Topic: PYQ Analysis — BIO-02 NEET Patterns (2015-2024)
High-Frequency Topics (Tested Yearly):
| Topic | Years Tested | Question Type | Common Trap |
|---|---|---|---|
| Streptokinase source and function | 2019, 2022 | Single correct | Source = Streptococcus; NOT antibiotic |
| Swiss cheese holes (Propionibacterium) | 2017, 2020 | Single correct | Students choose Lactobacillus |
| BOD and water quality | 2020, 2023 | Single correct | Students reverse the relationship |
| Mycorrhiza and phosphorus | 2016, 2021 | Single correct | Students say nitrogen, not phosphorus |
| Biofertilizer in paddy fields | 2018, 2021 | Single correct | Anabaena/Nostoc, not Rhizobium |
| Penicillin discovery | 2015, 2019 | Single correct | Fleming/1928/Penicillium notatum |
| Cyclosporin A source | 2022 | Single correct | Trichoderma polysporum (fungus) |
PYQ-Style Question Patterns:
Pattern 1 — Microbe-Product Swap: "Which is produced by Streptococcus?" → Always streptokinase (thrombolytic enzyme)
Pattern 2 — BOD Direction: "High BOD indicates ___" → More organic pollution / more polluted water (NEVER less pollution)
Pattern 3 — Biofertilizer Paddy: "Biofertilizer for paddy/rice fields" → Anabaena or Nostoc (cyanobacteria)
Pattern 4 — Mycorrhiza Nutrient: "Mycorrhiza primarily helps in absorption of ___" → Phosphorus (NEVER nitrogen)
Pattern 5 — Category Classification: "Streptokinase is classified as ___" → Enzyme (NOT antibiotic, NOT bioactive molecule)
Pattern 6 — Assertion-Reason: Often combined: "A says X is a free-living fixer; R says it requires legume host" → Test whether student knows Rhizobium is symbiotic (A = false when attributed to free-living organisms)
Marks Trend: 2-3 questions from this chapter per NEET exam (6-9 marks). High return on investment for preparation time.