Biology Diseases
Key Concepts & Formulas
Provide 5-7 essential concepts for Biology Diseases:
| # | Concept | Quick Explanation |
|---|---|---|
| 1 | Types of Diseases | Communicable (infectious) spread person-to-person; Non-communicable (lifestyle) like diabetes, cancer |
| 2 | Disease Transmission | Airborne (TB), Waterborne (cholera), Vector-borne (malaria-mosquito), Direct contact (AIDS) |
| 3 | Vaccination Principle | Introduces weakened/attenuated pathogens to build antibodies without causing disease |
| 4 | Immunity Types | Active (body produces antibodies), Passive (ready-made antibodies given); Natural vs Artificial |
| 5 | Common Vectors | Female Anopheles (malaria), Aedes (dengue), Housefly (cholera), Rat flea (plague) |
| 6 | Deficiency Diseases | Vitamin A (night blindness), B1 (beriberi), C (scurvy), D (rickets), Iron (anemia) |
| 7 | Waterborne Diseases | Cholera, Typhoid, Hepatitis A, Diarrhea - all spread through contaminated water/food |
10 Practice MCQs
Generate 10 MCQs with increasing difficulty (Q1-3: Easy, Q4-7: Medium, Q8-10: Hard)
Q1. Which disease is caused by vitamin C deficiency? A) Night blindness B) Scurvy C) Rickets D) Beriberi
Answer: B) Scurvy
Solution: Vitamin C is essential for collagen synthesis. Its deficiency causes scurvy, characterized by bleeding gums, loose teeth, and delayed wound healing.
Shortcut: C for Citrus fruits AND C for Scurvy
Concept: Biology Diseases - Vitamin deficiency diseases
Q2. Malaria is transmitted by which mosquito? A) Culex B) Aedes C) Anopheles D) Mansonia
Answer: C) Anopheles
Solution: Female Anopheles mosquito transmits Plasmodium parasite causing malaria. They bite mainly during dusk to dawn.
Shortcut: A for Anopheles AND A for All malaria cases
Concept: Biology Diseases - Vector-borne diseases
Q3. Which disease is NOT caused by bacteria? A) Tuberculosis B) Typhoid C) Rabies D) Cholera
Answer: C) Rabies
Solution: Rabies is caused by a virus (rhabdovirus), while TB (Mycobacterium), Typhoid (Salmonella), and Cholera (Vibrio) are bacterial diseases.
Shortcut: Virus diseases: Rabies, AIDS, COVID-19 (remember R-A-C)
Concept: Biology Diseases - Pathogen types
Q4. A train compartment has 80 passengers. If 15% are vaccinated against polio and 25% against tuberculosis, how many passengers are NOT vaccinated against either disease? A) 48 B) 52 C) 56 D) 60
Answer: A) 48
Solution: Vaccinated passengers = 15% + 25% = 40% of 80 = 0.40 × 80 = 32 passengers Not vaccinated = 80 - 32 = 48 passengers
Shortcut: Total unvaccinated = 60% of 80 = 48
Concept: Biology Diseases - Vaccination percentages
Q5. Which vitamin deficiency causes night blindness in railway signal workers? A) Vitamin A B) Vitamin B C) Vitamin C D) Vitamin D
Answer: A) Vitamin A
Solution: Vitamin A maintains healthy retina and is essential for vision in dim light. Its deficiency causes night blindness (nyctalopia), critical for signal workers.
Shortcut: A for “Aye-Aye Captain” (vision) AND Vitamin A
Concept: Biology Diseases - Vitamin deficiency in occupational health
Q6. The ORS (Oral Rehydration Solution) contains sodium, potassium, glucose and water in ratio 3:2:1:20. For 260ml total solution, how much glucose is needed? A) 10ml B) 12ml C) 15ml D) 20ml
Answer: B) 12ml
Solution: Total ratio parts = 3+2+1+20 = 26 parts Glucose = 1 part of 260ml = 260/26 = 12ml
Shortcut: Glucose = Total volume ÷ Total ratio parts × Glucose parts
Concept: Biology Diseases - ORS composition for diarrhea treatment
Q7. In a railway colony survey, disease incidence follows: Malaria (18%), Dengue (12%), Chikungunya (6%). If total population is 2500, how many people have vector-borne diseases? A) 600 B) 750 C) 900 D) 1050
Answer: C) 900
Solution: Total vector-borne % = 18 + 12 + 6 = 36% Number affected = 36% of 2500 = 0.36 × 2500 = 900 people
Shortcut: 36% = 0.36; 0.36 × 2500 = 900
Concept: Biology Diseases - Vector-borne disease epidemiology
Q8. A train food poisoning incident affects passengers. Epidemiological data shows: 72 affected out of 120 sampled. If train has 800 passengers total, estimate total affected using proportion. A) 480 B) 520 C) 560 D) 600
Answer: A) 480
Solution: Attack rate = 72/120 = 0.6 or 60% Estimated total affected = 60% of 800 = 0.6 × 800 = 480 passengers
Shortcut: (Affected sample ÷ Total sample) × Total population
Concept: Biology Diseases - Foodborne outbreak estimation
Q9. A railway hospital treats 150 TB patients monthly. If directly observed therapy (DOTS) has 85% success rate and 15% default rate, how many patients successfully complete treatment? A) 128 B) 135 C) 142 D) 150
Answer: A) 128
Solution: Successful completions = 85% of 150 = 0.85 × 150 = 127.5 ≈ 128 patients Defaults = 15% of 150 = 22.5 ≈ 23 patients
Shortcut: 85% × 150 = 128 (rounded to nearest whole patient)
Concept: Biology Diseases - TB treatment success rates
Q10. A dengue prevention program covers 3 railway stations. Station A (4500 people) has 8% infection rate, Station B (3200 people) has 12%, Station C (2800 people) has 5%. What's the overall infection rate for all three stations? A) 7.8% B) 8.5% C) 9.2% D) 10.1%
Answer: B) 8.5%
Solution: Total population = 4500 + 3200 + 2800 = 10,500 Total infected = (0.08×4500) + (0.12×3200) + (0.05×2800) = 360 + 384 + 140 = 884 Overall rate = (884/10500) × 100 = 8.42% ≈ 8.5%
Shortcut: Weighted average = Σ(population × rate) ÷ Σpopulation
Concept: Biology Diseases - Community disease burden calculation
5 Previous Year Questions
Generate PYQ-style questions with authentic exam references:
PYQ 1. Which of the following is a viral disease? [RRB NTPC 2021 CBT-1]
Answer: D) Dengue
Solution: Dengue is caused by dengue virus transmitted by Aedes mosquito. Others: Typhoid (bacteria), Malaria (protozoa), Ringworm (fungus)
Exam Tip: Remember VBD - Viral, Bacterial, Dengue (Virus)
PYQ 2. The full form of BCG vaccine is: [RRB Group D 2022]
Answer: A) Bacillus Calmette Guerin
Solution: BCG vaccine is given for tuberculosis prevention. Named after its developers Calmette and Guerin.
Exam Tip: BCG = Bacillus (bacteria) + Calmette + Guerin (scientists)
PYQ 3. Match the diseases with their causative organisms: [RRB ALP 2018]
Answer: C) A-3, B-1, C-4, D-2
Solution: Tuberculosis - Mycobacterium (bacteria), Ringworm - Fungus, Malaria - Plasmodium (protozoa), Rabies - Virus
Exam Tip: Create memory chain: T-B-F-M-P-R (Tuberculosis-Bacteria, Fungus-Ringworm, Malaria-Protozoa, Rabies-Virus)
PYQ 4. Which vitamin deficiency causes pernicious anemia? [RRB JE 2019]
Answer: C) Vitamin B12
Solution: Vitamin B12 is essential for RBC formation. Its deficiency causes pernicious anemia, where body can’t make enough healthy red blood cells.
Exam Tip: B12 = “B” for “Blood” cells
PYQ 5. The incubation period for cholera is typically: [RPF SI 2019]
Answer: B) 1-3 days
Solution: Cholera has short incubation period of 1-3 days, sometimes as short as few hours. This rapid onset makes it dangerous in outbreaks.
Exam Tip: Cholera = “Ch” for “Quick” onset (1-3 days)
Speed Tricks & Shortcuts
For Biology Diseases, provide exam-tested shortcuts:
| Situation | Shortcut | Example |
|---|---|---|
| Identifying viral vs bacterial | “Virus needs VEHICLE” (HIV, Rabies, Influenza, Dengue, Ebola) | Rabies = Virus, TB = Bacteria |
| Vitamin deficiency memory | “A-B-C-D” = “Eye-Beriberi-Scurvy-Rickets” | A=Eye problems, B=Beriberi, C=Scurvy, D=Rickets |
| Waterborne diseases | “CHOLERA TYPHOID” = Contaminated Water | Cholera, Typhoid, Hepatitis A = Water |
| Vector diseases | “MDC” = Mosquito Diseases Common | Malaria, Dengue, Chikungunya = Mosquito |
| Vaccination schedule | “BCG-OPV-DPT” = Birth-6wk-10wk | BCG at birth, OPV at 6 weeks, DPT at 10 weeks |
Common Mistakes to Avoid
| Mistake | Why Students Make It | Correct Approach |
|---|---|---|
| Confusing Anopheles vs Aedes | Both are mosquitoes | Anopheles = Malaria (A-M), Aedes = Dengue (A-D) |
| Mixing incubation periods | Similar diseases have different timelines | Cholera=1-3 days, Typhoid=7-14 days, TB=2-12 weeks |
| Vitamin vs mineral deficiency | Both cause deficiency diseases | Vitamins=A,B,C,D; Minerals=Iron, Iodine, Calcium |
| Active vs passive immunity | Confuse natural vs artificial | Active=body makes antibodies; Passive=antibodies given |
| Endemic vs epidemic vs pandemic | Similar prefixes | Endemic=always present, Epidemic=regional outbreak, Pandemic=global |
Quick Revision Flashcards
| Front (Question/Term) | Back (Answer) |
|---|---|
| Female Anopheles mosquito | Transmits malaria |
| ORS full form | Oral Rehydration Solution |
| Vitamin B1 deficiency | Beriberi |
| Rabies causative | Virus (rhabdovirus) |
| DOTS program | TB treatment strategy |
| AIDS transmission | Blood, semen, mother-to-child |
| Cholera causative | Vibrio cholerae bacteria |
| Dengue vector | Aedes mosquito |
| BCG vaccine | TB prevention |
| Scurvy prevention | Vitamin C (citrus fruits) |
Topic Connections
How Biology Diseases connects to other RRB exam topics:
- Direct Link: General Awareness - Current health schemes (Ayushman Bharat, Polio eradication)
- Combined Questions: Chemistry - pH values (stomach acid in ulcers), Physics - Ultrasound in medical diagnosis
- Foundation For: Advanced biology topics (genetics in inherited diseases, biotechnology in vaccine production)
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