The correct answer is Parenchyma. • Parenchyma is a living tissue in the plant cells. Explanation & Key Takeaways: • Parenchyma: • These are living polygonal cells with a big central vacuole & intercellular spaces amidst them. • Parenchymatous cells are responsible to create ground pith & tissue. • It comprising of chloroplasts and that's why it is termed chlorenchyma & it helps in photosynthesis. Important Notes: • Sclerenchyma: • It is a simple permanent plant tissue. • It provides mechanical stiffness and strength to the plants. • It is composed of dead cells i.e non-living or dead cells. • Phloem fiber: • It is narrow and elongated. • It occurs both in the primary phloem and the secondary phloem. • The fibers of sclerenchyma associated with phloem are called phloem fibres. • Tracheids: • Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. • Tracheids are one of two types of tracheary elements, vessel elements being the other. • Tracheids, unlike vessel elements, do not have perforation plates.