SB9 - Ecosystems and Material cycles Flashcards
What do organisms need to stay alive?
Resources
What is an ecosystem?
An area in which all the living organisms and all the non-living physical factors form a stable relationship
–> Needs NO input in order to remain stable
Give an example of a large ecosystem:
Rainforest
Give an example of a small ecosystem:
Pond
What does interdependent mean?
When organisms in an area need each other for resources
E.g. Food & Shelter
What is Abiotic factors?
The non-living aspects of an ecosystem
Give some examples of Abiotic factors:
- Temperature
- Light intensity
- Moisture
- Pollutants
Explain how light intensity affects a community as an abiotic factor
- Light is required for photosynthesis
- Rate of photosynthesis affects the rate at which a plant grows
- Plants can be food sources or shelter for many organisms
Explain how Temperature affects a community as an abiotic factor
- Temperature affects the rate of photosynthesis
Explain how Moisture levels affects a community as an abiotic factor
- Both plants and animals need water to survive
Explain how Soil pH and mineral content affects a community as an abiotic factor
- Soil pH affects the rate of decay
—> Therefore how fast mineral ions return to soil
—> Then taken up by other plants - Different species of plants thrive in different nutrient concentration levels
Explain how Wind intensity & direction affects a community as an abiotic factor
- Wind affects the rate of transpiration in plants
- Transpiration affects the temperature of the plant + rate of
photosynthesis
—> As it transports water and mineral ions to the leaves
Explain how Carbon dioxide levels affects a community as an abiotic factor
- CO2 affects the rate of photosynthesis in plants
- It also affects the distribution of organisms as some thrive in high CO2 environments
Explain how Oxygen levels for aquatic animals affects a community as an abiotic factor
- Levels in water vary greatly, unlike oxygen levels in air
- Most fish need a high concentration of oxygen to survive
What is Biotic factors?
The living components of an ecosystem