AP BIOLOGY

Detailed explanation-1: -The companion cells are specialized parenchyma cells in the phloem tissues of the angiosperms. They are nucleated living cells with several ribosomes, plastids, and mitochondria. Their nuclei and nucleoli are relatively large (an indication of being metabolically active).

Detailed explanation-2: -Companion cells are found in the phloem of flowering plants. These are specialized parenchyma cells They are nucleated cells with ribosomes and mitochondria. Companion cells help to shift sugar and amino acids out of sieve elements.

Detailed explanation-3: -<br> Reason : The companion cells are specialised parenchymatous cells, which are closely associated with sieve tube elements.

Detailed explanation-4: -specialized parenchyma cell called a companion cell. They are derived by mitosis from the same parent cell and remain connected with each other. Photosynthates are actively secreted into, and actively removed from, sieve-tube members by their companion cells.

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.