ORGANISM AND POPULATION CLASS 11TH NEET BIOLOGY HANDWRITTEN NOYES

Here is a concise outline of the key topics covered in the chapter “Organisms and Populations” for Class 11 Biology, important for NEET preparation:

1. Introduction
   • Definition and scope of ecology
   • Levels of biological organization (organism, population, community, ecosystem, biome, biosphere)
2. Organism and Its Environment
   • Major abiotic factors (temperature, water, light, soil)
   • Responses to abiotic factors (conformers, regulators, migration, hibernation, aestivation)
3. Adaptations
   • Behavioral adaptations
   • Physiological adaptations
   • Morphological adaptations
4. Population Ecology
   • Definition and characteristics of a population
   • Population attributes (birth rate, death rate, sex ratio, age distribution)
   • Population density
5. Population Growth
   • Exponential growth (J-shaped curve)
   • Logistic growth (S-shaped curve)
   • Carrying capacity
   • Growth models
6. Life History Variations
   • r-selected species
   • K-selected species
7. Population Interactions
   • Types of interactions:
     • Mutualism
     • Competition
     • Predation
     • Parasitism
     • Commensalism
     • Amensalism
8. Examples of Population Interactions
   • Predator-prey relationships
   • Parasite-host relationships
   • Plant-pollinator interactions
9. Population Regulation
   • Density-dependent factors
   • Density-independent factors

These topics cover the essential aspects of organisms and populations, crucial for understanding ecological relationships and dynamics, and preparing for NEET Biology