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Absorption of water and Ascent of sap Questions in English

Class 11 Biology · Transport in Plants · Absorption of water and Ascent of sap

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EasyMCQ
Identify the $CORRECT$ statement about the active absorption of water.
A
There is no expenditure of energy
B
The water enters the root hair by osmosis
C
The suction force is not transmitted from leaf veins to root hair
D
Living cells and root do not play an important role in water absorption

Solution

$(C)$ Active absorption of water is a process where water is absorbed by the roots through the expenditure of metabolic energy $(ATP)$.
In this process, the root cells actively accumulate solutes, which lowers their water potential, creating a gradient that pulls water into the cells.
Option $A$ is incorrect because active absorption requires energy.
Option $B$ is incorrect because osmosis is a passive process, whereas active absorption involves metabolic work.
Option $C$ is correct because in active absorption, the driving force is generated within the root cells themselves, and it does not depend on the suction force (transpiration pull) transmitted from the leaves.
Option $D$ is incorrect because living cells are essential for active absorption as they provide the energy required for the process.
152
EasyMCQ
Continuous upward flow of water stream in tall trees is maintained due to . . . . . . .
A
guttation and transpiration
B
transpiration pull only
C
cohesive force between molecules only
D
cohesive force between molecules and transpiration pull

Solution

(D) The continuous upward movement of water,known as the ascent of sap,is maintained by the cohesion-tension theory.
$1$. Cohesive forces (attraction between water molecules) and adhesive forces (attraction between water and xylem walls) prevent the water column from breaking.
$2$. Transpiration pull,generated by the evaporation of water from the leaves,creates a negative pressure (tension) that pulls the water column upward against the force of gravity.

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