PYQSide ExamsMy practice

Transport in Plants · Question 15

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following facilitates opening of stomatal aperture?

  1. Decrease in turgidity of guard cells
  2. Radial orientation of cellulose microfibrils in the cell wall of guard cells
  3. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
  4. Contraction of outer wall of guard cells

Answer

(2) Radial orientation of cellulose microfibrils in the cell wall of guard cells

Solution

As per NCERT, the opening of the stoma is due to an increase in turgidity of the guard cells: the outer walls bulge out and pull the thick, elastic inner walls into a crescent shape.

The opening is facilitated by the radial orientation of the cellulose microfibrils in the cell walls of the guard cells, which makes it easier for the stoma to open.

Decreased turgidity (1) closes the stoma; longitudinal microfibrils (3) and contraction of the outer wall (4) do not help opening.

Answer: (2)

Out of syllabusNEET 2017

Keep practising — Transport in Plants

2

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options.

  1. The above processes happen only during night time.
  2. One process occurs during day time and the other at night.
  3. Both processes cannot happen simultaneously.
  4. Both processes can happen together because the diffusion coefficient of water and CO2 is different.
NEET 2016 (Phase 1)
3

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

  1. Acidic
  2. Alkaline
  3. Low refractive index
  4. Absence of sugar
Out of syllabusNEET 2016 (Phase 2)
4

Root pressure develops due to

  1. passive absorption
  2. active absorption
  3. increase in transpiration
  4. low osmotic potential in soil.
Out of syllabusAIPMT 2015
5

A column of water within xylem vessels of tall trees does not break under its weight because of

  1. lignification of xylem vessels
  2. positive root pressure
  3. dissolved sugars in water
  4. tensile strength of water.
Out of syllabusAIPMT 2015
6

In a ring girdled plant

  1. the shoot and root die together
  2. neither root nor shoot will die
  3. the shoot dies first
  4. the root dies first.
Out of syllabusAIPMT 2015 (Cancelled)
7

Transpiration and root pressure cause water to rise in plants by

  1. pushing it upward
  2. pushing and pulling it, respectively
  3. pulling it upward
  4. pulling and pushing it, respectively.
Out of syllabusAIPMT 2015 (Cancelled)
8

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
Out of syllabusAIPMT 2015 (Cancelled)
9

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
10

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)
11

Guttation is the result of

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

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)