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Transport in Plants · Question 33

AIPMT 2001MCQHard📈 Topic in 12% papers+4−1
1

Glycolate induces opening of stomata in

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

Answer

(2) low CO2 concentration

Solution

Glycolate is formed in the chloroplasts of guard cells when the CO2 concentration is low (RuBisCO acts as an oxygenase).

Its metabolism produces ATP and raises the osmotic concentration of guard cells, so water enters them and the stomata open (Zelitch's glycolate theory).

∴ Glycolate induces opening of stomata in low CO2 concentration.

Answer: (2)

Out of syllabusAIPMT 2001

Keep practising — Transport in Plants

2

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
3

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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