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N5- Unit 3
KA 1- Biodiversity and the distribution of life
1- Species
Group of organisms which can interbreed and produce fertile
offspring.
2- Habitat
The place where an animal or a plant lives.
3- Population
4- Community
5- Ecosystem
6-What is meant by
biodiversity?
7-What can decrease
or increase
biodiversity?
8- Biotic factors
9-Describe how
grazing pressure
affects biodiversity.
10- Abiotic factors
11-Describe how pH
can affect
biodiversity in lochs?
12-Describe how
temperature affects
biodiversity in lochs?
Total number of organisms of the same species living in the
same area.
All the populations from different species living in the same
area.
All the organisms (i.e. the community) living in a particular
habitat and the non-living components with which the
organisms interact (i.e. abiotic factors)
The total variety of organisms living on Earth.
- biotic factors
- abiotic factors
- human activities (pollution air/water, habitat destruction.
deforestation, overfishing, overhunting.
Living influences on an ecosystem:
- Competition for resources
- food availability
- Number of predators
- Disease
- grazing
Low grazing pressure: Vigorous plants become dominant: low
biodiversity
Medium gazing pressure: greater biodiversity as the vigorous
plants are kept under control which give opportunity for
others to grow
High grazing pressure: low biodiversity as no plants have the
opportunity to grow.
Non-living influence on an ecosystem:
- air/water/soil temperature
- soil/water pH
- air/soil moisture
- light intensity
Only few species can tolerate a wide range in pHs. Many
species will not survive if water pH changes slightly.
Therefore changes in pH can result into reduced biodiversity.
Warmer waters contain less dissolved oxygen. Many fish
cannot tolerate a drop in oxygen levels. Therefore, water
temperature and influence on oxygen concentration has an
effect on biodiversity.
13-What is the name
given to all the plants
in an ecosystem?
14-What is the name
given to all the
animals in an
ecosystem?
15-Biome
16- What 2 abiotic
factors are affecting
the global
distribution of
biomes?
17-2 examples of land
based biomes
18- 2 examples of
water based biomes
19-Niche
Flora.
Fauna.
Various regions of our planet as distinguished by their
climate (i.e. temperature and rainfall), flora & fauna.
Tundra-Desert-Forest-Grassland
Freshwater lakes and rivers – marine biomes including coral
reefs
The role that an organism plays within a community. This
includes the use it makes of resources in its ecosystem,
including light, temperature and nutrients availability and
its interactions with other organisms in the community
including competition, parasitism and predation.