Topic: Error Analysis — Top 15 NEET Mistakes in BIO-02

Error 1: Saying Lactobacillus produces Swiss cheese holes. Correction: Lactobacillus produces CURD only. Swiss cheese holes = Propionibacterium shermanii ($CO_{2}$).

Error 2: Calling streptokinase an antibiotic. Correction: Streptokinase is a THROMBOLYTIC ENZYME from Streptococcus. It dissolves clots. No antibacterial activity.

Error 3: Saying streptomycin comes from Streptococcus. Correction: Streptomycin comes from STREPTOMYCES GRISEUS (a soil bacterium). Streptococcus produces streptokinase.

Error 4: Saying mycorrhiza fixes nitrogen. Correction: Mycorrhiza (Glomus) enhances PHOSPHORUS uptake — it does NOT fix nitrogen.

Error 5: Saying Azotobacter is symbiotic like Rhizobium. Correction: Azotobacter is FREE-LIVING in soil. Rhizobium is SYMBIOTIC in legume nodules.

Error 6: Saying primary sewage treatment significantly reduces BOD. Correction: Primary treatment (physical) has MINIMAL BOD effect. SECONDARY treatment (biological) dramatically reduces BOD.

Error 7: Saying cyanobacteria produce biogas. Correction: Cyanobacteria are BIOFERTILIZERS (fix $N_{2}$). METHANOGENS produce biogas. These are completely different organisms.

Error 8: Saying cyclosporin A comes from Streptomyces. Correction: Cyclosporin A is from TRICHODERMA POLYSPORUM (a fungus). Streptomyces produces antibiotics like streptomycin.

Error 9: Saying penicillin was industrially produced from Penicillium notatum. Correction: Fleming discovered it from P. notatum, but industrial production uses PENICILLIUM CHRYSOGENUM (higher yield).

Error 10: Saying BOD high = clean water. Correction: HIGH BOD = MORE POLLUTION. More organic matter = microbes need more oxygen = higher BOD.

Error 11: Saying Rhizobium works on wheat crops. Correction: Rhizobium requires LEGUME HOST PLANTS. Wheat is a non-legume — use Azotobacter/Azospirillum instead.

Error 12: Saying Anabaena forms root nodules. Correction: Anabaena is a FREE-LIVING CYANOBACTERIUM. Root nodules are formed by Rhizobium in legumes.

Error 13: Saying Bt toxin harms mammals. Correction: Bt Cry proteins are SAFE for mammals — acidic stomach pH denatures them, and mammals lack the specific midgut receptors.

Error 14: Saying lovastatin is an antibiotic. Correction: Lovastatin is a BIOACTIVE MOLECULE (statin) that inhibits HMG-CoA reductase. It is NOT an antibiotic.

Error 15: Saying secondary treatment converts sludge to biogas. Correction: Biogas is produced in ANAEROBIC DIGESTERS (separate step). Secondary treatment uses aerobic microbes to reduce BOD.