Biology IGCSE T1

Population

All the organisms of one species living in a specific habitat.

Community:

All the populations of different species living and interacting in a habitat.

Ecosystem:

The interaction of a community of living organisms with the non-living parts of their environment.

Interdependence:

Within a community, each species depends on other species for food, shelter, pollination, and seed dispersal. If one species is removed, it can affect the whole community.

Name 6 Abiotic factors

Light intensity, temperature, pH, moisture levels, wind intensity, oxygen levels

Name 4 biotic factors

Availability for food, New predators arriving, New pathogens or diseases, One species outcompeting another

Quadrats

Used for stationary organisms

Transects

Used when there is a gradual change in an abiotic factor