How do you extract information about a community from a chart, graph or table?
Identify what the labels, axes, scales or headings represent, including units, then read the relevant values.
AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation · 4.7.1.3
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How do you extract information about a community from a chart, graph or table?
Identify what the labels, axes, scales or headings represent, including units, then read the relevant values.
How do you interpret community interaction data?
Compare values or patterns and relate them to a possible interaction between organisms. The conclusion must be supported by the data.
Does an association between changes in two populations establish that one caused the other?
No. An association alone does not establish causation.
What four factors can affect the rate of population growth?
Food supply, competition, predation and disease.
How can food availability affect population growth?
It can support or limit organisms’ survival and reproduction.
How can competition for limited resources affect population growth?
It can reduce population growth.
How can predation and disease affect population growth?
They can increase deaths, slowing growth or causing population decline.
When does competition occur between organisms?
When they need the same resource and its supply is limited.
Can competition occur between organisms of the same species, different species, or both?
Both: competition can occur within a species or between different species.
What does competition affect for organisms in a community?
Their access to resources needed for survival and reproduction.
What four resources do plants often compete for?
Light, space, water and mineral ions from the soil.
What three things do animals often compete for?
Food, mates and territory.
Does competition for mates occur within a species or between different species?
Within a species.
What can be used to suggest which resources organisms compete for in a habitat?
The organisms present and the resources available.
How can competition for a limited resource cause a species' population to decline?
The less successful species may have lower survival and reproduction.
Why might a very small population of a sexually reproducing species produce few or no offspring?
Individuals may have difficulty finding mates.
When can a small population decline further and eventually disappear from its local community?
When too few offspring are produced to replace individuals that die.