Question

Which of the following best explains the diversion of water to the symplastic route once it encounters the Casparian strip?


The Casparian strip is a waxy belt that transverses the cytosol of endodermal cells.


The Casparian strip is a waxy belt that transverses the walls of endodermal cells.


The Casparian strip is a waxy belt that transverses the cells of the root cortex

Answer 1

A. i think.......

Answer 2

hold on

Answer 3

symplastic means through the cytoplasm, and it has to be through the endodermal cells... since the endodermal cells are the cells that are coated by the casparian strip

Answer 4

@vacationeer everytime i chose what you say its wrong lol no afence but ima make sure

Answer 5

pathway of water through the root

Most plants absorb water and mineral salts through roots. The path taken by the water containing mineral salts is from soil to roots and from roots to stem and leaves. Only 1% or less amount of water reach the leaves though they are absorbed in huge amounts from the soil by roots. Water and minerals penetrate the root by different paths and at last converge in the stele region of the stem. The root hair zone of young roots only absorb enormous amount of water.

The root hairs are very delicate ones which are renewed continuously by new root hairs at an average of 100 million hairs every day. Absence of cuticle provides large surface area on the root hairs and their extremely and huge number of appearance provides wide area for absorption of water. They are believed to be the extensions of the epidermal layer of cells. Presence of stick walls facilitates their adherence tightly to the soil particles. They absorb water from intervening spaces via osmosis.
Two Pathways of Water Absorption

When water enters the root epidermal region, it gets diverted into two different ways

Symplast pathway:

Water percolates through the cytoplasm of roots by traversing the plasma membrane and moves from cell to cell through the region of plasmodesmata. Plasmodesmata forms the cytoplasmic network for all the cells. Endodermis, the inner boundary of cortex is impermeable to water due to the presence of bundle of casparian strip. These are made up of suberized matrix which makes the apoplastic water also to go into the symplasm of the endodermal layer to reach the stele. From there it pierces into the plasmodesmata.

Apoplastic pathway:

The movement of water happens absolutely via the cell wall without the participation of any cell membrane. The mainstream of water passes through the apoplast pathway and the cortex layer of the root also facilitate such a movement of water. In young roots, water enters directly into the non-living parts of the roots called as xylem vessels and non-living conduits, tracheids. They are termed as apoplast. Once they reached the xylem layer, water mixes with the minerals deposited in them and move forward into the vessels and tracheids. At any point of time, water can exit the xylem and pass transversely to fulfill the needs of other tissues.
Water Absorption Mechanism

Water absorption can take place by two methods either by active diffusion or passive diffusion.

Answer 6

its a brife explantion

Answer 7

brife...my tusshy! om so long ;-;

Answer 8

@littel_red yupp i get ya.... my faults on that... hence the skeptical-ness of my answers now.... sorry bout the wrong answers before

Answer 9

ok want the answer

Answer 10

@evilbrand97 there is no use in copying the whole para to make it understand..try to shorten it please

Answer 11

its ok we all make mistakes... but im iffy thats all...

Answer 12

The answer i think is B

Answer 13

its c.

Answer 14

b? c? uhh my brain >.<

Answer 15

C. im sure of it

Answer 16

http://cronodon.com/images/Root_cortex_2.jpg

Answer 17

you all are making me lost =-=

Answer 18

See @vacationeer pic and try to answer it

Answer 19

In plant anatomy, the Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall, being made of suberin and lignin.[1] It blocks the passive flow of materials such as water and solutes into the stele of a plant. The band was first recognized as a wall structure by Robert Caspary (1818–1887).

The strip forms during the early ontogeny of the cell and is a part of the primary wall. It varies in width and is often much narrower than the wall in which it occurs. It is typically located closer to the inner tangential wall than the outer.

Answer 20

http://en.wikipedia.org/wiki/Casparian_strip

Answer 21

its a?

Answer 22

no b?

Answer 23

eah im saying b

Answer 24

Thats what I'm trying to tell...Its B

Answer 25

lol well know im using my brain! yay b!!!

Answer 26

wow you prob got it wrong cuz i say C.

Answer 27

The for SURE answer is B. Evil, you're wrong. I just answered B on this question and got it right. Thank you little red.

Answer 28

The answer IS B

Answer 29

plato user the answer is b

Answer 30

B Plato users