Which of the following is not observed during apoplastic pathway?

1. Apoplast is continuous and does not provide any barrier to water movement.
2. Movement of water occurs through intercellular spaces and wall of the cells.
3. The movement does not involve crossing of cell membrane
4. The movement is aided by cytoplasmic streaming

Subtopic:  Pathways of transport |
 66%
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Addition of more solutes in a given solution will:
1. not affect the water potential at all
2. raise its water potential
3. lower its water potential
4. make its water potential zero

Subtopic:  Plant Water Relations: Water Potential: DPD |
 84%
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Which of the following statements above facilitated diffusion is incorrect? 

1.  Special proteins of the membrane help in this process 
2.  Porins are involved in this process
3.  Movement of the molecule occurs against the concentration gradient 
4.  ATP is not required for this process 

Subtopic:  Facilitated Diffusion |
 82%
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Phloem sap in the plants mainly consists of : 
1. fructose and water 
2. fructose and sucrose 
3. glucose and water 
4. sucrose and water 

Subtopic:  Phloem Translocation |
 77%
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Which of the following physical properties of water is/are responsible for providing water, the high tensile strength and high capillarity during ascent of sap in the plants? 
1. Surface tension and cohesion 
2. Cohesion, adhesion and surface tension 
3. Cohesion only 
4. Adhesion and cohesion 

Subtopic:  Transpiration & Guttation |
 85%
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Which of the following was proved by girdling experiment? 

1. Apoplastic movement of water occurs through intercellular spaces 
2. Symplastic movement of water occurs through interconnected protoplast 
3. Xylem is responsible for uptake of water 
4. Phloem is responsible for translocation of food 

Subtopic:  Phloem Translocation |
 84%
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When a carrier protein facilitates the movement of two molecules across the membrane in same direction, it is called :
1. Uniport
2. Transport
3. Antiport
4. Symport
Subtopic:  Facilitated Diffusion |
 85%
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The ascent of xylem sap in plants is mainly accomplished by the:
1. size of the stomatal aperture
2. distribution of stomata on the upper and lower epidermis
3. cohesion and adhesion between water molecules
4. root pressure
Subtopic:  Transpiration Pull: Illustration |
 72%
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Given below are two statements:
 
Statement I: The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.

In light of the above statements, choose the  most appropriate answer from the options given below :
1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II  are correct. 
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic:  Transpiration & Guttation | Photosynthesis Transpiration Compromise & Mineral Translocation |
 71%
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Movement and accumulation of ions across a membrane against their concentration gradient can be explained by: 
1.Active Transport2.Osmosis
3.Facilitated Diffusion 4.Passive Transport 
Subtopic:  Means of Transport: Active |
 71%
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