Answer:
Step-by-step explanation:
Phloem is a specialized tissue in vascular plants that is responsible for the transport of organic compounds, such as sugars, amino acids, and hormones, from the leaves to other parts of the plant.
Phloem carries organic nutrients and hormones, produced by photosynthesis or other metabolic processes, from the leaves to the other parts of the plant, such as roots, stems, and flowers.
Sieve tubes are specialized cells found in phloem tissue that form a series of connected tubes for transporting nutrients throughout the plant. Companion cells are specialized cells that are adjacent to sieve tubes and provide them with metabolic support.
Translocation is the process by which organic compounds are transported through the phloem from the source to the sink. The source is typically the leaf, where sugars and other organic compounds are produced, while the sink is any other part of the plant where the compounds are used or stored, such as roots, stems, or flowers.
Translocation is facilitated by pressure and water potential gradients created by the active transport of sugars and other organic compounds from the source to the sink. As sugars are actively transported into the phloem, water follows by osmosis, creating a pressure gradient that moves the organic compounds toward the sink.
Aphid stylets can be used to measure phloem transport rates by inserting them into the phloem tissue and measuring the flow rate of the sap. This technique is commonly used in plant physiology research.
Radioactively-labelled CO2 can be used to measure phloem transport rates by exposing the source leaf to radioactively-labelled CO2 and then measuring the accumulation of the radioactive compounds in the sink tissue. This technique is used to track the movement of specific compounds through the phloem and to determine the rate of translocation.
PLS MARK ME BTRAINLIEST