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  2. Plant nutrition - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrition

    Facilitated diffusion is the rapid movement of solutes or ions following a concentration gradient, facilitated by transport proteins. Active transport is the uptake by cells of ions or molecules against a concentration gradient; this requires an energy source, usually ATP, to power molecular pumps that move the ions or molecules through the ...

  3. Mineral absorption - Wikipedia

    en.wikipedia.org/wiki/Mineral_absorption

    Negative ions are carried across the plasma membrane in conjunction with H + ions as H + ions diffuse down their concentration gradient. In animals, minerals found in low small amounts are microminerals while the seven elements that are required in large quantity are known as macrominerals; these are Ca, P, Mg, Na, K, Cl, and S. In most cases ...

  4. Plant nutrients in soil - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrients_in_soil

    Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...

  5. Active transport - Wikipedia

    en.wikipedia.org/wiki/Active_transport

    This process is in contrast to passive transport, which allows molecules or ions to move down their concentration gradient, from an area of high concentration to an area of low concentration, without energy. Active transport is essential for various physiological processes, such as nutrient uptake, hormone secretion, and nerve impulse transmission.

  6. Absorption of water - Wikipedia

    en.wikipedia.org/wiki/Absorption_of_water

    A concentration gradient is established between the root and the soil water. The solute potential of xylem water is more in comparison to that of soil and correspondingly water potential is low than the soil water. If stated, water potential is comparatively positive in the soil water. This gradient of water potential causes endosmosis.

  7. Transcellular transport - Wikipedia

    en.wikipedia.org/wiki/Transcellular_transport

    Facilitated diffusion is the movement of polar molecules down the concentration gradient with the assistance of membrane proteins. Since the molecules associated with facilitated diffusion are polar, they are repelled by the hydrophobic sections of permeable membrane, therefore they need to be assisted by the membrane proteins.

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