Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements.

Explanation

The process of absorption can be.demarcated into two.main phases. In the 1st phase, there is an initial uptake of ions into the free space or outer space of cells - the apoplast. It is a passive process. In the second phase of uptake, the ions are taken in slowly into the inner space - the symplast. The passive movement of ions into the apoplast from the cell along the concentration gradient usually occurs through ion-channels. The entry or exit of ions, to and from the symplast against the concentration gradient requires metabolic energy which is an active process.