Ecosystems (Grade 10 NSC Matric Life Sciences): Flashcards

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Ecosystems
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Ecosystem definition

Living organisms + environment they interact with

Autotrophs

Organisms that make their own food (producers)

Heterotrophs

Organisms that must eat others for food (consumers)

Special ability of decomposers

Digest materials outside their bodies

Neutral pH value

77

Humus

Decomposed organic matter in soil (gives dark colour)

Xerophytes

Plants adapted to dry habitats with low rainfall

Percentage of nitrogen in air

78%78\%

Energy lost at each trophic level

90%90\%

Biodegradable meaning

Can be broken down by decomposers

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