Consider the following:
I. Creation of pull for absorption and transport in plants
II. Supply of water for photosynthesis
III. Transport of minerals from leaves to all parts of a plant
IV. Cooling of leaf surface
V. Maintenance of shape and structure of plants by keeping the cells turgid
Functions of transpiration include:
1. All
2. All but III
3. All but V
4. All but III and IV

Subtopic:  Transpiration & Guttation |
 54%
From NCERT
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The evolution of C4 photosynthetic system is probably one of the strategies for:

1. maximizing the availability of oxygen in spite of continuing high amount of water loss
2. maximizing availability of water in spite of continuing high amount of carbon dioxide loss
3. reducing the amount of water loss but leads to decreased availability of carbon dioxide
4. maximizing the availability of carbon dioxide while minimizing water loss
Subtopic:  Transpiration & Guttation | Photosynthesis Transpiration Compromise & Mineral Translocation |
 79%
From NCERT
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Unlike water, all minerals cannot be passively absorbed by the roots. This is due to:
I. Minerals are present in the soil as charged particles
II. Concentration of minerals in soil is generally less than the concentration of minerals in roots
The correct statements are:
1. Only I
2. Only II
3. Both 1 & II are incorrect
4. Both 1 & II are correct

Subtopic:  Water Potential Concept | Transpiration & Guttation |
 75%
From NCERT
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The control points where a plant adjusts the quality and types of solutes that reach the xylem are:

1. Transport proteins of endodermal cells 2. Root hair
3. Parenchyma cells of the root cortex 4. Casparian strips
Subtopic:  Stomata: 1 | Plant Water Relations: Reverse Osmosis & Water potential: 1 | Long Distance Transport of Water |
 65%
From NCERT
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Unloading of mineral ions occurs at the fine vein endings through:
1. diffusion and, are passively taken up by the sink cells
2. active transport and, are passively taken up by the sink cells
3. diffusion and, are actively taken up by the sink cells
4. active transport and, are actively taken up by the sink cells

Subtopic:  Water Absorption | Transpiration & Guttation | Pathways of transport |
From NCERT
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An analysis of xylem exudates will show that most of the nitrogen is carried as:
1. Inorganic ions
2. Ammonia dissolved in water
3. Dinitrogen
4. Organic compounds such as amino acids

Subtopic:  Water Absorption | Transpiration & Guttation |
 65%
From NCERT
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Phloem sap is mainly:
1. Glucose and Water
2. Hormones and Amino acids
3. Water and Sucrose
4. Amino acids and water

 77%
From NCERT
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Unlike xylem, the movement of sap in phloem is:
1. essentially unidirectional
2. from a sink to a source
3. independent of movement of water
4. in any direction from source to a sink

Subtopic:  Ascent of Sap |
 82%
From NCERT
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During mass flow in phloem, active transport is required:
1. For uploading sap
2. For unloading sap
3. Both for uploading and unloading the sap
4. Active transport is not required

Subtopic:  Ascent of Sap |
 79%
From NCERT
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Refer section 11.3.1, NCERT where it is stated that most of the water flow in the roots occurs via the apoplast. Why is this so?
1. Endodermis has suberized casparian strips
2. Root cortex cell lack plasmodesmata
3. Cortical cells are loosely packed
4. Root cortex is poorly organized

Subtopic:  Transpiration & Guttation | Long Distance Transport of Water |
 66%
From NCERT
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