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Transport in Plants · Question 24

AIPMT 2011 (Mains)MCQMedium📈 Topic in 12% papers+4−1
1

Function of companion cells is :

  1. Providing water to phloem
  2. Loading of sucrose into sieve elements
  3. Loading of sucrose into sieve elements by passive transport
  4. Providing energy to sieve elements for active transport

Answer

(2) Loading of sucrose into sieve elements

Solution

As per NCERT, companion cells are connected with sieve tube elements by pit fields and help in maintaining the pressure gradient in the sieve tubes.

At the source, sucrose is moved into the companion cells and then loaded into the living phloem sieve tube cells (phloem loading); this loading is an active process, not passive.

∴ Function of companion cells is loading of sucrose into sieve elements.

Answer: (2)

AIPMT 2011 (Mains)

Keep practising — Transport in Plants

2

Guttation is the result of

  1. diffusion
  2. transpiration
  3. osmosis
  4. root pressure
Out of syllabusAIPMT 2011 (Mains)
3

Guard cells help in

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

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
5

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
6

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
7

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
8

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
9

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
10

Glycolate induces opening of stomata in

  1. presence of oxygen
  2. low CO2 concentration
  3. high CO2
  4. CO2 absent
Out of syllabusAIPMT 2001
11

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

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