AP BIOLOGY

Detailed explanation-1: -In some plants sugars travel through cell walls from mesophyll cells to cell walls of companion cells and some sieve cells. Sugar is then actively transported into the phloem by a sucrose transport protein (Apoplast Pathway).

Detailed explanation-2: -In apoplast-loading species, sucrose reaches phloem parenchyma cells through plasmodesmata. Sucrose is loaded and accumulates in the phloem by passing through the apoplast between the PP and the CC.

Detailed explanation-3: -Phloem. The phloem is responsible for translocation of nutrients and sugar like carbohydrates, produced by the leaves to areas of the plant that are metabolically active. It is made up of living cells.

Detailed explanation-4: -phloem is the living tissue that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, to parts of the plant where needed. This transport process is called translocation.

Detailed explanation-5: -The sucrose is transported around the plant in phloem vessels. It needs to be able to reach all cells in the plant so that the sucrose can be converted back into glucose for respiration. The movement of sucrose and other substances like amino acids around a plant is called translocation .