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Active absorption of mineral ions causes
Option: 1
High water potential in root
Option: 2
High water potential in soil
Option: 3
Low water potential in soil
Option: 4
None of these
Answers (1)
Uptake of Mineral Ions -
- Unlike water, all minerals cannot be passively absorbed by the roots.
- Two factors account for this:
- (i) minerals are present in the soil as charged particles (ions) which cannot move across cell membranes and
- (ii) the concentration of minerals in the soil is usually lower than the concentration of minerals in the root.
- Therefore, most minerals must enter the root by active absorption into the cytoplasm of epidermal cells.
- This needs energy in the form of ATP.
- The active uptake of ions is partly responsible for the water potential gradient in roots, and therefore for the uptake of water by osmosis.
- Some ions also move into the epidermal cells passively.
- Ions are absorbed from the soil by both passive and active transport.
- The active uptake of ions is partly responsible for the water potential gradient in roots, and therefore for the uptake of water by osmosis. Hence, the correct answer is option b.
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