Transport of Molecules in Plant Questions and Answers

Multiple Choice Questions and Answers on Transport of Molecules in Plant

Question 1 : The cohesion-tension theory of water movement helps to explain how water moves from soil into root?

  1. Through the phloem
  2. From leaf to root
  3. Through the xylem
  4. Into the guard cells

Answer : 3

Question 2 : When guard cells swell

  1. stomata close
  2. stomata open
  3. photosynthesis stops
  4. evaporation stops

Answer : 2

Question 3 : Water moves into roots of plants by

  1. osmosis
  2. active transport
  3. diffusion
  4. pressure flow mechanism

Answer : 1

Question 4 : A widely accepted explanation for transport of sugar in phloem is called

  1. root pressure theory
  2. transpiration
  3. pressure flow hypothesis
  4. cytoplasmic streaming

Answer : 3

Question 5 : Phloem is composed of

  1. vessel elements and companion cells
  2. tracheids and vessel elements
  3. sieve-tube elements and companion cells
  4. tracheids and sieve-tube elements

Answer : 3

Question 6 : The movement of most minerals, including potassium into root cells is by

  1. osmosis
  2. diffusion
  3. active transport
  4. bulk flow

Answer : 3

Question 7 : The evaporation of water from leaves is called

  1. transpiration
  2. cohesion
  3. tension
  4. pressure flow

Answer : 1

Question 8 : Normally CO2 and O2 enter a plant by

  1. osmosis
  2. active transport
  3. diffusion
  4. evaporation

Answer : 3