Osmotic potential and water potential of pure water are respectively:
1.  0 and 0
2.  0 and 1
3.  100 and 0
4.  100 and 100

Subtopic:  Osmosis | Water Potential Concept |
 85%
From NCERT
AIPMT - 1998
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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 |
 72%
From NCERT
AIPMT - 1999
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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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The movement of ions against the concentration gradient will be:

1. Active transport 2. Osmosis
3. Diffusion 4. All of the above
Subtopic:  Means of Transport: Active |
 90%
From NCERT
AIPMT - 2000
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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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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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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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Match List - I with List-II.

List-I List-II
a. Cohesion
b. Adhesion
c. Surface tension
d. Guttation
i. More attraction in the liquid phase
ii. Mutual attraction among water molecules
iii. Water loss in liquid phase
iv. Attraction toward polar surfaces

Choose the correct answer from the options given below:

Options: (a) (b) (c) (d)
1. iii i iv ii
2. ii i iv iii
3. ii iv i iii
4. iv iii ii i


 

Subtopic:  Transpiration & Guttation |
 73%
From NCERT
NEET - 2021
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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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