Question

the main vein of a leaf has a double pipeline of cells​

Answer 1

Answer:

The main vein is called the midrib. It is formed by a double pipeline of cells.

One pipeline carries water and minerals to all the cells of the leaf.

The other carries prepared food from the green cells to the other parts of the plant.

Explanation:

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Answer 2

Explanation:

The main vein is called the midrib.It is formed by double pipeline of a cell.One pipeline carries water and mineral to all the cell of the leaf.During photoaynthesis the leaf takes in carbon di oxide and give out oxygen and water vapour through the stomata

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