When water moves through a semipermeable membrane then which of the following pressure develops:
1.  O.P.
2.  S.P.
3.  T.P.
4.  W.P.

Subtopic:  Osmosis |
 71%
From NCERT
AIPMT - 2001
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Loading of phloem is related to:
1.  Increase of sugar in phloem
2.  Elongation of phloem cell
3.  Separation of phloem parenchyma
4.  Strengthening of phloem fiber

Subtopic:  Phloem Translocation |
 91%
From NCERT
AIPMT - 2001
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Opening and closing of stomata are due to the:

1. Hormonal change in guard cells

2. Change in Turgor pressure of guard cells

3. Gaseous exchange

4. Respiration

Subtopic:  Stomata |
 91%
From NCERT
AIPMT - 2002
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Casparian bands are found in:

1. Endodermis 2. Pericycle
3. Periderm 4. Cortex
Subtopic:  Pathways of transport |
 90%
From NCERT
AIPMT - 1999
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What shall be the water potential of a root hair cell absorbing water from the soil?
1.  Zero
2.  Less than zero
3.  More than zero
4.  Infinite

Subtopic:  Water Potential Concept |
 71%
From NCERT
AIPMT - 1999
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Function of companion cells is:

1. Loading of sucrose into sieve elements
2. Providing energy to sieve elements for active transport
3. Providing water to phloem
4. Loading of sucrose into sieve elements by passive transport
Subtopic:  Phloem Translocation |
 60%
From NCERT
AIPMT - 2011
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Guttation is the result of:
1. Root pressure
2. Diffusion
3. Transpiration
4. Osmosis

Subtopic:  Transpiration & Guttation |
 89%
From NCERT
AIPMT - 2011
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Select the incorrect statement.

1. Transport of molecules in phloem can be bidirectional.
2. The movement of minerals in the xylem is unidirectional.
3. Unloading of sucrose at the sink does not involve the utilization of ATP.
4. Elements most easily mobilized in plants from one region to another are phosphorus, sulfur, nitrogen, and potassium.

Subtopic:  The Pressure Flow or Mass Flow Hypothesis |
 81%
From NCERT
NEET - 2020
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Match the following and choose the correct option.

Column I

Column II

A. Leaves

(i) Anti – transpirant

B. Seed

(ii) Transpiration

C. Roots

(iii)Negative osmotic potential

D. Aspirin

(iv) Imbibition

E. Plasmolysed Cell

(v) Absorption

Codes
1. A-ii, B-iv, C-v, D-i, E-iii

2. A-iii, B-ii, C-iv, D-i, E-v

3. A-i, B-ii, C-iii, D-iv, E-v

4. A-v, B-iv, C-iii, D-ii, E-i

Subtopic:  Water Absorption | Transpiration & Guttation | Imbibition |
 91%
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Based on the figure given below, which of the following statements is not correct?


 

1. Movement of solvent molecules will take place from chamber A to B.
2. Movement of solute will take place from A to B.
3. Presence of a semipermeable membrane is a pre-requisite for this process to occur.
4. The direction and rate of osmosis depend on both the pressure gradient and concentration gradient.

Subtopic:  Osmosis |
 74%
From NCERT
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