7 public questions tagged with this topic.
Endodermal lls contain Casparian strips, which regulate the selective movement of water and minerals into the vascular tissue. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Selectivity of aquaporin pores illustrates precise molecular sieving. Aquaporin-1 monomer six helical bundle creates hourglass pore length approximately twenty angstroms with two constrictions: extracellular aromatic arginine filter formed by Arg195 guanidinium, His180 imidazole, Phe56 phenyl providing size filter diameter two point eight angstroms allowing water kinetic diameter two point zero angstroms but excluding hydrated sodium diameter seven point two angstroms, glucose eight angstroms, urea larger, and electrostatic barrier preventing proton conductance via positive Arg repulsion break
Ref: Verkman et al., Aquaporin Water Channels – Physiology and Selectivity, Nature Reviews Mol Cell Biol.
Water homeostasis requires rapid equilibration across membranes due to filtration secretion challenges. Simple diffusion through lipid bilayer measurable permeability ten to minus three cm per second insufficient for tissues requiring high flux such as kidney proximal tubule collecting duct reabsorbing one eighty liters per day erythrocytes facing shear retinal epithelium astrocytes buffering potassium via swelling. Aquaporins form family of integral channels forming homotetramers where each monomer twenty eight kilodaltons six transmembrane helices two half helices conserved NPA motifs create
Ref: Agre, Nobel Lecture 2003: Aquaporins – Water Channel Discovery and Function.
The vascular tissue system, consisting of xylem and phloem, is responsible for the conduction of water, nutrients, and food in plants.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Tissue System - Epidermal Ground and Vascular
Xylem is responsible for transporting water and minerals from roots to other parts of the plant.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Xylem is responsible for the transport of water and minerals from the roots to other parts of the plant.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Xylem is responsible for the conduction of water and minerals from roots to other parts of the plant.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
