CBSE Class 9 Answered

Xylem is  the type of transport tissue in vascular plants (phloem is the other). The word xylem is derived from the Greek word ????? (xylon), meaning "wood"; the best-known xylem tissue is wood, though it is found throughout the plant. Its basic function is to transport water, but it also transports some nutrients through the plant.Xylem also contains two other cell types: parenchyma and fibres.n vascular plants, phloem is the living tissue that carries organic nutrients (known as photosynthate), in particular, sucrose, a sugar, to all parts of the plant where needed. In trees, the phloem is the innermost layer of the bark, hence the name, derived from the Greek word ????? (phloos) meaning "bark". The phloem is concerned mainly with the transport of soluble organic material made during photosynthesis.Phloem tissue consists of: conducting cells, generally called sieve elements; parenchyma cells, including both specialized companion cells or albuminous cells and unspecialized cells; and supportive cells, such asfibres and sclereids.