Why is energy required for translocation of food in phloem?
Answer and explanation
Correct answer: Because dissolved sugar must be actively loaded into sieve tubes
The governing concept is pressure-flow translocation in phloem. Sugars produced at a source, usually a leaf, are actively loaded into sieve tubes using cellular energy. This lowers water potential, so water enters from nearby xylem and creates pressure. The pressure gradient helps move phloem sap toward a sink, where sugar is unloaded and used or stored. Thus option A is correct; the other choices describe unrelated or impossible processes.
Frequently asked questions
What is the correct answer to this question?
Because dissolved sugar must be actively loaded into sieve tubes
Why is this the correct answer?
The governing concept is pressure-flow translocation in phloem. Sugars produced at a source, usually a leaf, are actively loaded into sieve tubes using cellular energy. This lowers water potential, so water enters from nearby xylem and creates pressure. The pressure gradient helps move phloem sap toward a sink, where sugar is unloaded and used or stored. Thus option A is correct; the other choices describe unrelated or impossible processes.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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