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- Question
When guard cells swell
Options- A. stomata close
- B. stomata open
- C. photosynthesis stops
- D. evaporation stops
- Correct Answer
- stomata open
- 1. Water moves into roots of plants by
Options- A. osmosis
- B. active transport
- C. diffusion
- D. pressure flow mechanism Discuss
- 2. The movement of most minerals, including potassium into root cells is by
Options- A. osmosis
- B. diffusion
- C. bulk flow
- D. active transport Discuss
- 3. 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
- 4. Normally CO2 and O2 enter a plant by
Options- A. osmosis
- B. active transport
- C. diffusion
- D. evaporation Discuss
- 5. Which of the following experimental results does not support Mitchell's chemiosmosis theory?
Options- A. Electron transport in isolated mitochondria was shown to result in acidification of the medium
- B. Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
- C. Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
- D. An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport Discuss
- 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
- 7. The evaporation of water from leaves is called
Options- A. transpiration
- B. cohesion
- C. tension
- D. pressure flow Discuss
- 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
- 9. Cell fusion method includes the preparation of large number of
Options- A. plant cells stripped of their cell wall
- B. single plant cell stripped of their cell wall
- C. plant cells with cell wall
- D. cells from different species Discuss
- 10. Which of the following is considered as the disadvantage of conventional plant tissue culture for clonal propagation?
Options- A. Multiplication of sexually derived sterile hybrids
- B. Less multiplication of disease free plants
- C. Storage and transportation of propogates
- D. Both (b) and (c) Discuss
Transport of Molecules in Plant problems
Search Results
Correct Answer: osmosis
Correct Answer: active transport
Correct Answer: pressure flow hypothesis
Correct Answer: diffusion
Correct Answer: Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
Correct Answer: Through the xylem
Correct Answer: transpiration
Correct Answer: sieve-tube elements and companion cells
Correct Answer: single plant cell stripped of their cell wall
Correct Answer: Storage and transportation of propogates
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