Specialised plant cells include palisade cells and guard cells in the leaves, root hair cells that help the plant absorb water and minerals from the soil and cells of the transport tissue such as xylem and phloem.Palisade mesophyll cells are present in the leaves of plants.They are close packed rectangular cells with thin cell walls. They contain lots of chloroplasts for photosynthesis and a large vacuole to maintain turgor pressure.Guard cells on the surfaces of leaves form small pores called stomata. Carbon dioxide enters the leaves through the stomata and diffuse to the palisade cells where photosynthesis takes place.When guard cells are turgid, the outer wall stretches more than the inner wall so that the stoma opens.When the cells lose water, the shape of the cell changes and the pore closes.Root hair cells at the surface of roots near the growing tip have long extensions called root hairs. These increase the surface area to absorb more water and minerals from the soil.