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

Subtopic:  Transpiration & Guttation |
 61%
From NCERT
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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

Subtopic:  Transpiration Pull: Illustration |
From NCERT
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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 soil

Subtopic:  Water Absorption |
 54%
From NCERT
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The water is free to move between the cells except through the

1. xylem

2. epidermis

3. endodermis

4. pericycle

Subtopic:  Water Absorption |
 84%
From NCERT
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Continuity of protoplasm in sieve elements is maintained through

1. Cytoplasmic strands

2. P proteins

3. Vacuoles

4. Walls

Subtopic:  Phloem Translocation |
 76%
From NCERT
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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.

Subtopic:  Transpiration & Guttation |
 68%
From NCERT
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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

Subtopic:  Transpiration & Guttation |
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A manifestation of root pressure is

1. Guttation

2. transpiration

3. Cohesion

4. Negative hydrostatic pressure

Subtopic:  Transpiration & Guttation |
 81%
From NCERT
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What is not a part of symplast?

1. Cell membrane

2. Cell wall

3. Tonoplast

4. Plasmodesmata

Subtopic:  Water Absorption |
 67%
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Mass flow seems to be the prominent mode of transport during

1. Translocation of organic solutes within phloem.

2. translocation of water and minerals in xylem

3. Apolplastic movement of water in plants

4. All of the above

Subtopic:  Phloem Translocation |
 72%
From NCERT
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