Question Video: Recalling How Ions Move into Plant Roots from Low Concentrations in the Soil | Nagwa Question Video: Recalling How Ions Move into Plant Roots from Low Concentrations in the Soil | Nagwa

Question Video: Recalling How Ions Move into Plant Roots from Low Concentrations in the Soil Biology • Second Year of Secondary School

If there is a high concentration of potassium ions in the root hair cells, more potassium ions can be moved into the root from a low concentration in the soil. This movement requires energy. What term is given to this process?

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Video Transcript

If there is a high concentration of potassium ions in the root hair cells, more potassium ions can be moved into the root from a low concentration in the soil. This movement requires energy. What term is given to this process?

Potassium ions are very important in various plant functions. So plants need to absorb a large amount of these ions from their environment. Most plants absorb mineral ions like potassium through their roots from soil. Plants often have specialized cells in their roots called root hair cells into which these ions can be absorbed.

When there is a higher concentration of potassium ions in the surrounding soil than in the root hair cells, these ions can move into the root hair cells passively, without using an input of energy. This passive movement, from a high to low concentration, is called diffusion. However, sometimes there is a higher concentration of potassium ions in the root hair cells than in the soil, like in the scenario that is described in the question. These ions can still be moved into the root hair cells in spite of their comparatively low concentration in the soil. The process by which this occurs is called active transport. And as the question mentions, it requires energy as the potassium ions are moving against their concentration gradient.

Therefore, the term given to the movement of potassium ions from a low to high concentration that requires energy, and the correct answer to our question, is active transport.

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