Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Plant breeding wikipedia , lookup
Plant evolutionary developmental biology wikipedia , lookup
Plant reproduction wikipedia , lookup
Plant physiology wikipedia , lookup
Plant ecology wikipedia , lookup
Glossary of plant morphology wikipedia , lookup
Plant morphology wikipedia , lookup
Turgor Pressure Turgor is a force exerted outward on a plant cell wall by the water contained in the cell. This force gives the plant rigidity, and may help to keep it erect. Turgor can result in the bursting of a cell. Definition: Turgor Pressure: also called turgidity, is the main pressure of the cell contents against the cell wall in plant cells. Turgid plant cells contain more water than flaccid cells and exert a greater pressure on its cell walls. When the vacuole is full it cause the plant to be up right, when the vacuole is empty to cause the plant to wilt. Draw an example: When material such as water, leaves the cell the pressure on the inside cell wall decreases. This means the turgor pressure on the cell wall is decreased. When material such as water leaves and enters the cell at the same rate, the pressure on the inside cell wall stays the same. This means the turgor pressure on the cell wall is not changed. When material such as water enters the cell, the pressure on the inside cell wall increases. This means the turgor pressure on the cell wall is increased. Tropism Tropism : a response of a plant to an environmental stimulus. Phototropism: a tendency of plants to grow toward a source of light. Draw an example: Thigmotropism : the response of plants to touch. Draw an example: Gravitropism/geotropism: a tendency of a plant to grow in a direction in response to the force of gravity. Negatively geotropic: means that the plant fights gravity and grow upward. Draw an example: Positively geotropic: means that the plants don’t fight against gravity and grow downward. Draw an example