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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Loss of solutes from a cell leads to

1. Increase in water potential

2. Decrease in solute potential

3. Increase in pressure potential

4. All of the above

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Apparently _______________ is the source of energy for keeping stomata open.

1. photosynthesis

2. transpiration

3. ion transfer

4. sodium pump

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Maintaining turgor pressure in guard cells requires an uptake of

1. K+

2. H+

3. ATP

4. CO2

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About _______________ % of the water taken in by roots is lost by transpiration.

1. 100

2. 98

3. 90

4. 60

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Essential ions except _______________ are
removed from the roots and relocated through the xylem.

1. phosphorus

2. potassium

3. nitrogen

4. calcium

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Guttation is:

1. movement of soluble organic materials through plants.

2. movement of water through the apoplast.

3. evidence of root pressure.

4. negative pressure created by transpiration.

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