Explain the importance of the CARBON CYCLE to living organisms.

Returns carbon from organisms to the atmosphere as CO2 to be used by plants in photosynthesis. Organisms need carbons to build complex organic mollecules. E.g. carbohydrates, fats and protein.

List the stages of the CARBON CYCLE.

1. Photosynthesis 2. Feeding 3. Respiration 4. Decay 5. Fossilisation 6. Combustion

Explain the stage PHOTOSYNTHESIS of the carbon cycle.

Plants use absorbed CO2 to make glucose -> used to make starch, cellulose, etc.

Explain the stage FEEDING of the carbon cycle.

Carbon compounds pass to other organisms.

Explain the stage RESPIRATION of the carbon cycle.

All organisms break down carbon compounds e.g. glucose-> release CO2 to atmosphere.

Explain the stage DECAY of the carbon cycle.

Micororganisms decompose dead organisms and waste, using carbon compounds for respiration, releasing CO2.

Explain the stage FOSSILISATION of the carbon cycle.

Dead organisms may form fossil fuels, e.g. coal, oil, natural gas.

Explain the stage COMBUSTION of the carbon cycle.

Burning fossil fuels converts carbon to CO2.

Explain the importance of the WATER CYCLE to living organisms.

Provides fresh wter for plants and animals on land before draining into the seas. Water is important for organisms, e,g in respiration, photosynthesis (plants), support (plants), transport.

List the stages of the WATER CYCLE.

1. Evaporation 2. Condensation 3. Precipitation 4. Surface run-off 5. Percolation 6. Transpiration 7. Respiration

Explain the stage EVAPORATION of the water cycle.

Water from seas / rivers etc turns into water vapour, due to energy from the sun.

Explain the stage CONDENSATION of the water cycle.

Water vapour turns into water droplets forming clouds, as it cools.

Explain the stage PRECIPITATION of the water cycle.

Water falls as rain, snow, hail, etc.

Explain the stage SURFACE RUN-OFF of the water cycle.

Water runs into streams / lakes / rivers / seas from ground.

Explain the stage PERCOLATION of the water cycle.

Water moves through gaps in soil / rocks.

Explain the stage TRANSPIRATION of the water cycle.

Evaporation of water from plants.

Explain the stage RESPIRATION of the water cycle.

Water released by all organisms

Explain the role of MICROORGANISMS in CYCLING MATERIALS through ecosystems.

Decompose Return carbon Release mineral ions

Explain the role of microorganisms in DECOMPOSITION.

Decompose dead organisms & waste by releasing enzymes for digestion (large -> small mollecules)

Explain the role of microorganisms in RETURNING CARBON.

Return carbon to atmosphere as CO2 by using carbon compounds for respiration.

Explain the role of microorganisms in RELEASING MINERAL IONS.

Release mineral ions e.g. nitrate into soil which can be absorbed by plant roots (active transport)

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Bio Ecology 7.2.2

GCSE AQA Double Science Biology Unit 7 Ecology 7.2.2 How material are cycled

Question	Answer
Explain the importance of the CARBON CYCLE to living organisms.	Returns carbon from organisms to the atmosphere as CO2 to be used by plants in photosynthesis. Organisms need carbons to build complex organic mollecules. E.g. carbohydrates, fats and protein.
List the stages of the CARBON CYCLE.	1. Photosynthesis 2. Feeding 3. Respiration 4. Decay 5. Fossilisation 6. Combustion
Explain the stage PHOTOSYNTHESIS of the carbon cycle.	Plants use absorbed CO2 to make glucose -> used to make starch, cellulose, etc.
Explain the stage FEEDING of the carbon cycle.	Carbon compounds pass to other organisms.
Explain the stage RESPIRATION of the carbon cycle.	All organisms break down carbon compounds e.g. glucose-> release CO2 to atmosphere.
Explain the stage DECAY of the carbon cycle.	Micororganisms decompose dead organisms and waste, using carbon compounds for respiration, releasing CO2.
Explain the stage FOSSILISATION of the carbon cycle.	Dead organisms may form fossil fuels, e.g. coal, oil, natural gas.
Explain the stage COMBUSTION of the carbon cycle.	Burning fossil fuels converts carbon to CO2.
Explain the importance of the WATER CYCLE to living organisms.	Provides fresh wter for plants and animals on land before draining into the seas. Water is important for organisms, e,g in respiration, photosynthesis (plants), support (plants), transport.
List the stages of the WATER CYCLE.	1. Evaporation 2. Condensation 3. Precipitation 4. Surface run-off 5. Percolation 6. Transpiration 7. Respiration
Explain the stage EVAPORATION of the water cycle.	Water from seas / rivers etc turns into water vapour, due to energy from the sun.
Explain the stage CONDENSATION of the water cycle.	Water vapour turns into water droplets forming clouds, as it cools.
Explain the stage PRECIPITATION of the water cycle.	Water falls as rain, snow, hail, etc.
Explain the stage SURFACE RUN-OFF of the water cycle.	Water runs into streams / lakes / rivers / seas from ground.
Explain the stage PERCOLATION of the water cycle.	Water moves through gaps in soil / rocks.
Explain the stage TRANSPIRATION of the water cycle.	Evaporation of water from plants.
Explain the stage RESPIRATION of the water cycle.	Water released by all organisms
Explain the role of MICROORGANISMS in CYCLING MATERIALS through ecosystems.	Decompose Return carbon Release mineral ions
Explain the role of microorganisms in DECOMPOSITION.	Decompose dead organisms & waste by releasing enzymes for digestion (large -> small mollecules)
Explain the role of microorganisms in RETURNING CARBON.	Return carbon to atmosphere as CO2 by using carbon compounds for respiration.
Explain the role of microorganisms in RELEASING MINERAL IONS.	Release mineral ions e.g. nitrate into soil which can be absorbed by plant roots (active transport)

Created by: claurens

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