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Nat5 life on earth
Nat5 Ecosystems
| Question | Answer |
|---|---|
| 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
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