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Transport in Plants · Question 25

AIPMT 2011 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

Guttation is the result of

  1. diffusion
  2. transpiration
  3. osmosis
  4. root pressure

Answer

(4) root pressure

Solution

As per NCERT, the effect of root pressure is observable at night and early morning when evaporation is low: excess water collects as droplets around special openings of veins near the tip of grass blades and leaves of many herbaceous parts. Such water loss in its liquid phase is known as guttation.

Guttation is the result of root pressure.

Answer: (4)

Out of syllabusAIPMT 2011 (Mains)

Keep practising — Transport in Plants

2

Guard cells help in

  1. transpiration
  2. guttation
  3. fighting against infection
  4. protection against grazing
Out of syllabusAIPMT 2009
3

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
Out of syllabusAIPMT 2008
4

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
5

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
6

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
7

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
8

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
9

Glycolate induces opening of stomata in

  1. presence of oxygen
  2. low CO2 concentration
  3. high CO2
  4. CO2 absent
Out of syllabusAIPMT 2001
10

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
11

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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