why do the main vein of leaf has a double pipeline of cells?
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The veins of a leaf have double pipeline tubes because they consists of xylem and phloem which help in the transportation of water and food respectively. ... Cactus can make food without leaves because it has modified leaves in the form of spikes which contain chlorophyll and make food by the process of photosynthesis.....
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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.
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