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Transport in Plants · Question 27

AIPMT 2008MCQEasy📈 Topic in 38% papers+4−1
1

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

  1. weak gravitational pull
  2. transpiration pull
  3. lignified thick walls
  4. cohesion and adhesion

Answer

(4) cohesion and adhesion

Solution

As per NCERT (cohesion–tension–transpiration pull model), water is held in the xylem as a continuous column.

Cohesion: mutual attraction between water molecules keeps the column unbroken.

Adhesion: attraction of water molecules to the polar surfaces of the tracheary elements (vessel/tracheid walls) keeps the column attached.

The water column does not rupture or break during the ascent of sap because of cohesion and adhesion (together with high tensile strength of water).

Answer: (4)

Out of syllabusAIPMT 2008

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2

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be

  1. no movement of water
  2. equilibrium between the two
  3. movement of water from cell A to B
  4. movement of water from cell B to A
Out of syllabusAIPMT 2007
3

The translocation of organic solutes in sieve tube members is supported by

  1. cytoplasmic streaming
  2. root pressure and transpiration pull
  3. P-proteins
  4. mass flow involving a carrier and ATP.
Out of syllabusAIPMT 2006
4

Potometer works on the principle of

  1. osmotic pressure
  2. amount of water absorbed equals the amount transpired
  3. root pressure
  4. potential difference between the tip of the tube and that of the plant.
Out of syllabusAIPMT 2005
5

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
Out of syllabusAIPMT 2003
6

Opening and closing of stomata is due to the

  1. hormonal change in guard cells
  2. change in turgor pressure of guard cells
  3. gaseous exchange
  4. respiration.
Out of syllabusAIPMT 2002
7

Glycolate induces opening of stomata in

  1. presence of oxygen
  2. low CO2 concentration
  3. high CO2
  4. CO2 absent
Out of syllabusAIPMT 2001
8

Loading of phloem is related to

  1. increase of sugar in phloem cell
  2. elongation of phloem cell
  3. separation of phloem parenchyma
  4. strengthening of phloem fiber
Out of syllabusAIPMT 2001
9

The movement of ions against the concentration gradient will be

  1. active transport
  2. osmosis
  3. diffusion
  4. all of the above
Out of syllabusAIPMT 2000

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