Question

why is the transport of phloem sap considered an active process? why is the transport of phloem sap considered an active process? phloem sap is able to move down through a plant with the force of gravity. the manufacture of sucrose via photosynthesis is driven by the energy in sunlight. transpiration is driven by the energy in sunlight. energy is used to transport sucrose into companion cells near sources, against a concentration gradient.

Answer 1

The transport of phloem sap is considered an active process beacuase  energy is used to transport sucrose into companion cells near sources, against a concentration gradient.

Phloem juice is a complex mixture of organic and inorganic substances. Previous studies have shown that sugars and amino acids are major metabolites in phloem fluid. Saccharosis is the major sugar in the phloem juice and its concentration varies between species.

Phloem transport is said to be active because both phloem loading at the source and unloading at the sink occur through the active transport. It is a biological process in which molecules move against a concentration gradient and require chemical energy to transport biochemicals from low to high concentrations.

Phloem juice contains a large amount of sugars, amino acids, vitamins, organic and inorganic acids. The main components of phloem sap are sugars and amino acids. Sucrose is the major sugar in phloem sap.

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