AP BIOLOGY

Detailed explanation-1: -Phloem includes four types of cells i.e. sieve tubes, companion cells, phloem fiber, and phloem parenchyma. Phloem parenchyma has dense cytoplasm and a nucleus. Sieve tubes have peripheral cytoplasm and large vacuole but lack a nucleus. Phloem companion cells are parenchymatous and these have a nucleus.

Detailed explanation-2: -The phloem element consists of the sieve tube, companion cells, parenchyma, and fiber.

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: -The structural elements of phloem include sieve tubes, companion cells, phloem parenchyma and secretory cells. The sieve tube is the conducting element of the phloem. It is formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates.

Detailed explanation-5: -Sieve tube elements, parenchyma, sclerenchyma (bast fibres) and companion cells are components of phloem.