, 2. , 3. I, 4. I, 5. , 6. , 7. ]] In vascular plants, phloem's the living tissue that carries organic nutrients (known as photosynthate), particularly sucrose, a sugar, to all parts of the plant where needed. In trees, the phloem's the innermost layer of the bark, hence the name, derived from the Greek word Phloem tissue consists of less specialized and nucleate parenchyma cells, sieve-tube cells, and companion cells (in addition albuminous cells, fibres and sclereids). Sieve tubes The sieve-tu… (More on Phloem)