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MCQs

Total Questions : 17 | Page 1 of 2 pages
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
 Discuss Question
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
 Discuss Question
Answer: Option D. -> transpiration
Question 3. Normally CO2 and O2 enter a plant by
  1.    evaporation
  2.    osmosis
  3.    active transport
  4.    diffusion
 Discuss Question
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
 Discuss Question
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
 Discuss Question
Answer: Option C. -> pressure flow hypothesis
Question 6. When guard cells swell
  1.    photosynthesis stops
  2.    evaporation stops
  3.    stomata close
  4.    stomata open
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
Answer: Option C. -> sieve-tube elements and companion cells

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