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6 Cards in this Set
- Front
- Back
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What increases the rate of diffusion/gas exchange in a plant? |
Roots- root hair cells increase the surface area to take up minerals and water faster. Leaves- internal air spaces allow air to move around the mesophyll cells again increasing surface area/. |
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What are stomata? Why and how are they controlled? |
They are holes that allow gas exchange (mainly carbon dioxide for photosynthesis) They can be controlled by guard cells to avoid too much water being lost. In some plants they are only open at night ad when it isn't too hot to decrease the rate of transpiration. |
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How do water, minerals and sugars move around the plant? |
Xylem- transport water and soluble compounds to and from the roots and stem/leaves Phloem- transport sugars from leaves to the roots where it is used for processes such as the active transport of nitrates and other minerals. |
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What are nitrates used for in a plant? |
For making amino acids. No/deficiency in nitrates leads to stunted growth. |
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What is magnesium used for in a plant? |
For making chlorophyll. No/deficiency in Mg leads to yellowing leaves. |
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What is the movement of water up a plant called? |
The transpiration steam. Transpiration- the evaporation of water from a leaf. |
