Life on earth Flashcards
Definition of carnivore
Consumer which eats other animals
Defnititon of herbivore
Consumer which eats plants
Omnivore
Plants and animals
Producer
Make their own food via photosynthesis
Consumer
Eats other organisms
Population
Number of same species in a habitat
Biodiversity
Variety of different species which exist in a habitat.
Prey
Eaten by predators
Biotic factors
Competition for resources, disease, food availability, grazing and predation.
Abiotic factors
Light intensity , moisture , ph and temperature
Describe stage 1 photosynthesis
Light reactions ,
The light energy trapped by chlorophyll in chloroplasts and converted into chemical energy to generate ATP
Water is split to produce?
Hydrogen and oxygen
Word summary for photosynthesis
Co2+ H20 —> sugar + oxygen
Describe carbon fixation
A series of enyzme controlled reactions which use hydrogen and ATP with carbon dioxide to produce sugar.
What’s essential for light reactions?
Light 😜
What’s absorbs the light
Chlorophyll
3 limiting factors of photosynthesis
Light intensity , temperature, carbon dioxide
True or false
Pyramids of numbers show the NUMBER of organisms at each level of food chain
True
Pyramids of energy show
The energy produced by organsims
Increasing human population requires
Increase crop yeild
Fertilisers provide chemicals such as
Nitrates which increase crop yeild
True or false
Nitrates dissolve in soil
True
Describe events of algal bloom
- Fertilisers leach onto water.
- Reduces light levels, killing plants.
- These dead plants become food for bacteria.
- Bacteria increases which uses us oxygen , reducing oxygen for other organisms.
Give an example of natural fertiliser
Introducing a predator
What is bioaccumulation
The build up of toxic substances in living organisms
What is a mutation
Random change to genetic material.
What can increase rate of mutation
Radiation , chemicals.
Define speciation
The development of new species
