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

1. respiration

2. regurgitation

3. transpiration

4. guttation

Subtopic:  Transpiration & Guttation |
 68%
From NCERT
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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.

Subtopic:  Phloem Translocation |
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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

Subtopic:  Plant Water Relations: Water Potential: 2 | Plant Water Relations: Water Potential: DPD | Plant Water Relations: Reverse Osmosis & Water Potential |
 54%
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Apparently _______________ is the source of energy for keeping stomata open.

1. photosynthesis

2. transpiration

3. ion transfer

4. sodium pump

Subtopic:  Stomata: 3 | Stomata |
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Maintaining turgor pressure in guard cells requires an uptake of

1. K+

2. H+

3. ATP

4. CO2

Subtopic:  Stomata: 3 | Stomata |
 89%
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About _______________ % of the water taken in by roots is lost by transpiration.

1. 100

2. 98

3. 90

4. 60

Subtopic:  Transpiration & Guttation |
 73%
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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

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
 84%
From NCERT
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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.

Subtopic:  Transpiration & Guttation |
 80%
From NCERT
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Stomata close when the guard cells:

1. lose water.

2. photosynthesis begins and the internal CO2 concentration decreases.

3. gain chloride ions.

4. become turgid.

Subtopic:  Stomata: 3 | Stomata |
 72%
From NCERT
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The pathway of water from the soil through the plant to the atmosphere is best represented by which of the following sequences?

1. endodermis- cortex - epidermis - vessel elements - intercellular spaces in mesophyll - stomata.

2. epidermis - cortex - Casparian strip - endodermis - sieve cells - intercellular spaces in the mesophyll - stomata.

3. Casparian strip - root hairs - epidermis - cortex - xylem - endodermis - intercellular spaces in mesophyll - stomata.

4. root hairs - cortex - endodermis - vessel elements - intercellular spaces in mesophyll - stomata.

Subtopic:  Pathways of Transport: Illustration |
 68%
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