B6 - microscopic life in water
- Created by: Naomi
- Created on: 21-01-13 15:15
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- Microscopic life in water
- Advantages of living in water
- Temperature of water does not change as much as the air temperature
- Dehydration is unlikely to happen
- Water supports their weight
- Organisms can grow much bigger
- Excreted waste is diluted in the water
- Organisms such as an amoeba have a contractile vacuole that can store any excess water
- The vacuole can then fuse with the cell membrane and empty the water to the outside
- Disadvantages of living in water
- In salt water too much water could be lost
- Too much water could get in and burst the cells
- In freshwater organisms can take up too much water by osmosis. In salt water, too much water may be lost to the surroundings by osmosis
- In salt water too much water could be lost
- In freshwater organisms can take up too much water by osmosis. In salt water, too much water may be lost to the surroundings by osmosis
- Difficult to swim against the current
- Advantages of living in water
- Temperature of water does not change as much as the air temperature
- Dehydration is unlikely to happen
- Water supports their weight
- Organisms can grow much bigger
- Excreted waste is diluted in the water
- Plankton
- Phytoplankton are plants and they photosynthesise
- Zooplankton are microscopic animals
- Baby fish are zooplankton
- The numbers of phytoplankton and zooplankton vary at different depths and in defferent seasons
- This is because phytoplankton needs light so it can photosynthesise
- Food webs in the ocean
- Most rely directly on green plants or phytoplankton
- Called a grazing food web
- Others deeper in the ocean feed on marine snow
- Marine snow is organic matter that falls from the surface, including dead and dying matter and faeces
- Some rely on bacteria, deep in the ocean, acting as producers
- Some bacteria can use hydrogen sulphide to make organic food, this means food webs can exist where there is no light
- Most rely directly on green plants or phytoplankton
- Water pollution
- Eutrophication
- Some species are more sensitive to pollution than others and so they can be used as bioligical indicators for pH and oxygen
- Advantages of living in water
- Disadvantages of living in water
- Too much water could get in and burst the cells
- In freshwater organisms can take up too much water by osmosis. In salt water, too much water may be lost to the surroundings by osmosis
- In freshwater organisms can take up too much water by osmosis. In salt water, too much water may be lost to the surroundings by osmosis
- Difficult to swim against the current
- Too much water could get in and burst the cells
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