The path of water in xylem vessels and tracheids is

(1) Symplast

(2) Apoplast

(3) Both A and B

(4) Depends on gradient

Subtopic:  Water Absorption |
From NCERT
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Pinus has an/a…….. association with mycorrhizae and their …….. without the presence of mycorrhizae.

(1) Obligate, seeds cannot germinate

(2) Facultative, fruits cannot disperse

(3) Obligate, roots can not spread down the soil

(4) Facultative leaves cannot perform photosynthesis.

Subtopic:  Water Absorption |
 79%
From NCERT
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Root pressure

(1) Pushing pressure

(2) Negative pressure

(3) Tries to cope up with water requirement of well heighted plants

(4) Effects are observed at day time and evening time

Subtopic:  Transpiration & Guttation |
 75%
From NCERT
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Water loss in liquid phase from the tip of the grass blades and leaves of herbaceous parts is called

(1) Evaporation

(2) Transpiration

(3) Guttation

(4) Solarization

Subtopic:  Transpiration & Guttation |
 88%
From NCERT
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Following are some statements which ones are not incorrect?
a. Root pressure only provide a modest push in the overall process of water transport
b. Root Pressure obviously does not play a major role in water movement up tall trees
c. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecules in the xylem which often break under the enormous tensions created by transpiration
d. Most of the plants meet their need by transpiratory pull
e. The exudate of guttation has pure water only
1. a,b,d,e
2. a,b,c,d
3. b,c,d,e
4. c,d,e

Subtopic:  Transpiration & Guttation |
 68%
From NCERT
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Which of the following is an expected rate of upward flow in plants due to transpiratory pull?

(1) Up to 15 metres per hour

(2) Up to 15 meters per minute

(3) Up to 150 metres per hour

(4) Up to 200 metres per hour

Subtopic:  Transpiration & Guttation |
 69%
From NCERT
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Which of the following is a model for Transpiration?

(1) Cohesion-AdhesionTranspiration Pull Model

(2) Cohesion Tension Transpiration Pull Model

(3) Tension Transpiration Pull Model

(4) All of these

Subtopic:  Transpiration Pull: Illustration |
From NCERT
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Transpiration can be studied by

(1) Cobalt chloride paper test

(2) Chromium chloride paper test

(3) Leaf enclosed in polybag

(4) Both A and C

Subtopic:  Transpiration & Guttation |
 77%
From NCERT
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The immediate cause of opening and closing of stomata is a change in the

(1) Turgidity of subsidiary cells

(2) Flexibility of aperture

(3) Change in the turgidity of guard cells

(4) All of these

Subtopic:  Stomata: 3 | Stomata |
 62%
From NCERT
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The inner wall of guard cell is not

(1) Thin

(2) Elastic

(3) Towards the pore or stomatal aperture

(4) All of these

Subtopic:  Stomata: 1 | Stomata |
 69%
From NCERT
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