Life On Earth Flashcards
What happens in energy transfers
How much energy is used for growth ?
The majority is lost as best , movement and undigested materials
Only a small quantity used for growth
What do fertilisers provide
Nitrates
What do nitrates do
Increase crop yield
What happens when nitrates are dissolved in soil water
Absorbed into plants
What are nitrates used for to produce
Used to produce amino acids which are synthesised into plant proteins
Why do animals consume plants or other animals (hint- ……synthesis)
To obtain amino acids for protein synthesis
Fertilisers do what when they go into fresh water
Add extra unwanted nitrates
Cause algal blooms - increase algal population
What do algal blooms do
Reduce light levels. Killing aquatic plants
What do the dead plants become food for
Bacteria which means the population will increase
What does he bacteria use up a lot of and what does it do for other organisms
Oxygen and this reduces availability for other organisms
What is the build up of toxic substances called
Bioaccumulation
What is a mutations
A random change to genetic material
How do mutations appear and what are they a new source of
Spontaneous and source of new alleles
What can new alleles have an affect on
Animals becoming better adapted to their environment
Variation within a populations makes it possible for what
To evolve over time in response to changing environmental conditions
