Organisms in the environment
- Created by: boy_repellent
- Created on: 10-04-14 15:27
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- Organisms in the environment
- Photosynthesis
- carried out by green plants and algae
- chlorophyll in the chloroplasts absorbs the Sun's light energy
- carbon dioxide + water - (+ light energy) - glucose + oxygen
- Co2 is taken in by leaves, H2o is taken in by roots, chlorophyll traps the light energy, this energy is used to convert Co2 and H2o into glucose
- oxygen is released as a by-product of photosynthesis
- some glucose is converted into insoluble starch for storage
- Co2 is taken in by leaves, H2o is taken in by roots, chlorophyll traps the light energy, this energy is used to convert Co2 and H2o into glucose
- by testing leaves with iodine solution we can identify starch and show the occurrence of photosynthesis
- variegated leaves have green patches (with chlorophyll) and white (w/o chlorophyll
- only green patches will turn the iodine blue-black to show starch
- carried out by green plants and algae
- Limiting factors
- lack of light and Co2 will slow down photosynthesis
- cold will stop enzymes working effectively- slowing down photosynthesis
- The independent variable- the one being teseted
- The dependent variable- the one you measure
- How plants use glucose:
- converted into soluble starch for storage
- used for respiration
- used to produce cellulose to strengthen cell wall
- used to produce protein
- mineral ions (nitrate ions) are needed to produce protein
- Controlling photosynthesis
- evaluate benefits of increasing growth with increased cost of heating/lighting and providing Co2
- growing plants in a Greenhouse/Poly-tunnels makes it easier to control environment conditions
- evaluate benefits of increasing growth with increased cost of heating/lighting and providing Co2
- Organisms in their environment
- Physical factors that may affect the distribution of organisms:
- Temperature, availability of: nutrients, light, water, oxygen, carbon dioxide
- quantative data can help descirbe how physical factors might by affecting the distribution of organisms
- quantitative data can be obtained by:
- random quantitative sampling using a quadrat or sampling along a transect
- in a large field enough random quadrats must be placed to be sure the sample is representative of the whole field (sample size)
- an estimate is usually given as a mean per square metre
- random quantitative sampling using a quadrat or sampling along a transect
- quantitative data can be obtained by:
- Physical factors that may affect the distribution of organisms:
- Valid data
- The method used in an investigation must answer the question which has been asked
- Measurements must be repeatable and reproducible
- All the variables should be controlled in an investigation
- Photosynthesis
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