AP BIOLOGY

Detailed explanation-1: -Phloem is one of the two tissues that make up the plant’s long-distance transport system, the other being xylem. Phloem translocates water and products of photosynthesis from source tissues to the sink regions where they are utilized or stored.

Detailed explanation-2: -This question asks us about the transport of phloem sap, which occurs in specific plant vascular tissues called the phloem. The phloem is responsible for transporting solutes like the sugars that are produced in photosynthesis and amino acids in the form of phloem sap.

Detailed explanation-3: -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-4: -Hold a leaf up to the sun and you will clearly see the veins used for fluid transport in the plant. Both the phloem and xylem forms of sap flow through these veins. Sap is the life’s blood of a plant.

Detailed explanation-5: -Sap is a fluid transported in xylem cells (vessel elements or tracheids) or phloem sieve tube elements of a plant. These cells transport water and nutrients throughout the plant.