decay. places of decay river beds and ocean floors compost heaps forest floors rubbish tips sewage...
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Decay
Places of Decay
River Beds and Ocean floors
Compost heaps Forest
Floors
Rubbish TipsSewage Treatment Plant
Swamps
Lake beds
Brainstorm
Decay
• The breaking down of matter by micro-organisms (bacteria and fungi) and the releasing of CO2 into the atmosphere.
• Micro-organisms feed on the dead matter - it is respiration of these micro organisms that produces CO2
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Compost Bins• In some ways, a compost bin works a lot like a slow
cooker.
• When organic material is heaped inside, the compost bin acts like a crock pot, allowing the ingredients to simmer slowly over low heat for a period of time.
• It uses bacteria and nitrogen instead to "cook" and break down the organic ingredients in the compost. This process of breaking down occurs in stages.
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What is the form of carbon?
What does the carbon turn into?
What is the process that changes the
carbon?
Which part of the carbon cycle does this belong
to?
Plants/Animal Material
Carbon Dioxide
Decay (Respiration of
micro-organisms)Addition
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Photosynthesis
• Occurs in all plants– Terrestrial - plants on land – Aquatic - plants in water– Phytoplankton
• Small plant like organisms floating in the oceans
How do plants grow?• Plants have their own method to make
their own food.
• It needs CO2 (from the air) and water (from the soil).
• Green chlorophyll is needed because it captures the energy from sunlight
Where in a plant does photosynthesis take place?
In the leaves!
oxygen
glucosecarbon dioxide
(from the air)
water (from the soil)
light energy
How do plants grow?Plant cells in the upper surface of leaves have chloroplasts which contain the green pigment called chlorophyll.
oxygen
glucosecarbon dioxide
(from the air)
water (from the soil)
light energy
It is chlorophyll that absorbs light energy from the Sun to make photosynthesis happen.
chlorophyll
Photosynthesis
Plants make their own food by the process of photosynthesis.
In this chemical reaction, chlorophyll in plant cells absorbs light energy to change carbon dioxide and water into glucose and the by-product oxygen.
The green chlorophyll captures the energy from the sunlight
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Photosynthesis
• What is the word equation for photosynthesis?
glucose
light energy
carbondioxide water oxygen
This equation can be read as:“carbon dioxide and water, in the presence of light energy and chlorophyll, produces glucose and oxygen”.
C6H12O6
light energy
CO2H2O O2
Photosynthesis
• For higher marks (Merits and Excellences) students must know the chemical equation…
But…What is glucose?
• Glucose is a simple carbohydrate, or sugar.
• It is very important because cells in an organism use it to provide energy, through respiration.
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What is glucose?• Its chemical formula is C6H12O6. This
means it has 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms bonded together
• Carbohydrates can be turned into more complicated molecules.
• These can help plants to grow and the carbon is passed on when they are eaten by animals
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Starch Test• Use iodine solution to test if starch is made.
• Iodine is a brown solution, if starch is made it will turn black or very dark blue
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Questions
1) Write these words down…
Glucose Chlorophyll Starch
Iodine solution Photosynthesis
Respiration Producers
Match the words you wrote down to the definitions below:
1) Living things that make their own food2) The process of building up food molecules
using light energy.3) Brown liquid used to detect starch.4) Green substance found in leaves.5) Small food molecule6) The process of releasing energy from food
molecules7) Large food molecule made by joining many
glucose molecules.
Answer these questions as a sentence…
1) Why do plants carry out photosynthesis?
2) Write the photosynthesis equation…
3) Why do plants carry out respiration?
4) Use these words to write the respiration equation:
Carbon Dioxide, Oxygen, Water, Glucose and Energy
What is the form of carbon?
What does the carbon turn into?
What is the process that changes the
carbon?
Which part of the carbon cycle does this belong
to?
Carbon DioxideGlucose
PhotosynthesisRemoval
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Microscope Experiment
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Elodea Experiment1) Using the tweezers take a single leaf from the
very tip of the plant. (peeling back the outer leaves.
2) Place the leaf gently on the slide and add a drop of water.
3) Place cover slip on gently using the tweezers.
4) Place on the microscope and take a look.
Cleaning up
1) Carefully take off the cover slips and rinse the slide and cover slip under water.
2) Put the cover slips into the meths and the slides onto the paper towel.
3) Place the microscope back
What did we see?
Starch Test