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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A cell 'A' with D.P.D. = 8 is surrounded by three cells 'B', 'C' and 'D' with D.P.D. respectively 4, 6 and 5. What shall be the direction of water movement?

1. BAC
       
       D
2. A → B → C → D
3. D → C → B ← A
4. A → B ← C → D

Subtopic:  Plant Water Relations: Water Potential: DPD |
 68%
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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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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Glycolate induces the opening of stomata when: 
1.  Presence of oxygen
2.  Low CO2 conc.
3.  High CO2
4.  CO2 absent

Subtopic:  Stomata |
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 |
 92%
From NCERT
AIPMT - 2002
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Stomata of a plant open due to:

1. Influx of potassium ions

2. Efflux of potassium ions

3. Influx of hydrogen ions

4. Influx of calcium ions

Subtopic:  Stomata |
 75%
AIPMT - 2003
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