HORTICULTURE

Detailed explanation-1: -Sugars produced in sources, such as leaves, need to be delivered to growing parts of the plant via the phloem in a process called translocation, or movement of sugar. The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks.

Detailed explanation-2: -Phloem loading is the transfer of sugars (photosynthesis) from mesophyll cells to sieve tube elements in the leaf. Phloem unloading, on the other hand, is the transport of sugars (photosynthetic) from sieve tube elements to the receiver cells of the consumption end (i.e., sink organs).

Detailed explanation-3: -Phloem are tissues that look like tubes. They transport sugars throughout the plant and supply it to tissues like roots, flowers and fruits that depend on this sugar to grow. Think of them like the veins in our body that move blood. Moving sugars from cells in the leaves to cells in the phloem is difficult for plants.