EASY
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The tangential, as well as radial walls of the endodermal cells, have a deposition of water-impermeable, waxy material suberin in the form of
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Important Questions on Transportation in Plants and Circulation in Animals
MEDIUM
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
How does ascent of sap takes place in tall trees?
MEDIUM
Which of the following is not observed during the apoplastic pathway?
HARD
How does ascent of sap occur in tall tree?
EASY
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. |
EASY
Root pressure is usually acidic because:
MEDIUM
Explain apoplast pathway of water in plants. Draw a diagram to show major paths of water flow in plant cells.
EASY
Assertion (A): In the apoplast pathway, water movement is ultimately symplastic in the endodermis
Reason (R): Root endodermal cells are suberized
MEDIUM
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
If the humidity of the atmosphere suddenly increases substantially, the water flow in the xylem will-
EASY
A column of water within xylem vessels of tall trees does not break under its weight because of:
MEDIUM
Passage cells are thin-walled cells found in
MEDIUM
How many structures/features are associated with apoplastic movement of water?
MEDIUM
The physical properties of water like cohesion, adhesion and surface tension are responsible for
EASY
The flow of water upward through the xylem in plants can achieve fairly high rates up to
EASY
Passive absorption of water is related to all, except
EASY
The rupture and fractionation do not usually occur in the water column in vessels/tracheids during the ascent of sap because of
MEDIUM
What are the two kinds of interactions of water molecules that allow water to travel upward in plants? What other physical process aids in water transport to tops of trees?
MEDIUM
Set up an experiment to demonstrate root pressure?
EASY
The xylem in plants are responsible for?
