The phytohormone which is supposed to be one of the factor responsible for regulating the opening and closing of stomata:

1. ABA

2. GA

3. IBA

4. Kinetin

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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

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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%

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Which ion accumulate in the guard cells at the time of opening of stomata :

1. P

2. K

3. Mg

4. Ca

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Bulliform cells respond to which change?

1. Turgor pressure

2. Osmotic pressure

3. Photosensitive

4. None of above.

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Passive absorption of minerals depends on :

1. Temperature

2. Temperature and metabolic inhibitor

3. Metabolic inhibitor

4. Humidity

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

1. Imbition

2. Butteress roots

3. Prop roots

4. Turgor pressure

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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.

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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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