) are primarily misused for their sedative/analgesic, euphoria-inducing effect, not specifically flagged for sports misuse in the syllabus.
- Cannabinoids are explicitly called out in the standard textbook discussion as being misused by sports persons. …
- AP EAPCET 2024Set ap-2024-05-17-AN1 markMCQQ.Assertion (A): Heroin is the most potent and highly addictive drug. Reason (R): Heroin is obtained by acetylation of morphine (A) A and R are true, R is correct explanation to A (B) Both A and R are true, R is not correct explanation to A (C) A is true but R is false (D) Both A and R are false
›Reveal solutionSolution
Both statements about heroin are independently true, but the chemical fact (acetylation of morphine) is a manufacturing detail, not a direct explanation of heroin's extreme potency and addictiveness.
Concept and Intuition
Heroin (diacetylmorphine) is a semi-synthetic opioid derived from morphine through a specific chemical modification (acetylation). While this chemical origin is a true and important fact, the Assertion's claim about potency/addictiveness is a separate pharmacological/clinical observation that requires its own justification (e.g., differences in how the drug is absorbed and acts on the brain), not simply the fact of its chemical derivation.
Step-by-Step Solution
- Assess A: heroin is widely recognised as one of the most potent and highly addictive drugs of abuse — true.
- Assess R: heroin (diacetylmorphine) is indeed obtained by acetylating morphine at two hydroxyl groups — true, this is standard pharmacological/chemical knowledge. …
- AP EAPCET 2024Set ap-2024-05-17-FN1 markMCQQ.It interferes with the transport of the neurotransmitter, dopamine. (A) Morphine (B) Heroin (C) Hashish (D) Cocaine
›Reveal solutionSolution
This tests knowledge of drug mechanisms from the NCERT "drug abuse" section: cocaine specifically blocks dopamine transport/reuptake at the synapse.
Concept and Intuition
Dopamine is a neurotransmitter associated with reward and pleasure. Normally, after release into the synapse, dopamine is cleared by a reuptake transporter back into the presynaptic neuron, ending the signal. Cocaine binds to and blocks this dopamine transporter, so dopamine keeps accumulating in the synaptic cleft and continues stimulating postsynaptic receptors — producing the characteristic "high," euphoria, and increased energy associated with cocaine use.
Step-by-Step Solution
- Recall each drug's primary mechanism: Morphine and Heroin → agonists at opioid receptors (mimic endogenous endorphins), producing analgesia/depressant effects.
- Hashish (a cannabinoid) → acts on cannabinoid receptors in the brain, affecting mood/cardiovascular system. …
- AP EAPCET 2024Set ap-2024-05-17-FN1 markMCQQ.Match the following
Drug Effect A Morphine I Depressant and slowdown body functions B Heroin II Produces a sense of euphoria and increased energy C Cannabinoids III Sedative and pain killer D Cocaine IV Effects on cardiovascular system (A) A – II, B – I, C – IV, D – III (B) A – III, B – I, C – IV, D – II (C) A – III, B – IV, C – I, D – II (D) A – II, B – IV, C – III, D – I ›Reveal solutionSolution
This is a direct recall match of drug names to their physiological effects, as given in the NCERT drug-abuse account.
Concept and Intuition
Each commonly abused drug produces a distinct hallmark physiological effect, which is how these questions are typically tested:
- Morphine — used medicinally as a sedative and pain-killer.
- Heroin — a depressant that slows down body function (breathing, heart rate).
- Cannabinoids (e.g. marijuana, hashish, charas) — affect the cardiovascular system of the body.
- Cocaine — interferes with dopamine transport, producing euphoria and a burst of increased energy.
Step-by-Step Solution
- Morphine → sedative/pain killer → matches III.
- Heroin → depressant, slows body functions → matches I.
- Cannabinoids → cardiovascular effects → matches IV.
- Cocaine → euphoria and increased energy → matches II.
- Combined mapping: A–III, B–I, C–IV, D–II, which is option (B). …
- AP EAPCET 2023Set ap-2023-05-22-FN1 markMCQQ.Identify the correct option Statement – I : Excessive dosage of cocaine causes hallucinations Statement – II: Intake of cocaine does not cause euphoria (A) Statement I is correct and II is wrong. (B) Statement I is wrong and II is correct. (C) Statements I and II are wrong. (D) Statements I and II are correct.
›Reveal solutionSolution
Cocaine causes strong euphoria (contradicting Statement II) and, at excessive doses, can cause hallucinations (supporting Statement I).
Concept and Intuition
Cocaine is a CNS stimulant that blocks the dopamine transporter, causing dopamine to accumulate in synapses and producing an intense sense of euphoria and increased alertness — this euphoric effect is precisely why cocaine is highly addictive. At high/excessive doses, its stimulant action can overshoot into toxic effects including agitation, paranoia, and hallucinations.
Step-by-Step Solution
- Evaluate Statement I: excessive cocaine causing hallucinations — consistent with known cocaine toxicity/overdose effects. TRUE. …
- AP EAPCET 2023Set ap-2023-05-23-AN1 markMCQQ.Match the following : Column I | Column II | Column III A. Opioids | M. Opium poppy | I. Receptors are present in CNS and GI tract. B. Cannabinoids | N. Cannabis sativa | II. Abused by sports persons C. Cocaine | O. South American Plant | III. Crack D. Heroin | P. Diacetyl morphine | IV. Smack (A) A – M – I, B – N – II, C – O – III, D – P – IV (B) A – P – IV, B – O – III, C – N – II, D – M – I (C) A – N – II, B – O – III, C – P – IV, D – M – I (D) A – O – III, B – P – IV, C – M – I, D – N – II
›Reveal solutionSolution
This three-column match links each drug class to its plant source and a defining fact: opioids/opium poppy/CNS+GI receptors, cannabinoids/cannabis/abused by sportspersons, cocaine/South American plant/street name crack, heroin/diacetylmorphine/street name smack — giving A-M-I, B-N-II, C-O-III, D-P-IV.
Concept and Intuition
Each of these commonly abused drugs has a distinct botanical or chemical origin and a characteristic fact associated with it, as covered in drug-abuse biology. Opioids are derived from the opium poppy (Papaver somniferum) and act by binding opioid receptors that are present not just in the central nervous system but also in the gastrointestinal tract (which is why opioid use classically causes constipation). Cannabinoids are derived from Cannabis sativa, and their receptors are concentrated in brain regions linked to pleasure/cognition; cannabinoids are specifically known to be abused by sports persons (historically used to relieve pain or for other performance-related reasons). Cocaine is extracted from the coca plant native to South America, and its purified, smokable free-base form is called 'crack'. Heroin is chemically diacetylmorphine, obtained by acetylation of morphine, and its common street name is 'smack'.
Step-by-Step Solution
- Match A (Opioids) to M (Opium poppy) as their plant source, and to I (receptors in CNS and GI tract) as their site of action. …
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