Why is food transport in phloem considered energy dependent?
Answer and explanation
Correct answer: Because food must be actively moved from the source to parts that need it
Phloem translocation distributes sugars such as sucrose from a source, usually a photosynthesising leaf, to sinks such as roots, fruits, seeds, or growing tissues. Loading sugars into sieve tubes and maintaining the pressure gradient require metabolic energy, especially from companion cells. Transport can occur in different directions according to demand. Therefore A is correct; the other choices wrongly describe phloem as dead tissue or a water-only pathway.
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What is the correct answer to this question?
Because food must be actively moved from the source to parts that need it
Why is this the correct answer?
Phloem translocation distributes sugars such as sucrose from a source, usually a photosynthesising leaf, to sinks such as roots, fruits, seeds, or growing tissues. Loading sugars into sieve tubes and maintaining the pressure gradient require metabolic energy, especially from companion cells. Transport can occur in different directions according to demand. Therefore A is correct; the other choices wrongly describe phloem as dead tissue or a water-only pathway.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Life Processes. Topic: Transportation.
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