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

1. ascent of sap

2. translocation

3. plasmolysis

4. osmosis.

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To initiate cell plasmolysis, the salt concentration must be :

1. isotonic

2. hypertonic

3. hypotonic

4. atonic

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The most accepted theory for stomatal opening and closing is :

1. transpiration

2. guard cell photosynthesis

3. K+ efflux and influx

4. starch glucose interconversion.

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Ascent of sap is mainly attributed to :

1. cohesion force

2. imbibition

3. root pressure

4. capillarity

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Water lost by transpiration is :

1. rich in solutes

2. rich in dissolved roots

3. rich in dissolved minerals

4. pure water.

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Main function of lenticels is :

1. transpiration

2. guttation

3. gaseous exchange

4. translocation

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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.

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In CAM plants, stomata are :

1. always open

2. never open

3. open during day and close at night

4. open during night and close during the day.

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Wilting occurs when there is :

1. transpiration higher than absorption

2. absorption higher than transpiration

3. high relative humidity of atmosphere

4. excessive root pressure.

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Which one is responsible for opening and closing of stomata :

1. Rise in pH of guard cells, hydrolysis of starch

2. Cytolinins and CAMP required

3. Abscisic acid promotes closure

4. All the above.

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