What may be regarded as a valid difference between active and passive absorption of water?

1. Passive absorption is affected by the presence of metabolic inhibitors

2. active absorption is accelerated by the presence of auxins

3. Passive absorption is dependent on development of root pressure

4. Active absorption is dependent on aerial parts of plants for the development of a pull force.

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What is never zero in a cell-

1. Solute potential

2. Water potential

3. DPD

4. Diffusion pressure

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Water potential begins to become less negative

1. in the dark of the night

2. just before dawn

3. at sunrise

4. at noon

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The amount of pressure needed to stop fluid from moving by osmosis into a solution is referred to as the

1. Osmotic pressure

2. water potential

3. pressure potential

4. solute potential

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In the absence of transpiration water moves up xylem because of

1. root pressure

2. turgor pressure

3. evaporation

4. high soil mineral concentration

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Pressure potential is positive at the time of

1. Plasmolysis

2. Transpiration

3. Guttation

4. More than one is correct

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High root pressure can cause water to be lost by leaves through the process of

1. respiration

2. regurgitation

3. transpiration

4. guttation

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When a plant is flooded it often increases its production of

1. cytokines

2. ethylene

3. gibberellins

4. all of the above

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Lowest solute potentials are found in the cells of

1. Hydrophytes

2. Xerophytes

3. Mesophytes

4. Halophytes

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The plant hormone, _______________ , plays a role in closing of stomata.

1. auxin

2. Cytokinin

3. gibberellin

4. ABA

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