A. Sieve tubes - Perforated end walls
B. Companion cells - Connected to sieve tubes
C. Phloem parenchyma - Dense cytoplasm
D. Phloem fibres - Sclerenchymatous
Sieve tube is a long tube-like structure with perforation in the end wall.
Companion cells are associated with sieve tubes.
Phloem parenchyma has dense cytoplasm.
Phloem fibres have sclerenchymatous cells.