What seems to be the most valid statement about root pressure?

1. It is the positive pressure responsible for transport of water most commonly.

2. It may provide a considerable push to the water column during transport.

3. It may help re establish the broken water columns during transpiration

4. Its effect is most observable during mid day

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A structural attribute of guard cells that aid in its effective functioning is

1. Large cell size

2. Radial micellation in walls

3. Thick walls

4. All of the above

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Not an aid to water absorption is

1. The high surface area of roots

2. High water potential of root hair cells

3. Thin cellulosic walls of root hair zone

4. Low concentration of solutes in the epidermal cells

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The presence of free starch in the cell will serve to

1. Increase its water potential

2. Decrease its water potential by virtue of solutes

3. Increase solute potential by virtue of solutes.

4. Decrease its water potential by virtue of matric potential.

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The water is free to move between the cells except through the

1. xylem

2. epidermis

3. endodermis

4. pericycle

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Translocation does not involve

1. a pressure difference between the source and the sink

2. Same velocity of transport of all substances together.

3. Transport of each substance according to its concentration gradient

4. None of the above

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Continuity of protoplasm in sieve elements is maintained through

1. Cytoplasmic strands

2. P proteins

3. Vacuoles

4. Walls

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Which is not an advantage of transpiration.

1. Maintains shape of cells by keeping them turgid

2. Cools down plant surfaces by evaporative cooling

3. Transports minerals.

4. None of the above.

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One of the following is not a pre-requisite for transpiration?

1. high Vapour pressure deficit of atmosphere

2. Low atmospheric humidity

3.High soil water potential 

4. Sunny weather

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A manifestation of root pressure is

1. Guttation

2. transpiration

3. Cohesion

4. Negative hydrostatic pressure

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