Which statement is not true?

The casparian strips prevent water from moving.

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The endodermis is a cell layer in the cortex.

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The symplast is a meshwork consisting of the (connected) living cells.

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Water can enter the stele without entering the symplast.

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Solution

The correct option is D Water can enter the stele without entering the symplast.
The inner vascular cylinder or stele is separated from the root cortex by inner dermal layer or endodermis. The cells of endodermis are covered with casparian strips, which are impervious to water. Hence, water can not enter the stele through the apoplast pathway only. To cross the endodermal layer, the water molecules have to enter symplast and cross the cell membrane of endodermal layer.

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Similar questions

Q. Identify the correct statement related to water movement in deeper layers of the root.
A. Apoplastic movement of water does not involve the crossing of the cell membrane.
B. Symplastic movement is aided by cytoplasmic streaming.
C. Most of the water movement in the root is through symplast.
D. Water movement through the root layers is ultimately symplastic in the endodermis.

Q. Match column-I and column-II and select the correct option accordingly:

Column I	Column II
A. Stele	i. Inner most layer of cortex
B. Endodermis	ii. Suberin
C. Casparian strips	iii. The tissue external to vascular cambium
D. Bark	iv. The tissue inner to endodermis

Q. Study the following table showing the components of water potential of four cells of an actively transpiring plant.

Cell	Solute potential (MPa)	Pressure potential (MPa)
A	- 0.68	0.42
B	- 0.75	0.36
C	- 0.83	0.47
D	- 0.57	0.29

Identify the four cells as root hair, cortical cell, endodermal cell (lacking Casparian strips) and pericycle cell respectively in the young root (assuming symplastic water flow through them).

Study the following table showing the components of water potential of four cells of an actively transpiring plant.
$\begin{matrix} C e l l & S o l u t e p o t e n t i a l & P r e s s u r e p o t e n t i a l (M P a) & (M P a) A & - 0.68 & 0.42 B & - 0.75 & 0.36 C & - 0.83 & 0.47 D & - 0.57 & 0.29 \end{matrix}$
Identify the four cells as root hair, cortical cell, endodermal cell (lacking casparian strips) and pericycle cell respectively in the young root (assuming symplastic water flow through them).

The movement of sap within the xylem can be increased by

I. Movement of water into guard cell vacuoles.

II. Increase in humidity in the surrounding air.
III. Prevention of ions from entering the xylem by root endodermis.

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