NEET BIOLOGY

Detailed explanation-1: -Plants have vascular tissues to transport water, nutrients and minerals. Xylem transports water and mineral salts from the roots up to other parts of the plant, while phloem transports sucrose(sugar) and amino acids between the leaves and other parts of the plants.

Detailed explanation-2: -Phloem vessels transport dissolved substances, such as sucrose and amino acids from parts of the plant where they are made (sources) to the parts of the plant where they are used (sinks).

Detailed explanation-3: -They are bordered by companion cells that carry out the cellular functions of a sieve-tube element. Phloem tubes can carry sugars and amino acids in a variety of directions; depending on where the source and the sinks are located (sometimes roots can be sources or sinks).

Detailed explanation-4: -In leaves, xylem-derived or leaf-synthesized amino acids are loaded into the phloem of minor veins and moved to sinks using differences in hydrostatic pressure between source and sink. Phloem unloading of amino acids in sinks occurs symplasmically from the sieve element (dashed line) via plasmodesmata.

Detailed explanation-5: -Phloem is an elongated, tubular shape with thin-walled sieve tubes vascular tissue. Its function is the transportation of food and nutrients such as sugar from leaves to other parts of the plant. This movement of substances is called translocation.