The organism in the environment

4.1 Key Terms:

• Population: A group of individuals of the same species living in a specific area.

• Community: All the different populations living together in a particular area.

• Habitat: The place where an organism lives, providing food, shelter, and mates for reproduction.

• Ecosystem: A community of living organisms interacting with each other and their physical environment.

4.2 Practical Investigation:

• Method: Use quadrats to investigate the population size of an organism.

• Procedure:

  • Select two different areas for sampling.

  • Place a quadrat randomly in each area.

  • Count the number of individuals of the target organism within the quadrat.

  • Repeat in multiple quadrats to ensure accuracy.

4.3 Biodiversity:

• Definition: The variety of life in a particular habitat or ecosystem, including species diversity, genetic diversity, and ecosystem diversity.

4.4 Practical Investigation of Distribution and Biodiversity:

• Method: Measure biodiversity using quadrats to identify and count organisms in their habitats.

• Procedure:

  • Place quadrats in different habitats.

  • Record the types and numbers of organisms found.

  • Calculate biodiversity indices based on species counts and distribution.

4.5 Factors Affecting Organisms:

• Abiotic Factors: Non-living environmental factors that can affect population size and distribution, such as light, temperature, water, and soil pH.

• Biotic Factors: Living factors that affect population size and distribution, including competition, predation, and disease.