YEAR 10 Ecosystems And Material Cycles Flashcards
(17 cards)
What are ABIOTIC factors
Non living
What is a trophic level
Stage in a pyramid of numbers or biomass
Parasitism vs mutualism
Parasitism only benefits the parasite
Mutualism benefits both organisms
What is interdependence
When two organisms depend on eachother
What is eutrophication
When a body of water becomes excessively enriched with nitrogen
Explain how eutrophication works
Fertiliser sprayed on fields.
Rain leaches fertiliser into waterways.
Nitrogen makes algae reproduce.
Stops sunlight reaching water plants.
Water plants die.
Not enough nitrates left-> algae dies too.
Bacteria breaks down dead matter, using up oxygen as they respire.
Low oxygen kills all other organisms.
Bacteria break the down and release nitrates.
Why do plants use nitrogen
To make amino acids and proteins for growth
Why is energy transfer between plants and herbivores inefficient
Cellulose in plants is very hard to digest
What does Tertiary mean
Thirdondary
What is food security
Access for everyone to enough safe and nutritious food at all times
What are some factors which affect the level of food security
Population
Pests or pathogens
Sustainability of farming methods
How does the carbon cycle work
Start with carbon being in the atmosphere
Im atmosphere
Into plants via photosynthesis
Into animals which respire
Carbon returns to atmosphere
What does Nitrogen fixing bacteria do
Use nitrogen to make nitrates
What does Nitrifying bacteria do
Convert ammonium into nitrates
OR
Convert nitrites into nitrates
What does Denitrifying bacteria do
Convert nitrates to nitrogen gas
What does Denitrifying bacteria do
Convert nitrates into nitrogen gas
How does reverse osmosis remove the solute in a solution
Pressure is exerted into the solution
Forcing water molecules through semi permeable membrane
Leaves solute particles behind
