Transport In Plants Test

Transport In Plants

This is Transport In Plants Test-04 for CBSE class 11 Biology.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Stomata close down if relative humidity of atmosphere falls below
  • A
    70%
  • B
    50%
    Correct
  • C
    60%
  • D
    80%
2
The flow of water upward through the xylem in plants can achieve fairly high rates up to 15 m height
  • A
    Transpiration
  • B
    guttation
  • C
    Transpiration pull
    Correct
  • D
    evaporation
3
The ratio of number of stomata to the total number of epidermal cells and stomata per unit leaf area is called
  • A
    Stomatal index
    Correct
  • B
    Stomatal ratio
  • C
    Epidermal index
  • D
    Stomatal count
4
When separated by a semipermeable membrane, water enters the sugar solution. What would you call the sugar solution
  • A
    Osmotic inactive
  • B
    Osmotically reactive
  • C
    Less osmotic
  • D
    Osmotically active
    Correct
5
Which part of the plant under goes transpiration?
  • A
    Leaves
    Correct
  • B
    Stem
  • C
    Flowers
  • D
    Roots
6
Mutual attraction between water molecules
  • A
    Adhesion
  • B
    Surface tension
  • C
    Capillarity
  • D
    Cohesion
    Correct
7
The instrument used for measuring rate of transpiration is
  • A
    Osmometer
  • B
    Porometer
  • C
    Potometer
    Correct
  • D
    Manometer
8
Rate of transpiration is highest when
  • A
    Soil is wet and air is dry
    Correct
  • B
    Both soil and air are dry
  • C
    Soil is dry and air is humid
  • D
    Soil is wet and air is humid
9
Opening of stomata is not affected by
  • A
    Starch
  • B
    All of above
  • C
    \(\begin{array}{*{20}{l}} {{K^ + }ions} \end{array}\)
  • D
    \(\begin{array}{*{20}{l}} {{N_2}} \end{array}\)
    Correct
10
Generally, stomata
  • A
    Open during day and close during night
    Correct
  • B
    Open during night and close at day
  • C
    Always open
  • D
    Always closed
11
In CAM plants, stomata are
  • A
    Never open
  • B
    Always open
  • C
    Open during the day and close at night
  • D
    Open during night and close during day
    Correct
12
Wilting occurs when there is
  • A
    Excessive root pressure
  • B
    Transpiration higher than absorption
    Correct
  • C
    High relative humidity of atmosphere
  • D
    Absorption higher than transpiration
13
Which one is responsible for opening and closing of stomata?
  • A
    Increasing in auxin concentration and water contents
  • B
    Abscisic acid and glucose concentration
  • C
    Rise in pH of guard cells and hydrolysis of starch
    Correct
  • D
    None of these
14
The distribution of stomata are equal on both the surface of leaf are seen in
  • A
    Monocot leaf
    Correct
  • B
    Dicot leaf
  • C
    Monocot stem
  • D
    Dicot stem
15
Absorption of water by the solid particles of an absorbent causing it to enormously increase in volume without forming a solution is called
  • A
    Imbibition
    Correct
  • B
    Adsoption
  • C
    Solubility
  • D
    Absortion