B15 Flashcards
What is a habitat?
The place where an organism lives
What is a population?
All the organisms of one species living in a habitat
What is a community?
Populations of different species living in a habitat
What are abiotic factors?
Non living factors of the environment e.g temeprature
What are biotic factors?
Living factors of the environment e.g food
What is an ecosystem?
Interaction of a community of living organisms with non living parts of the environment
What do organims need from their enviironment and from other organisms in order to survive?
1) plants need light and space, as well as water and mineral ions from the soil
2) animals meed space , food ,water and mates
What do organism compete over?
Resources
In a community what do each species depend on?
Ofher species for things such as food , shelter , pollination and seed dispersal, this is called interdependence
How does interdependence effect the ecosystem?
If there is a major change in the ecosystem (such as a species being removed) it can have far reaching effects
What is a stable community?
One where all the species and environment factors are in balance so that population sizes remain fairly constant.
Examples of abiotic factors?
- moisture level
- light intensity
- temperature
- carbon dioxide level(for plants)
- wind intensity and direction
- oxygen levels (animals)
- soil ph and mineral content
Examples of biotic factors?
1) new predators arrving
2) competition-one species may outcompete another so that numbers are too low to breed
3) new pathogens
4) availability of food
What do both abiotic and biotic factors effect ?
The size of the populations in the communities
What is adaption?
Changing. Features or characteristics to live in a particular environment
