AP BIOLOGY

Detailed explanation-1: -The most commonly accepted hypothesis to explain the movement of sugars in phloem is the pressure flow model for phloem transport. This hypothesis accounts for several observations: Phloem is under pressure. Translocation stops if the phloem tissue is killed.

Detailed explanation-2: -Theories of Translocation for Plant : Passive absorption and Active Absorption. Plants absorb minerals from the soil and translocate them to other parts of the body. Minerals are absorbed in the form of soil solution contained in the pore spaces between the soil particles and the root hair.

Detailed explanation-3: -Organic molecules such as sucrose and amino acids move from a source to a sink via phloem tubes in plants. The phloem is composed of living tissue called sieve tube members (lack a nucleus) that are joined end to end to form a tube that conducts food materials throughout the plant.

Detailed explanation-4: -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-5: -Translocation is the transport of sucrose and other compounds such as amino acids around a plant. In general, this occurs between the places where these substances are produced (sources) and the places where they are used or stored (sinks) in early spring: from sources in the root to sinks in the leaves.