Uptake and Transport of Mineral Nutrients | Transport in Plants | Biology Class11 Chapter11 | NCERT скачать в хорошем качестве

Uptake and Transport of Mineral Nutrients | Transport in Plants | Biology Class11 Chapter11 | NCERT

All minerals can’t be passively absorbed by the roots. Most minerals must enter the root by active absorption into the cytoplasm of epidermal cells. Some ions also move into the epidermal cells passively. The endodermal cells have many transport proteins embedded in their plasma membrane; they let some solutes cross the membrane, but not others. Transport proteins of endodermal cells are control points, where a plant adjusts the quantity and types of solutes that reach the xylem. The chief sinks for the mineral elements are the growing regions of the plant, such as the apical and lateral meristems, young leaves, developing flowers, fruits and seeds, and the storage organs. Unloading of mineral ions occurs at the fine vein endings through diffusion and active uptake by these cells. Older dying leaves export much of their mineral content to younger leaves. Elements most readily mobilised are phosphorus, sulphur, nitrogen and potassium. Hence it is not that we can clearly make a distinction and say categorically that xylem transports only inorganic nutrients while phloem transports only organic materials, as was traditionally believed. #UptakeAndTransportOfMineralNutrients #TransportInPlants #neet2021 #NcertChapter11