NEET · BiologyHard
In the context of the Munch pressure-flow hypothesis, which of the following conditions would most effectively inhibit the translocation of sucrose from source to sink?
- A.Increased transpiration rate at the source
- B.Application of a metabolic inhibitor to the companion cells
- C.Increased concentration of sucrose in the sink
- D.High humidity in the surrounding environment
Show correct answer & step-by-step solution
Correct answer: B — Application of a metabolic inhibitor to the companion cells
Solution
- Phloem loading at the source is an active transport process requiring ATP.
- Companion cells utilize proton pumps to create a gradient for sucrose loading.
- Metabolic inhibitors block ATP production, preventing the active loading of sucrose into sieve tubes.
- Without the pressure gradient generated by high solute concentration, translocation stops.
- Hence the answer is (B).
Attempt this question & track your score
Sign up free to answer, get instant scoring, and let SolveGini track which Biology topics you need to revise.
Attempt & Track Free →More Plant Transport practice questions
- Which process is primarily responsible for the upward movement of water in tall trees?
- The water potential of pure water at standard temperature and pressure is equal to:
- Guttation is the process of water loss in the form of liquid droplets, typically occurring through:
- The movement of sucrose from the source to the sink in plants is explained by:
- Which pathway of water movement involves the cell walls and intercellular spaces?
- A plant cell is placed in a solution. If the cell becomes flaccid, what can be concluded about the water potential of th
- Which of the following conditions would most likely increase the rate of transpiration in a typical mesophytic plant?
- In the context of the pressure flow hypothesis for phloem transport, what is the primary driver of the movement of sucro
- Which pathway of water movement in roots involves the movement of water through the interconnected protoplasts of adjace
- If the xylem tension in a tall tree is -2.5 MPa at the top and -1.5 MPa at the base, and the distance between these poin
- During the process of stomatal opening, which sequence of events correctly describes the change in guard cell physiology
- Which of the following best explains why the symplastic pathway is considered more selective than the apoplastic pathway