What are the main food-carrying tubes within vascular plants? 

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The main food-carrying tubes of vascular plants is made of a tissue called phloem.

Vascular plants contain vascular plant tissues. Phloem and xylem are the two types of vascular plant tissues. Together, phloem and xylem work as a transport system to carry nutrients to the various parts of a plant.

Phloem is the plant tissue that conducts sugars and other metabolic products downwards from the leaves. Chlorophyll is a green pigment that is housed in the chloroplasts of the plant cells that make up the leaves. The chlorophyll captures sunlight energy that is to drive photosynthesis. Photosynthesis is the process during which carbon dioxide gas and water are converted into glucose sugar and oxygen gas. The glucose is used as a food source for the plant. The phloem is the tissue of vascular plants that carries this food source throughout the plant.

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