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Transport in plants

Transport in plants. Grade 8 biology. Diffusion . A type of passive transport(not requiring energy) involving the movement of particles from an area of higher concentration to an area of lower concentration. Diffusion is spontaneous and automatic. Osmosis.

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Transport in plants

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  1. Transport in plants Grade 8 biology

  2. Diffusion • A type of passive transport(not requiring energy) involving the movement of particles from an area of higher concentration to an area of lower concentration. • Diffusion is spontaneous and automatic.

  3. Osmosis • passage of water from a region of high water concentration, through a semi-permeable membrane, to a region of low water concentration.

  4. Endosmosis •  inward osmosis • inward passage of liquid through a membrane of a cell or cavity

  5. Exosmosis • outward osmosis • outward passage of liquid through a membrane of a cell or cavity

  6. Plasmolysis

  7. Hypertonic hypotonic and isotonic solutions • Videos on • Elodea in hypertonic solution • Elodea in hypotonic solution • Demonstration

  8. Turgor pressure( video) • also called turgidity, • is the main pressure of the cell contents against the cell wall in plant cells. • 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.

  9. Exercise • Write a letter from the cell membrane to cell wall of a plant cell, explaining how their closeness or interactions depend on the availability of water in their respective surroundings. • Make sure you use all the terms you have learnt till now !!

  10. Wall pressure • It is the pressure exerted by the cell wall on the contents of the cell, including the cell membrane.

  11. Turgid and flaccid cells • Plant cells need to be turgid (i.e rigid) to support plant tissues. • Plant cells become turgid when water moves into the cell by osmosis, and the central vacuole swells and pushes against the cell wall. • When plant cells are placed in concentrated sugar solutions they lose water by osmosis and they become "flaccid"; this is the exact opposite of "turgid" • Turgid plant cells contain more water than flaccid cells and exert a greater osmotic pressure on its cell walls.

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