Transport Of Molecules In Plant(Biotechnology ) Questions and Answers

Question 1. Phloem is composed of
  1.    vessel elements and companion cells
  2.    tracheids and sieve-tube elements
  3.    tracheids and vessel elements
  4.    sieve-tube elements and companion cells
Explanation:-
Answer: Option D. -> sieve-tube elements and companion cells
Question 2. The evaporation of water from leaves is called
  1.    pressure flow
  2.    cohesion
  3.    tension
  4.    transpiration
Explanation:-
Answer: Option D. -> transpiration
Question 3. Normally CO2 and O2 enter a plant by
  1.    evaporation
  2.    osmosis
  3.    active transport
  4.    diffusion
Explanation:-
Answer: Option D. -> diffusion
Question 4. The movement of most minerals, including potassium into root cells is by
  1.    active transport
  2.    diffusion
  3.    bulk flow
  4.    osmosis
Explanation:-
Answer: Option A. -> active transport
Question 5. A widely accepted explanation for transport of sugar in phloem is called
  1.    root pressure theory
  2.    cytoplasmic streaming
  3.    pressure flow hypothesis
  4.    transpiration
Explanation:-
Answer: Option C. -> pressure flow hypothesis
Question 6. When guard cells swell
  1.    photosynthesis stops
  2.    evaporation stops
  3.    stomata close
  4.    stomata open
Explanation:-
Answer: Option D. -> stomata open
Question 7. Water moves into roots of plants by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    pressure flow mechanism
Explanation:-
Answer: Option A. -> osmosis
Question 8. The cohesion-tension theory of water movement helps to explain how water moves from soil into root?
  1.    Through the xylem
  2.    From leaf to root
  3.    Into the guard cells
  4.    Through the phloem
Explanation:-
Answer: Option A. -> Through the xylem
Question 9.  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
Explanation:-
Answer: Option C. -> pressure flow hypothesis
Question 10.  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
Explanation:-
Answer: Option C. -> sieve-tube elements and companion cells
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