PYQSide ExamsMy practice

Transport in Plants · Question 16

NEET 2016 (Phase 1)MCQMedium📈 Topic in 12% papers+4−1
1

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.

Answer

(4) Both processes can happen together because the diffusion coefficient of water and CO2 is different.

Solution

Stomata are open during the day, so transpiration (outward diffusion of water vapour) and inward diffusion of CO2 occur at the same time through the same pore.

⇒ Each gas diffuses independently along its own concentration gradient; water vapour and CO2 have different diffusion coefficients, so the two fluxes do not hinder each other.

∴ Both processes can happen together.

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Transport in Plants

2

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)
3

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
4

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
5

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)
6

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)
7

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)
8

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
9

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)
10

Guttation is the result of

  1. diffusion
  2. transpiration
  3. osmosis
  4. root pressure
Out of syllabusAIPMT 2011 (Mains)
11

Guard cells help in

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

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)