Which of the following is not a feature of the active transport of solutes in plants?

1. Occurs against the concentration gradient

2. Non-selective

3. Occurs through membranes

4. Requires ATP

Subtopic:  Means of Transport: Active |
 87%
From NCERT
NEET - 2019
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What will be the direction of flow of water when a plant cell is placed in a Hypotonic solution?

1. Water will flow in both directions.

2. Water will flow out of the cell.

3. Water will flow into the cell.

4. No flow of water in any direction.

Subtopic:  Plasmolysis |
 81%
From NCERT
NEET - 2019
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The incorrect statement for facilitated diffusion is:

1. Special proteins help move substances across membranes without the expenditure of energy.

2. Can cause net transport of molecules from a low to a high concentration.

3. It is very specific, it allows cells to select substances for uptake.

4. Transport rate reaches a maximum when all of the protein transporters are being used.

Subtopic:  Facilitated Diffusion |
 86%
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Select incorrect statement(s):
(a) Both phloem loading and unloading are active processes.
(b) Loading of the phloem sets up root pressure that facilitates the mass movement in the phloem.
(c) As the hydrostatic pressure in the phloem sieve tube increases, pressure flow begins and the sap moves through
the phloem.

1. Both (b) & (c)
2. Both (a) & (c)
3. Only (b)
4. Only (c)

Subtopic:  Phloem Translocation |
 60%
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The water potential of pure water at standard temperatures, which is not under any pressure is taken to be equivalent to
1. Zero
2. –ψS
3. ψP
4. +ψS

Subtopic:  Plant Water Relations: Reverse Osmosis & Water potential: 1 | Plant Water Relations: Reverse Osmosis & Water Potential |
 93%
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The interconnected cells which do not show symplastic movement of water are:

1. Mesophyll cells
2. Tracheids
3. Xylem parenchyma cells
4. Cells of endodermis

Subtopic:  Plant Water Relations: Water Potential: 2 | Plant Water Relations: Reverse Osmosis & Water Potential |
From NCERT
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Select the incorrect statement regarding facilitated diffusion:-

1.  It is a very specific process

2.  It is a passive process

3.  It helps the hydrophilic substances to be transported across the membrane 

4.  It is faster than active process

Subtopic:  Facilitated Diffusion |
 77%
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Phloem sap is mainly:-

1.  Water and osmotically inactive disaccharides only

2.  Water and PGRs only

3.  Water and osmotically active disaccharides 

4.  Minerals and PGRs only

Subtopic:  Phloem Translocation |
 67%
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Simple diffusion is not saturated because

1. There is no requirement of energy

2. There is no requirement of carrier protein

4. It occurs along the concentration gradient

4. More than one option is correct 

Subtopic:  Diffusion |
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In the xylem, a continuous chain of water, when it is broken, is re-established by:
1. Guttation
2. Root pressure
3. Imbibition
4. Transpiration

Subtopic:  Ascent of Sap |
 67%
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