Bio 3

bio 3

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DIFFUSION

The net movement of particles from a region of high concentration to a region of low concentration i.e. down the concentration gradient

Factors: 1) Temp

2) Distance to diffuse

3) Concentration gradient

4) Surface Area to volume ratio

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OSMOSIS

The net movement of water molecules from an area of high water concentration to an area of low water concentration across a selectively permeable membrane. 

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ACTIVE TRANSPORT

The movement of particles against a concentration gradient using energy

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PHOTOSYNTHESIS

Water + CO2 = Glucose + Oxygen

- use light energy caught in chlorophyll to rip water molecules apart

Convert light energy to chemical energy

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PLANTS NEED MINERALS

Nitrates - amino acids and proteins

Lack of = poor growth + yellow leaves

Magnesium - make chlorphyll

Lack of = leaves turn yellow

Phosphates - cell mebranes and DNA

Lack of = poor root growth + leaves purple

Potassium - enzyumes 

Lack of = poor fruits + discoloured leaves.

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DIGESTION

Breakdown by organism to small organic compounds of complex nutrient

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RESPIRATION

Enzymatic release of energy from organic compounds which requires O2 or not

Oxygen + Glucose = Carbon doixide + Water + Energy

or 

Glucose = Lactic Acid + Some energy

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BREATHING SYSTEM

Ceels need constant supply of oxygen for respirtation and remove carbon dioxide, respiratory system allow exchange to take place efficiently. 

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VENTILATION

Maintains steep diffusion gradient in alveoli.

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TRANSPIRATION

The evaporation of water from the surface of a plant

1. Humidity

2. Wind speed

3. Temperature

4. Light intensirt

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TRANSPIRATION STREAM

Because of transpiration it causes water to be pulled up xylem in stem and roots in a continuous flow

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EXCRETION

Is the removal of toxic waste from the body e.g. waste products of chemical reaction, excess water and salts taken in with diet and spent hormones. 

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