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Transport in Plants · Question 10

NEET (UG) 2020MCQEasy📈 Topic in 38% papers+4−1
1

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is

  1. Transpiration
  2. Root pressure
  3. Imbibition
  4. Plasmolysis

Answer

(2) Root pressure

Solution

As per NCERT, the effect of root pressure is observable at night and early morning when evaporation is low: excess water collects as droplets around special openings of veins near the tip of grass blades and leaves of many herbaceous parts.

Such loss of water in its liquid phase is known as guttation, and it is caused by root pressure.

Transpiration is loss of water as vapour; imbibition and plasmolysis do not push water out of leaf tips.

Answer: (2)

Out of syllabusNEET (UG) 2020

Keep practising — Transport in Plants

2

What is the direction of movement of sugars in phloem?

  1. Downward
  2. Bi-directional
  3. Non-multidirectional
  4. Upward
NEET (UG) 2019
3

Xylem translocates:

  1. Water, mineral salts and some organic nitrogen only
  2. Water, mineral salts, some organic nitrogen and hormones
  3. Water only
  4. Water and mineral salts only
Out of syllabusNEET (UG) 2019
4

Stomatal movement is not affected by

  1. O2 concentration
  2. temperature
  3. CO2 concentration
  4. light
Out of syllabusNEET 2018
5

The water potential of pure water is

  1. less than zero
  2. more than zero but less than one
  3. more than one
  4. zero
Out of syllabusNEET 2017
6

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
Out of syllabusNEET 2017
7

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)
8

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)
9

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
10

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
11

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)

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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)