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