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Nat5 life on earth

Nat5 Ecosystems

What is a habitat? It is where an organism lives.
What does community consist of? all the animals/plants living in one area
What is a population? All the members of one particular species
What is an ecosystem made up of? living (community) and non living (habitat) parts
What are biomes? Large ecosystems
How many biomes are there in the world? There are 9 biomes worldwide dependent on the climate (temperature and rainfall) e.g. Tundra, Sahara
What characterizes a particular biome? Its specific flora (plants), fauna (animals) and climate (rainfall and temperature).
Why should biomes be preserved? In order to have a stable planet as they increase the biodiversity
What is biodiversity? It is the variety and abundance of organisms present
What are biomes affected by? biotic, abiotic and human factors
Which factor has the biggest impact on biodiversity of a biome? human factor.
What are biotic factors? They are living factors and include predators and grazing
What are abiotic factors? They are non living factors and include moisture, light intensity pH and temperature
Predator and prey numbers are the opposite of each other and can be shown as waves on a graph.
Low grazing leads to low biodiversity as dominant plant species is not kept in check
Medium grazing leads to an increase in biodiversity as dominant plant species are eaten, allowing weaker species to grow.
High grazing leads to low biodiversity as only the dominant plant species can tolerate very high grazing.
Human impact factors are: exploitation (overfishing/hunting), deforestation, poaching and pollution
Pollution by burning fossil fuels increases the sulfur dioxide concentration in the air.
What is an indicator species? A species that indicates the level of pollution by its presence/absence.
An example of indicator species would be lichen. They only grow where there is little air pollution
What causes algal bloom? Fertiliser dissolving in rain water and being washed into lochs, which increases the nitrate concentration
What follows an algal bloom? Decomposer bacteria feed on the algae and reduce the oxygen levels in the water (respiration) causing fish to die.
Created by: dr.prorocic