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Transport in Plants · Question 18

AIPMT 2015MCQEasy📈 Topic in 38% papers+4−1
1

Root pressure develops due to

  1. passive absorption
  2. active absorption
  3. increase in transpiration
  4. low osmotic potential in soil.

Answer

(2) active absorption

Solution

As per NCERT, as various ions from the soil are actively transported into the vascular tissues of the roots, water follows (its potential gradient) and increases the pressure inside the xylem.

This positive pressure, called root pressure, develops due to active absorption.

Answer: (2)

Out of syllabusAIPMT 2015

Keep practising — Transport in Plants

2

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
3

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)
4

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)
5

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)
6

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
7

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)
8

Guttation is the result of

  1. diffusion
  2. transpiration
  3. osmosis
  4. root pressure
Out of syllabusAIPMT 2011 (Mains)
9

Guard cells help in

  1. transpiration
  2. guttation
  3. fighting against infection
  4. protection against grazing
Out of syllabusAIPMT 2009
10

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
11

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

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