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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Hydathodes

1. Are involved in Loss of water vapour from plant

2. Lose water under high pressure

3. Lose pure water

4. All of the above

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Ringing experiments prove all but

1. Food is translocated through phoem

2. Water is translocated through xylem

3. Leaves are the sinks of phloem transport

4. The phloem tissue can be regenerated if the cambium is intact.

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