decay. places of decay river beds and ocean floors compost heaps forest floors rubbish tips sewage...

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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Introduction To Photosynthesis

…

Photosynthesis

• Occurs in all plants– Terrestrial - plants on land – Aquatic - plants in water– Phytoplankton

• Small plant like organisms floating in the oceans

• A movie

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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• Song

• Worksheet

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

• Animation…QuickTime™ and a

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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