NEET BIOLOGY

Detailed explanation-1: -Phloem transports carbohydrates, produced by photosynthesis and hydrolysis of reserve compounds, to sink tissues for growth, respiration and storage. At photosynthetic tissues, carbohydrates are loaded into phloem (Rennie and Turgeon 2009), a process that raises the solute concentration.

Detailed explanation-2: -Phloem is a vascular tissue helps in the transportation of food. The end product of photosynthesis is glucose [C6H12O6] synthesized in leaves and transported to the various storage organs like flowers, fruits, seeds and tubers etc.

Detailed explanation-3: -Phloem transport is called active because phloem loading at the source and unloading at the sink are both done by active transport. This is a biological process in which molecules move against a concentration gradient, requiring chemical energy to transport biochemical substances from a lower to a higher concentration.

Detailed explanation-4: -Xylem tissue transports water and dissolved minerals from roots to leaves, using some active transport, but mostly passive processes. Phloem tissue transports dissolved sugars up or down a plant, using active transport and osmosis.