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plant transport
LC BIO plant transport & osmosis
| Question | Answer |
|---|---|
| name the tissue that transports water in roots | xylem |
| How have root hairs adapted to better suit absorption of water | numerous, thin walled, large surface area. |
| how does water enter the plant | through osmosis |
| give two ways in which xylem has adapted to transporting water | narrow, hollow, is a continuous tube |
| in which zone is water absorbed from the soil | the differentiation zone |
| what tissue transports the products of photosynthesis | phloem |
| name two structural features of phloem | has sieve tubes, has companion cells, |
| describe the relationship between rates of water uptake and transpiration. | They both increase and decrease at the same time |
| describe the reason for the relationship between rates of water uptake and transpiration. | high rates of transpiration allows more water to be taken in, to replace what is lost. |
| what is the name of the cells that control the stomata | guard cells |
| what are the advantages of having stomata on the bottom of the leaf | reduces water loss by evaporation |
| name the two irish scientists who proposed the theory of water movement in plants | Dixon and Joly. |
| give a disadvantage to plants of a high rate of transpiration | wilting may occur |
| what do plants typically do in response to wilting | close their stomata |
| describe the term turgor in plants | the pressure of the cell contents against the cell wall |
| how do plant cells remain turgid | by taking in the same amount of water as they lose by osmosis |
| what happens to plants if they lose turgidity | they wilt |
| name the three mechanisms that cause water to move upwards in pants | root pressure, cohesion-tension model, transpiration |
| Explain how root pressure causes movement of water in plants | water comes into the plant and pushes water insides the plant upwards |
| Explain how transpiration causes movement of water in plants | k |
| what is transpiration | the loss of water by evaporation from the surface of the leaf |
| explain the cohesion-tension model. | |
| How do minerals enter the plant | firstly by diffusion, and then by active transport |
| how are leaves adapted to gaseous exchange | flat, numerous stomata, ground tissue is loosely arranged with air spaces |
| How do the stomata open | Low co2 levels in plant,potassium ions enter guard cells, osmosis occurs in cells nearby causing guard cells to swell, curve and thereby opening the stomata |
| How do stomata close | At night, co2 levels increase in guard cells. This causes potassium ions to leave. Osmosis draws waterout of nearby cells.and they shrink closing the stomata. |
| How are leaves adapted for gaseous exchange | Flat, numerous stomata, ground tissue loosely arranged with air spaces |
| Function of meristematic zone | Cells rapidly divide by mitosis |
| Function of elongation zone | Cells increase in size and elongate |
| Function of differentiation zone | Cells differentiate into either dermal vascular or ground tissue |
| Describe monocots | Disorganized vascular bundles, herbaceous, usually fibrous roots EG grasses, bluebells |
| Describe dicots | Organized vascular bundle, usually tap root, either woody or herbaceous |
Created by:
sadhbh 1