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Transport in Plants · Question 31

AIPMT 2003MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(1) influx of potassium ions

Solution

Stomata open when the guard cells become turgid.

During opening, K+ ions actively move into the guard cells (with Cl-/malate as counter-ions), lowering their water potential.

⇒ Water enters the guard cells by osmosis, their turgor rises and the thin outer walls bulge out, pulling the inner walls apart, so the pore opens.

∴ Stomata open due to influx of potassium ions.

Answer: (1)

Out of syllabusAIPMT 2003

Keep practising — Transport in Plants

2

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
3

Glycolate induces opening of stomata in

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

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
5

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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