Organisms and Populations
CBSE · Class 12 · Biology
Summary of Organisms and Populations for CBSE Class 12 Biology. Key concepts, important points, and chapter overview.
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Ecology studies the relationships of living organisms with abiotic factors and with other species. Population ecology focuses on groups of individuals of the same species living in a defined area. A population has special attributes such as birth rate, death rate, sex ratio, age distribution and pop
Key Concepts
Ecology studies living organisms in relation
Ecology studies living organisms in relation to their physical environment and to other species. Its main levels of organisation are organisms, popula
A population is a group
A population is a group of individuals of the same species living in a defined geographical area and sharing or competing for resources. Even groups f
A population has birth rate
A population has birth rate, death rate, sex ratio and age distribution, while an individual organism does not. Age distribution is often shown using
Population density is the size
Population density is the size of a population, designated as N. It may be measured by number, biomass, per cent cover or relative density depending o
Birth rate is the number
Birth rate is the number of births per individual in a given time period, and death rate is the number of deaths per individual in a given time period
Learning Objectives
- Understand ecology at the levels of organisms, populations, communities and biomes.
- Define population and identify its special attributes.
- Explain population density and its different ways of measurement.
- Describe how natality, mortality, immigration and emigration change population size.
- Differentiate exponential growth from logistic growth.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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