Observe the given figure and answer the following: (i) What does the figure show? (ii) Label the parts numbered 1-4. (iii) Give the function of part 3.

(i) The given figure showing Phloem tissue. Phloem tissue is a vital component of a plant's vascular system. It is responsible for the transport of organic nutrients, particularly sugars, produced during photosynthesis in the leaves. (ii) Phloem parenchyma: Phloem parenchyma cells in the phloem tissue provide storage for starch and support to the surrounding cells. They play a role in nutrient storage and structural integrity. Companion cell: Companion cells are closely associated with sieve tube elements in the phloem. They support the metabolic functions of sieve tube elements, ensuring efficient nutrient transport. Sieve tube: A sieve tube, also known as a sieve tube element, is a specialised plant cell that is a fundamental component of the phloem tissue. Sieve plate: Sieve plates are specialised structures with perforations that connect adjacent sieve tube elements. They allow for the flow of nutrients and ensure the efficient transport of organic compounds throughout the plant. (iii) Function of Sieve tube: Sieve tubes are specialised plant cells found within the phloem tissue, one of the two essential types of vascular tissue in plants. These elongated, tube-like cells are responsible for the transport of organic nutrients, primarily sugars, from leaves to other plant parts. They form chains interconnected by sieve plates.