Term
| How much of the oxygen in the atmosphere is produced by plants? |
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Definition
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Term
| How much carbon is in the atmosphere and how much of that do plants fix in a year? |
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Definition
730x1012 tonnes
16% (120x1012 tonnes) |
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Term
| What is the gross primary production of plants mainly correlated with? |
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Definition
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Term
| How much of the plant cell does the vacuole occupy? |
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Definition
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Term
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Definition
| Solutes dissolved in water |
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Term
| Where else is there water in plant cells? |
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Definition
| In the matrix of chloroplasts |
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Term
| What is the water potential equation? |
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Definition
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Term
| What does each term in the equation for water potential stand for (eg ψs)? |
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Definition
ψ = water potential
ψs = solute potential
ψp = pressure potential
ψm = matric potential |
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Term
| What are two conditions about the solute potential? |
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Definition
-Always negative
-Animal cells only have solute potential |
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Term
| What are two conditions of pressure potential? |
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Definition
-Negative when sucking force
-Positive when pushing force |
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Term
| What is the condition of matric potential? |
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Definition
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Term
| What is solute potential? |
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Definition
| The movement of water by osmosis due to the presence of solutes |
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Term
| What is pressure potential? |
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Definition
| The movement of water due to hydrostatic pressure |
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Term
| What is matric potential? |
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Definition
| The pull of water into a matrix structure |
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Term
| What is the matrix in plant cells? |
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Definition
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Term
| Why does soil absorb water? |
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Definition
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Term
| Fill in the blanks of the Hoffler diagram for water potential[image] |
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Definition
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Term
| In concentrated solutions do plant cells become plasmolysed or turgid? |
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Definition
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Term
| In dilute solutions do plant cells become plasmolysed or turgid? |
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Definition
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Term
| What happens when a plant cell becomes plasmolysed? |
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Definition
All water is gone from cell
Cell dies |
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Term
| What happens when a plant cell becomes turgid? |
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Definition
The cell becomes like a brick
Hydrostatically charged |
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Term
| How do plants open and close stomata? |
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Definition
| By manipulating water potential |
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Term
| What is the process a plant does to open stomata? |
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Definition
| K+ let into guard cells, water moves in by osmosis, cell becomes turgid |
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Term
| Which two forces allow water to travel up the stem of a plant? |
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Definition
Transpirational pull
Tensile strength |
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Term
| How much of global food is produced by irrigation? |
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Definition
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Term
| How much of global fresh water is used by irrigation? |
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Definition
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Term
| Why are plants from saltmarshes and deserts studied so much? |
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Definition
| They may help to modify cops to use less water |
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Term
| Why is the manipulation of water potential so important for plants? |
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Definition
| They cannot move to water so must bring water to them |
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Term
| What does water availability to the plant mainly correlate with? |
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Definition
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Term
| What are plant-water relations important for? |
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Definition
Ecosystem dynamics
Conservation
Agriculture |
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Term
| When CO2 concentrations are high, does the plant adapt to have more or fewer stomata? |
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Definition
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Term
| What is the impact of having fewer stomata? |
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Definition
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Term
| What is the impact of less transpiration on the environment? |
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Definition
More run-off in rivers
Water content in atmosphere decreases |
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Term
| What is the impact of decreased water content in the atmosphere? |
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Definition
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