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U4 - PlantResponses
Plant responses and homeostasis
| Term | Definition |
|---|---|
| external stimulus | a stimulus that comes from outside an organism |
| gravitropism | another word for geotropism - when a plant grows as a reaction to gravity |
| gravity | a force that pulls objects toward each other |
| hydrotropism | a plants roots will grow toward water |
| negative geotropism | the stem of a plant grows upward against the force of gravity |
| phloem | the tissued that carries sugar and organic substances throughout the plant |
| phototropism | a plant's response to light - usually grows toward the light |
| homeostasis | maintaining a constant internal state in plant cells - when the correct temperature and water level is maintained for the plant |
| auxin | a chemical hormone that affects how a plant grows towards sunlight |
| positive geotropism | the roots of a plant grow downward in the direction of gravity |
| root system | the plant's roots, which anchor it in soil, absorb and transport water and minerals - also stores food |
| shoot system | the above ground portion of a plant body - the stems, leaves and flowers |
| stomata | small openings in a leaf that open and close to conserve water |
| thigmotropism | the turning or bending of a plant in response to touch |
| transpiration | the release of gas from a plant's leaves |
| tropism | the movement of a plant in response to an external stimulus in the environment |
| turgor pressure | the pressure inside a plant cell caused by water in the central vacuole pushing against the cell wall |
| wilting | the drying out, drooping and withering of leaves due to loss or lack of water |
| xylem | tissue in a plant that carries water upward from the roots to every part of a plant |
| stimulus | something in the internal or external environment of an organism that causes a response |
| response | the reaction an organism makes because of a change in the environment |
| force | a push or pull |
| geotropism | also called gravitropism - a plant grow in response to gravity |
| stimuli | the plural for stimulus |
| guard cells | control the opening and closing of the stomata in a plant's leaves |
| transpiration | water evaporating from a plant (water loss) |
| Oxygen and water | Exit (leave the plant) |
| chemotropism | a plant's response to chemicals |
| thermotropism | a plant's response to temperature |
| sonotropism | a plant's response to sound |
| electrotropism | a plant's response to an electrical field |
| auxin | a chemical plant hormone that causes a plant to bend toward the light |
| geo | a prefix that means earth |
| thigmo | a prefix that means touch |
| photo | a prefix that means light |
| hydro | a prefix that means water |
| vacuole | the part of a cell that fills with water to create turgor pressure in plant cells |
| wilt/wilting | what happens to a plant when there is low turgor pressure (loss of water) |
Created by:
Blackcat8765
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