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18 Cards in this Set
- Front
- Back
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Define photosynthesis.
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the fundamental process by which plants make carbohydrates from raw materials using light energy.
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What is the point of photosnthesis for the plant?
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To make glucose for the plant as it cannot feed on other food. ie it is an autroph.
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Explain why a plant needs water.
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It is a raw product of photosynthesis.
It supports and cools the plant. It transports mineral ions from the root to the leaf. |
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Describe the energy change that takes place during photosynthesis.
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Light energy is changed to chemical energy stored in the glucose.
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Explain why root hair cells need glucose transprorted to them.
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They have no chlorophyll for photosynthesis.
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Which ions are needed for photosynthesis?
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Magnesium ions are needed to make chloropyhll and nitrate ions are needed to make cells.
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Explain why sucrose is transported through the phloem to the root
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Starch is not soluable enough because it is to big. Glucose is to osmotically active
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Describe the word equation for photosynthesis
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Carbon dioxide + water ----> starch + Oxygen
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Describe the intake of carbon dioxide and water by plants
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Carbon dioxide diffuses into the leafs spaces from the air. Water is transported from the roots to the leaf by the xylem
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Why does the plant immediatly change the glucose it makes to starch?
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Glucose is changed straight to sarch as glucose will draw water by osmosis.
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Describe an experiment to show that chlorophyl is needed for photosynthesis
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Test variegated leaf to the presence of starch. Only the green parts of th eleaf will turn blue black.
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What do we mean by a plant that has been destarched?
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It is has been kept in the dark so it can not phtosynthesise. All it's glucose has been used by respiration so it contains no starch.
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Explain the concept of a limiting factor
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In bright light plants are absorbing as much light as possible. If carbon dioxide is increased the rate of photosynthesis will increase.
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Describe and experiment to show that light is needed for photosynthesis
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Destarch two identical plants. Cover one plant so it can't get light. After two days test the plants for starch.
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Describe and experiment to show that carbon dioxide is needed for photosynthesis
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Destarch two identical plants. Place each plant in a bell jar add to one bell jar soda lime to absorb the CO2. Test the plant for stach 2 days later
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What factors will increase the rate of photosynthesis
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1) More light
2) More carbon dioxide 3) More water 4) More chlorophyl |
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Define limiting factor
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Something present in the environment in such short supply that it restricts life processes
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define water potential
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water p[otential describes the abiltity of a soultion to pull water toward it. Pure water has the highest water potential of 0.
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