PYQSide ExamsMy practice

Transport in Plants · Question 22

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 12% papers+4−1
1

Which one gives the most valid and recent explanation for stomatal movement?

  1. Starch hydrolysis
  2. Guard cell photosynthesis
  3. Transpiration
  4. Potassium influx and efflux

Answer

(4) Potassium influx and efflux

Solution

As per the accepted (active K+ transport) theory, stomata open when K+ ions enter the guard cells (influx); water follows by osmosis, the guard cells become turgid and the pore opens.

Efflux of K+ makes the guard cells flaccid and the stoma closes.

Potassium influx and efflux is the most valid and recent explanation.

Answer: (4)

Out of syllabusAIPMT 2015 (Cancelled)

Keep practising — Transport in Plants

2

Which of the following criteria does not pertain to facilitated transport?

  1. Transport saturation
  2. Uphill transport
  3. Requirement of special membrane proteins
  4. High selectivity
Out of syllabusNEET 2013
3

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
AIPMT 2011 (Mains)
4

Guttation is the result of

  1. diffusion
  2. transpiration
  3. osmosis
  4. root pressure
Out of syllabusAIPMT 2011 (Mains)
5

Guard cells help in

  1. transpiration
  2. guttation
  3. fighting against infection
  4. protection against grazing
Out of syllabusAIPMT 2009
6

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
7

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
8

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
9

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
10

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
11

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

All Transport in Plants PYQs →

PDFDownload Transport in Plants PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)