If cohesion-tension transpiration theory is correct then a break in water column in xylem vessels :

1. should cause the mesophyll cells to become flaccid and result in wilting of leaves.

2. should increase the water contents of leaves

3. shouls have no effect at all

4. should increase the rate of photosynthesis.

Subtopic:  Ascent of Sap |
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Which one is not related to transpiration?

1. Bleeding

2. Circulation of water

3. Absorption and distribution of mineral salts

4. Regulation of plant body temperature.

Subtopic:  Transpiration & Guttation |
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A plasmolysed cell can be deplasmolysed by placing it in :

1. Pure water or hypotonic solution

2. Hypertonic solution

3. Isotonic solution

4, Saturated solution

Subtopic:  Plasmolysis |
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If alcohol treated cell is kept in hypertonic solution it:

1. Bursts

2. Plasmolysed

3. Remains same

4. None

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The loss of water through cuticle may reach upto :

1. 5%

2. 10%

3. 20%

4. 40%

Subtopic:  Transpiration & Guttation |
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Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock. Such a pressure is built up through the phenomenon of :

1. Imbibition

2. Buttress roots

3. Prop roots

4. Turgor pressure

Subtopic:  Imbibition |
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The cohesive force existing between molecules of water is contributing to :

1. ascent of sap

2. translocation

3. plasmolysis

4. osmosis.

Subtopic:  Ascent of Sap |
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To initiate cell plasmolysis, the salt concentration must be :

1. isotonic

2. hypertonic

3. hypotonic

4. atonic

Subtopic:  Plant Water Relations: Plasmolysis |
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Ascent of sap is mainly attributed to :

1. cohesion force

2. imbibition

3. root pressure

4. capillarity

Subtopic:  Ascent of Sap |
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Solution concentration is higher in the external solution. The solution is

1. Isotonic

2. Hypotonic

3. Hypertonic

4. None of the above.

Subtopic:  Plant Water Relations: Plasmolysis |
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