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Function of companion cells is

1. providing energy to sieve elements for active transport
2. providing water to phloem
3. loading of sucrose into sieve elements by passive transport
4. loading of sucrose into sieve elements

Correct answer: loading of sucrose into sieve elements

Solution

Companion cells support sieve elements by actively loading sucrose into them, which helps create the pressure needed for translocation. They are metabolically active and supply the machinery for this loading process.

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