Ecosystem Flashcards
Why are there usually not more than five stages in a food chain?
- Not all of the energy taken in by one animal is passed on to the next.
- Some of the energy is wasted
- Only about 10% of energy is transferred from one level to the next
- insufficient
Two main ways animals lose energy in food chain
- Respiration
2. Movement
If there is a disease in the food web
Lions
The number of lions will decrease because
- losing food
- less things to eat
- The organisms that feed on were gone
Describe how to use a quadrat.
- Divide both areas in two groups
- By using a quadrate
- Set some random coordinates to avoid bias
- Count the quadrate
- Compare the two sides
A balanced community of organisms and the habitat in which they live.
Ecosystem
The concentration of insecticide changes from organism to organisms
Bioaccumlation
-Microsopic plants and animals will absorb
-The fishes eats microsopic
-Birds eats fishes
It doesn’t get broken down and come out with a serious amount
The insecticide may originally have entered the lake
DDT
Spray to kill insect
Spray on crops and then got washed out
_____________ is made by plants from the nitrates they absorb from the soil
Proteins
Excretory product containing nitrogen which is produced by animals
Urea
Rain forests have been cut down
- Paper production
- Development of housing
- Farming
The amount of rain falling on the forest area decreases after the trees have been cut down
- Lees transpiration
- Therefore more water vapour in the air
The effects that removing the trees has on the animal life
- Lose the habitat
- Lose food
Crops fail after a few years
The minerals in the soil was leached out and
the soil become inferilted. Therefore soil are more exposed to erosion. And there will be less rain and unable to grow.
Soil erosion
Eutraphication in river by fertilise
- Nitrates and gossil fate was poured into the river by human activity e.g. DDT
- Taken up by algae
- The algae increase in number
- Which cover the surface of the river and block the sunlight
- This decrease the rate of photosynthesis, therefore plants from the bottom died
- Increase the amount of decomposer and it break down more neutrients
- Causing less oxygen in river
- Fish dies
Effects of deforestation
- Soil is no longer anchored down
- Fertile top soil is washed away
- Without the canopy leaching occurs and soluble nutrients in the soil are washed away out of the soil
- Land becomes infertile, nothing grows
- Burning the cut trees adds more carbon dioxide to the air - increasing the greenhouse effect
- Less transpiration reduces rainfall leading to drought
- Less tress means less photosynthesis and more carbon dioxide in the air, adding to the greenhouse effect
- Loss of habitats has caused some organisms extinction, others and endangered.
- In the short term the increase in dead material results in more decomposers respiring, so releasing more carbon dioxide into the air.
