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| Question | Answer |
| What is the word equation for photosynthesis? | Carbon dioxide +water > glucose + oxygen |
| What is the balanced symbol equation for photosynthesis? | |
| What is the glucose used for? | -to make cellulose for plant cell walls -used to make proteins for plant growth and repair -used as energy -stored as starch -stored as fats and oils |
| What is the oxygen used for? | -used in respiration -released into air |
| Why is starch good for storage? | -it is insoluble and therefore not easily lost form the cell in solution - it is not very reactive -it does not affect the water concentration inside cells |
| What conditions are needed for photosynthesis? | Light energy and chlorophyll |
| Why does warmth increase the rate of photosynthesis? | Higher temperatures increase the rate of reaction of enzymes involved in photosynthesis. |
| What was Priestly's experiment and what did he discover? | He put part of a mint plant in a transparent closed space with a burning candle (which used up the oxygen). After 27 days he was able to relight the candle. The plant had produced oxygen. |
| What conditions speed up photosynthesis? | -warmth -increased carbon dioxide levels -increased amount of light |
| How is a leaf adapted for photosynthesis? | >the epidermis is thin and transparent, allowing light through to inner cells >the palisade cells contain large numbers of chloroplasts to absorb a lot of light energy >the chloroplasts are arranged mainly down the sides of the palisade cells, allowing some light to reach the mesophyll cells >air spaces between mesophyll cells allow gases to diffuse easily and reach all cells >the mesophyll cells are small and irregular, this increases their surface area to volume ratio so large amounts of gases can enter and exit the cells. |
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