Food Production & the environment

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Slide 1

Food Production

Action in Plants

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Slide 2

Plant cells

Plant cells contain a jelly-like cytoplasm

They all have a nucleus

They usually have a sap-filled vacuole

The cell is surrounded by a cell membrane

Around the cell membrane there is a cellulose cell wall

Plant cells in green parts of a plant like leaves also contain chloroplasts

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Slide 3

Animal cells

Animal cells contain:

a nucleus,

cytoplasm

cell membrane

but unlike plant cells they do not have cellulose cell walls or chloroplasts

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Slide 4

Photosynthesis

This is the process by which plants produce their own food

Photosynthesis occurs in the chloroplasts found in cells in leaves

Carbon dioxide is reacted with water to produce glucose and oxygen

Chlorophyll and sunlight energy is required for this reaction to take place

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Slide 5

Chloroplasts

The cells found in leaves have lots of chloroplasts for photosynthesis to take place in.

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Slide 6

Sunlight & chlorophyll

CO2 + H2O C6H12O6 + O2

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Slide 7

What factors can affect the rate of photosynthesis?

The concentration of carbon dioxide will affect the rate of photosynthesis

As sunlight is needed for photosynthesis, the light intensity will also affect the rate of photosynthesis

Also, the temperature will also affect the rate of this reaction

From the equation for photosynthesis we can see that the amount of water available would also affect the rate of photosynthesis

Water + carbon dioxide glucose + oxygen

6H2O + 6CO2 C6H12O6 + 6O2

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Slide 8

The interdependance between plants and animals

Plants need to have a supply of carbon dioxide in the air so they can use it fir photosynthesis

Plants will give out oxygen produced from photosynthesis into the air

Animals need this oxygen for respiration to make energy

Animals produce waste carbon dioxide from respiration which is put into the air

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Slide 9