AP BIOLOGY

Detailed explanation-1: -Active transport in the root hairs of plants allows plants to absorb mineral ions, which are necessary for healthy growth, even though the concentration of minerals is usually lower in the soil than in the root hair.

Detailed explanation-2: -Ion absorption by plant roots is determined by both root physiology and the mobility of ions in the soil itself and within the soil solution. The nature of the movement of these ions in the soil and soil solution affects plant growth, crop yield, and product quality. cations, potassium (K+) and magnesium (Mg2+).

Detailed explanation-3: -Active transport – Higher tier only Minerals cannot be absorbed by osmosis because this is the movement of water only. They cannot be absorbed by diffusion, because the minerals are in very low concentration. Instead, active transport is used. The root hair cells have carrier proteins in their cell membranes.

Detailed explanation-4: -For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. Active transport then occurs across the root so that the plant takes in the ions it needs from the soil around it.

Detailed explanation-5: -Active transport is a mode of transportation in plants, which uses stored energy to move the particles against the concentration gradient. In a plant cell, it takes place in the root cells by absorbing water and minerals.