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MCQs

Total Questions : 17 | Page 2 of 2 pages
Question 11.  When guard cells swell
  1.    stomata close
  2.    stomata open
  3.    photosynthesis stops
  4.    evaporation stops
 Discuss Question
Answer: Option B. -> stomata open
Question 12.  The evaporation of water from leaves is called
  1.    transpiration
  2.    cohesion
  3.    tension
  4.    pressure flow
 Discuss Question
Answer: Option A. -> transpiration
Question 13.  Normally CO2 and O2 enter a plant by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    evaporation
 Discuss Question
Answer: Option C. -> diffusion
Question 14.  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
 Discuss Question
Answer: Option C. -> Through the xylem
Question 15.  The movement of most minerals, including potassium into root cells is by
  1.    osmosis
  2.    diffusion
  3.    bulk flow
  4.    active transport
 Discuss Question
Answer: Option D. -> active transport
Question 16.  Water moves into roots of plants by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    pressure flow mechanism
 Discuss Question
Answer: Option A. -> osmosis
Question 17. . Water moves into roots of plants by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    pressure flow mechanism
 Discuss Question
Answer: Option A. -> osmosis

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