Question

In root apoplast path of water transport; the water is transported through
(a) Cell wall only
(b) Cell wall and intercellular spaces
(c) Intercellular spaces
(d) Intercellular spaces, cell walls and endodermis.

Answer 1

Hint: Apoplast includes non-protoplasmic elements along with cell wall and intracellular space.

Complete answer: In apoplastic transport, water and minerals float in an upward direction via the apoplast to the xylem in the root. The concentration of solutes transported in above ground organs is established through a combination of import from the xylem, absorption by cells, and export by the phloem.

Now lets us find the solution from given options -
In the apoplast pathway, water is transported from root hair to xylem via not only the cell wall of intervening cells but also via inter cell spaces.

The water carried inside the apoplastic pathway is through the cell membrane and the intercellular areas. Water and solutes can transfer freely via them.
This occurs whilst water cannot enter the cells because of the presence of Caspian strips. The water carried inside the apoplastic pathway is through the intercellular areas and additionally via cell walls.
The apoplastic path is blocked via a means of Casparian strip of endodermal cells.

Thus, the right answer is option B. i.e. Cell wall and intercellular spaces.

Note:This apoplast pathway performs an essential role, and lets in diffusion of a solvent throughout the tissue or organ. The response to distinctive environmental and biotic stimuli in apoplast may be an oxidative burst.