HL 1 Biology

5.1a Communities, Ecosystems


Habitat: the environment inwhich a species normally lives or the location of a living organism

Species: a group of organisms that can interbreed and produce fertile offspring

Population: a group of organisms of the same species who live in the same area at the same time

Community: a group of populations living and interacting with each other in an area

Ecosystem: a community and its abiotic environment

Ecology: the study of relationships between living organisms and between organisms and their environment

<Food Sources>

Autotroph: an organism that synthesizes its organic molecules from simple inorganic substances

Heterotroph: an organism that obtains organic molecules from other organisms

Consumer: an organism that ingests organic matter that is living or recently killed

Detritivore: an organism that ingests non-living organic matter

Saprotroph:  an organism that lives on or in non-living organic matter, secreting digestive enzymes into it and absorbing the products of digestion.


Unexpected diets (p. 176)

1)  The Venus fly trap, ghost orchid, and euglena are autotrophic.

2) The Dodder (some are photosynthetic); euglena, ghost orchid (some are photosynthetic) are heterotrophic.

3) Out of these heterotrophic organisms, the  dodder and euglena are consumer;and the  ghost orchid is the saprotroph.

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