Pathways of Water Movement Test

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Pathways of Water Movement Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Cohesive force of water is due to

A
O-bonds

B
OH-bonds

C
S-bonds

D
H-bonds

Solution

Cohesion is the property of like molecules (of the same substance) to stick to each other due to mutual attraction. Water is strongly cohesive as each molecule may make four hydrogen bonds to other water molecules in a tetrahedral configuration.
Question 2
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Sap ascends in woody stems because of root pressure and

A
Transpiration pull

B
Capillarity

C
Molecular adhesion

D
Photosynthesis

Solution

Ascent of sap takes place by root pressure which develops transpiration pull.
Question 3
1 / -0

Most water absorption in plants takes place through

A
Root cap

B
Root apex

C
Root hair zone

D
Meristematic zone

Solution

Water absorbing part of the young roots is root hair zone. It lies between 2-10 cm. from the root tip. Root hairs are tubular extension of epiblema cells.
Question 4
1 / -0

The speed of water absorption will be greater if

A
The difference between osmotic pressure of soil water and that of xylem vessel is always less

B
The difference between osmotic pressure of soil water and that of xylem vessels is always more

C
The osmotic pressure of soil water is always more than that of xylem vessels

D
The osmotic pressure of soil water is always less than that of xylem vessels

Solution

Water is absorbed by the root hair due to osmotic differences between soil water and cell sap.
Question 5
1 / -0

Which of the following is more during the night

A
Root pressure

B
Absorption

C
Evaporation

D
Transpiration

Solution

In night, root pressure will be maximum because in night transpiration is zero.
Question 6
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Root pressure theory was proposed by ________.

A
Priestley

B
Stocking

C
Boehm

D
Dixon

Solution

Root Pressure theory was proposed by Priestley. According to this theory, the ascent of sap is due to a hydrostatic pressure developed in the roots by the accumulation of absorbed water. The pressure developing in the tracheary elements of the xylem as a result of the metabolic activities of root is referred as root pressure.
Question 7
1 / -0

In leaves, water moves

A
From tracheid of leaf to the mesophyll cells

B
From mesophyll cells tracheid of leaf

C
From palisade parenchyma to spongy parenchyma

D
From xylem to phloem

Solution

In plants, water moves from vessels and tracheids of stem into the mesophyll cells through leaf veins.
Question 8
1 / -0

Factor which affects root pressure in the root is

A
Auxin

B
Narcotics

C
Respiratory inhibitors

D
All the above

Solution

All the factors given here (auxin, narcotics and respiratory inhibitors) affect root pressure in the root.

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Pathways of Water Movement Test - 1

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Question 1

O-bonds

OH-bonds

S-bonds

H-bonds

Solution

Question 2

Transpiration pull

Capillarity

Molecular adhesion

Photosynthesis

Solution

Question 3

Root cap

Root apex

Root hair zone

Meristematic zone

Solution

Question 4

The difference between osmotic pressure of soil water and that of xylem vessel is always less

The difference between osmotic pressure of soil water and that of xylem vessels is always more

The osmotic pressure of soil water is always more than that of xylem vessels

The osmotic pressure of soil water is always less than that of xylem vessels

Solution

Question 5

Root pressure

Absorption

Evaporation

Transpiration

Solution

Question 6

Priestley

Stocking

Boehm

Dixon

Solution

Question 7

From tracheid of leaf to the mesophyll cells

From mesophyll cells tracheid of leaf

From palisade parenchyma to spongy parenchyma

From xylem to phloem

Solution

Question 8

Auxin

Narcotics

Respiratory inhibitors

All the above

Solution

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