why phloem and xylem are called vascular tissues?


Yes, Ayushi is also right. She has answered it well! Let me add few more points.

Xylem is the vascular tissue that transports water and minerals in plants. It consists of many elements which all together form a tubular chain like structure that connects the root to the stem and the leaves of the plant. Hence, water gets transported to various parts of the plant body.
 Plants manufacture their own food by the process of photosynthesis. This process takes place in the leaves. The phloem is responsible for the transport of the food prepared in the leaves to the stem and to the roots of the plant. 
Thus, xylem and phloem are called the conducting or vascular tissues in plants that transport water and food respectively to all plant parts.

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Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally. There are also two meristems associated with vascular tissue: the vascular cambium and the cork cambium. All the vascular tissues within a particular plant together constitute the vascular tissue system of that plant.

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