Biology unit 2

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Photosynthesis: CO2+water—(light energy)--> Glucose+ Oxygen
CO2 taken in by leaves, water by roots, chlorophyll traps light energy. Some of the glucose is converted into insoluble starch for storage. To test whether chlorophyll is present, we can use iodine solution, if chloophyll is present, turns navy.
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How plants use glucose
The glucose produced by photosynthesis can be:converted into starch,used foe respiration, converted into fats and oils for storage, used to produce cellulose for cell walls, used to produce proteins (other stuff e.g nitrate ions from soil are needed)
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Limiting factors
A condition which prevents a plant from reaching its full potential. Limiting factors can include light, temperature (enzymes), CO2, water etc
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Growing conditions
Plant growers can put plants in greenhouses and add CO2, control the light, temperature and water and add nitrate ions to the soil. This can be expensive so they compare the biomass of the plants with the cost of controlling these factors
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Physical factors that may affect the distribution of organisms
Temp- arctic plants small, limits no. plant eaters in area. Availability of nutrients. Amount of light e.g- few plants on forest floor, shaded plants broader leaves. Water. Oxygen-e.g in water fish need high levels. CO2
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Quantitative data can be used to describe how physical factors affect distribution of organisms in a particular habitat
Can be obtained by: -Using a quadrat being placed randomly in a field. Sample size= important, bigger the better. –Sampling along a transect, line marked between 2 points, placed at reg. intervals between. Physical factors can also be measured
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Validity – E.g- Must be done at same time of day (even if 2 months later)
Repeatable if experimenter repeats inves. using same method + equipment and obtains same results, though can be making same mistake each time. Reproducible if inves. repeated by another person or using different equip or techniques + same results.
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Card 2

Front

The glucose produced by photosynthesis can be:converted into starch,used foe respiration, converted into fats and oils for storage, used to produce cellulose for cell walls, used to produce proteins (other stuff e.g nitrate ions from soil are needed)

Back

How plants use glucose

Card 3

Front

A condition which prevents a plant from reaching its full potential. Limiting factors can include light, temperature (enzymes), CO2, water etc

Back

Preview of the back of card 3

Card 4

Front

Plant growers can put plants in greenhouses and add CO2, control the light, temperature and water and add nitrate ions to the soil. This can be expensive so they compare the biomass of the plants with the cost of controlling these factors

Back

Preview of the back of card 4

Card 5

Front

Temp- arctic plants small, limits no. plant eaters in area. Availability of nutrients. Amount of light e.g- few plants on forest floor, shaded plants broader leaves. Water. Oxygen-e.g in water fish need high levels. CO2

Back

Preview of the back of card 5
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