Unit 9 – Human Population and Health Disorders Class 12 Biology Notes
9.1 Human Population: Growth problem and control strategies, Concept of demographic cycle. (2 teaching hours)
9.2 Health disorders: Concept of cardiovascular, respiratory & renal disorders; Substance abuse: Drug, alcohol and smoking abuse. (4 teaching hours)
9.2 Animal behavior: Reflex action, taxes, dominance and leadership. Fish and bird Migration. (4 teaching hours)
9.3 Environmental Pollution: Sources, effects and control measures of air, water and soil pollution. Pesticides & their effects. (3 teaching hours)