B4 - Photosynthesis

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What is the balanced symbol equation for photosynthesis?
6CO2 + 6H20 -> C6H12O6 + 6O2
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What can simple sugars, such as glucose, be used for?
Respiration or releasing energy
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What can simple sugars, such as glucose, be converted into?
Cellulose to make cell walls, proteins for growth and repair, starch and fat and oils for storage
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Why is starch used for storage?
It is insoluble and does not move from storage areas. Unlike glucose, it does not affect the water concentration of cells and cause osmosis.
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What are the two stages in photosynthesis?
1. Water is split up by light energy releasing oxygen gas and hydrogen ions. 2. carbon dioxide gas combines with the hydrogen ions producing glucose and water.
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What did greek scientists believe?
Plants took minerals out of the soil to grow and gain mass
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What did Van Helmont's experiments show?
Plant growth is not due to only just the uptake of soil minerals, but water and light energy too.
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What did Priestley's experiments show?
That plants produce oxygen
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What do modern experiments use? and what do they show? and do?
Use a green alga called Chlorella and an isotope of oxygen 18O. Have shown that light energy is used to split water, not carbon dioxide. The water splits up into oxygen and hydrogen ions.
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What are isotopes?
Different forms of the same element
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How can the rate of photosynthesis be increased?
More carbon dioxide, mroe light, a higher temperature which increases enzyme action
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When does photosynthesis take place?
In the daytime (light)
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When does respiration take place?
All times.
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How do plants respire?
By taking in oxygen and releasing carbon dioxide.
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What is photosynthesis compared to respiration?
The reverse; photosynthesis takes in carbon dioxide and releases oxygen
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What are limiting factors?
A lack of one of the following: light, temperature and carbon dioxide
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Other cards in this set

Card 2

Front

What can simple sugars, such as glucose, be used for?

Back

Respiration or releasing energy

Card 3

Front

What can simple sugars, such as glucose, be converted into?

Back

Preview of the front of card 3

Card 4

Front

Why is starch used for storage?

Back

Preview of the front of card 4

Card 5

Front

What are the two stages in photosynthesis?

Back

Preview of the front of card 5
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