Natural Resources - Air, Water and Land
- Environment-natural surroundings and external conditions of an organism, which include all living and non-living factors that affect the organism
- Organism- is the basic unit of an ecological hierarchy, can be unicellular such as Amoeba and paramecium or multicellular such as humans
- Population- a group of individuals of the same species inhabiting a given geographical area at a particular time and functioning as a unit
- Community- includes all individuals of different species living within a certain geographical area
- Ecosystem- includes both living and non-living components of an area
- Biosphere- The sum total of all ecosystems and their interactions
Components of an ecosystem
- Abiotic factors- non living components like light, temperature, water, air etc.
- Biotic factors-living organisms
- Autotrophs or producers- organisms that can manufacture their own food from inorganic raw materials, also known as producers
- Heterotrophs-cannot synthesize their own food; dependent on other organisms for their food requirements.
- Herbivores or primary consumers - feed only on plants e.g., deer, horse, sheep etc.
- Carnivores or secondary consumers - eat other animals e.g., frog, cat, spider etc.
- Omnivores- feed on both plants and animals e.g. bear, …
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