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Mineral Nutrition

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Mineral Nutrition Plants are autotropic and must obtain the nutrients they need to live from the soil, which they grow. The minerals enter the plants through its roots into the xylem. Most absorption takes place in the root hair where cells in the outmost layer have extension, which penetrate between the particles in the soil. The minerals are dissolved in a film of water and diffuse into root hair cells. However, minerals are also taken up by active transport. This is because the concentration of ions in the soil is higher than the concentration in the root hair cells, so it moves against its concentration gradient. This is an active process requiring energy from respiration. Once inside the root hairs, the ions follows the uptake of water and are transported into the xylem through the symplast and apoplast pathway. ...read more.


As mentioned in the above paragraph, the water containing the minerals moves through the plant by transpiration. As water evaporates through the stoma at the bottom of the leaves, water is pulled out of the cells on the surface of the leaves. This is because water is cohesive and sticks together. As water molecule evaporates from the stoma, it creates a tension that pulls water molecules up from the roots and up the xylem tissue. There are various type of minerals, plants uptake from the soil. Each of them plays a vital role in the growth and survival of the plant. One of the most important minerals is carbon. This is what plants are mainly made of and forms the backbone of many biomolecules, including starch and cellulose. ...read more.


When growing monocultures or other crops, plant growers have to add fertilizers. In agriculture, monoculture refers to fields composed of a single crop rather than a diverse crop species. The advantages of this are that the plant competition for nutrient, space and solar radiation is reduced. However there are also problems with this method. This is where fertilizers come in. Normally, farmers grow different crops each year to put back the nutrients into the soil. Since only one type of crop is grown, the specific nutrient the crop needs will be depleted from the soil after one harvest. In order to replace the lost nutrients, farmers must used fertilizers to ensure that their crops have a sufficient amount to grow. On the other hand, not all land has the correct nutrient for plant growth. Thus, fertilizers have to be used to provide the plant with minerals that is not available in the soil, so it can grow. ?? ?? ?? ?? Stephen Ching 13SA ...read more.

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