NEET BIOLOGY

Detailed explanation-1: -Phloem also helps in the transportation of various proteins like mRNA and other proteins. The four main elements of Phloem are sieve tubes, companion cells, phloem fibres and phloem parenchyma cells. This indicates that sieve tubes and companion cells form components of Phloem.

Detailed explanation-2: -The phloem is a complex tissue and is formed typically by three cell types, the sieve elements, the parenchyma cells, and the sclerenchyma cells (Figure 2a–d).

Detailed explanation-3: -phloem, plant vascular tissue that conducts foods made in the leaves during photosynthesis to all other parts of the plant. Phloem is composed of various specialized cells called sieve elements, phloem fibres, and phloem parenchyma cells.

Detailed explanation-4: -Sieve tube members do not have ribosomes or a nucleus and thus need companion cells to help them function as transport molecules. Companion cells provide sieve tube members with proteins necessary for signaling and ATP in order to help them transfer molecules between different parts of the plant.

Detailed explanation-5: -It is a complex tissue in the vascular system of higher plants that consists mainly of sieve tubes and elongated parenchyma cells usually with fibers and that functions in translocation and in support and storage. Sieve tubes and companion cells are the elements of phloem.