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Biology 3.1.3 How water moves up the stem
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- 1What are the three mechanisms that keep water moving up the stem?Root pressure
Transpiration pull (cohesion and tension)
Capillary action - 2Explain root pressureWhen water and mineral ions move into the root hair cells, the cells become turgid and increases in pressure, as a result water moves to adjacent cells with less pressure, forcing water out of the roots and up the stem
- 3What three factors effect root pressure?Metabolic poison, temperature and O2 concentration
- 4How effective is root pressure?Not very, it can't get water all up the plant, just a bit
- 5Explain the transpiration pullWater molecules are attracted to each other by cohesive forces, which forms a long column f water up the stem. As water is lost at the top of the plant via transpiration, tension is created, which pulls more water up the plant. Furthermore, as the water molecules are attracted to each other, the whole column moves up, creating tension in the column
- 6What prevents the xylem from collapsing?Lignin
- 7Explain capillary actionAdhesive forces between the water molecules and the narrow xylem vessel move water up the xylem against the force of gravity.
- 8What makes capillary action effective with xylem vessels?The xylem vessels are very narrow, so there is a greater proportion of water in contact with the walls, resulting in greater adhesive forces
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- El usuario ha eliminado su información de asignaturas Fichas sobre Biology 3.1.3 How water moves up the stem, creado por Usuario eliminado el 22/04/2019.
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- Creado por Sam Gunnell · 16 abr 2019
- Copiado por Sam Gunnell · 22 abr 2019
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