AP BIOLOGY

Detailed explanation-1: -Aphids feed mostly on the phloem sap of their host plant, which is high in sucrose and lacking in essential amino acids, resulting in an unbalanced diet [1, 2].

Detailed explanation-2: -The movement of sucrose and other substances like amino acids around a plant is called translocation . In general, this happens between where these substances are made (the sources) and where they are used or stored (the sinks): from sources in the root to sinks in the leaves in early spring time.

Detailed explanation-3: -The process of movement of food from the leaves to the other parts of the plant is called translocation. Translocation of food takes place through the phloem which carries the food produced through photosynthesis in the leaves to the other plant parts.

Detailed explanation-4: -Xylem transports water, minerals, and nutrients from the soil to all the plant parts. There are two types of “transport” tissues in plants-xylem and phloem. Water and solutes are transported by the xylem from the roots to the leaves, and food is transported from the leaves to the rest of the plant by the phloem.