Combined Biology - B7 Ecology Flashcards
What is an ecosystem?
The interaction of a community of living organisms (biotic) with the non-living (abiotic) parts of the environment
What four things do plants compete for?
- Light
- Space
- Water
- Mineral ions
What is a community?
A group of animals and/or plants of different species
What are extremophiles? Give examples of conditions they might live in.
Organisms which live in extreme environments
e.g. high temperature, pressure or salt concentration
What is a population?
A group of animals or plants of the same species
What three things do animals compete for?
- Food
- Mates
- Territory/space
List three biotic factors which can affect a community.
Any three from:
- Availability of food
- New predators arriving
- New pathogens
- One species outcompeting another (so numbers are no longer sufficient to breed)
List three abiotic factors which can affect a community.
Any three from:
- Light intensity
- Temperature
- Moisture levels
- Soil pH and mineral content
- Wind intensity and direction
- CO2 levels for plants
- O2 levels of aquatic animals
Give two examples of producers
Plants and algae
What gases are contributing to global warming?
- Carbon dioxide
- Methane
- Water Vapour
Name three processes in the carbon cycle
Any three from:
- Photosynthesis
- Respiration
- Decay
- Burning/combustion
- Carbon locked up in fossil fuels
- Animals eating plants and other animals
What are the reasons for people doing deforestation?
- To provide land for cattle and rice fields
- Growing crops for biofuels
Give two examples of factors that reduce biodiversity.
- Deforestation
- Global warming
Give three things that are in place to reduce the negative impact on biodiversity?
Any three from:
- Breeding programmes for endangered species
- Protection / regeneration of rare habitats
- Reintroduction of field margins
- Reduction of deforestation and CO2 emissions
- Recycling resources
What are the four main stages in the water cycle?
- Evaporation
- Condensation
- Precipitation
- Transpiration
What is biodiversity?
The variety of all the different species of organisms on Earth.