EASY
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What type of bond is formed between the hydrogen atom of one water molecule and the oxygen atom of adjacent water molecule, whether hydrogen bond or Van der Waals force?

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Important Questions on Biomolecules

EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water
A column of water within xylem vessels of tall trees does not break under its weight because of:
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
Explain apoplast pathway of water in plants. Draw a diagram to show major paths of water flow in plant cells.
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
Match List I with List II: 

List I

List II
A. Cohesion  I.  More attraction in liquid phase
B. Adhesion II. Mutual attraction among water molecules
C. Surface tension III. Water loss in liquid phase
D. Guttation IV. Attraction towards polar surfaces

Choose the correct answer from the options given below: 

HARD
Biology>Cell Biology and Biomolecules>Biomolecules>Water
How does ascent of sap takes place in tall trees?
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water

Match List - I with List - II.

List-I List-II
(a) Cohesion (i) More attraction in liquid phase
(b) Adhesion (ii) Mutual attraction among water molecules
(c) Surface tension (iii) Water loss in liquid phase
(d) Guttation (iv) Attraction towards polar surfaces
EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water
If the humidity of the atmosphere suddenly increases substantially, the water flow in the xylem will-
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
Which of the following is not observed during the apoplastic pathway?
HARD
Biology>Cell Biology and Biomolecules>Biomolecules>Water
How does ascent of sap occur in tall tree?
EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water

Assertion (A): In the apoplast pathway, water movement is ultimately symplastic in the endodermis

Reason (R): Root endodermal cells are suberized

EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water

Identify the correct match of the type of water given in column-I and its character in column-II and select the correct option.

Column-I Column-II
(i) Capillary water (a) present in the form of hydrated oxides of silicon and aluminium.
(ii) Hygroscopic water (b) goes down through large pores between soil particles and reaches the water table.
(iii) Combined water (c) held in between small non-colloidal soil particles.
(iv) Gravitational water (d) held tightly around soil particles by adhesive forces.
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Biology>Cell Biology and Biomolecules>Biomolecules>Water
Root pressure is usually acidic because:
EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water
The tangential, as well as radial walls of the endodermal cells, have a deposition of water-impermeable, waxy material suberin in the form of
EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water
Movement of water through cell wall, is
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Biology>Cell Biology and Biomolecules>Biomolecules>Water
Passive absorption of water is related to all, except
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
How many structures/features are associated with apoplastic movement of water?

Question Image
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Biology>Cell Biology and Biomolecules>Biomolecules>Water
The magnitude of root pressure ranges between
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
The physical properties of water like cohesion, adhesion and surface tension are responsible for
EASY
Biology>Cell Biology and Biomolecules>Biomolecules>Water
The flow of water upward through the xylem in plants can achieve fairly high rates up to
HARD
Biology>Cell Biology and Biomolecules>Biomolecules>Water
The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
MEDIUM
Biology>Cell Biology and Biomolecules>Biomolecules>Water
When transpiration is rapid