AP BIOLOGY

Detailed explanation-1: -Carbohydrates are mainly transported in the phloem in the form of sucrose. The cell membrane of the sieve cells contains pump proteins that actively convey sucrose into the vascular pathways.

Detailed explanation-2: -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 .

Detailed explanation-3: -Carbohydrates are generally transported in plants in the form of sucrose because: It allows for efficient energy transfer and increased energy storage (sucrose is a disaccharide and therefore contains more energy)

Detailed explanation-4: -Phloem: Active transport of sucrose from source cells into phloem sieve tube elements (energy required)

Detailed explanation-5: -Sucrose is synthesized in photosynthetically active cells from fructose and glucose and is then transported via the phloem to heterotrophic parts of the plant.