Xylem tuition centre

Difference Between Tracheids And Vessels Food, nutrients, water, minerals are transported from roots to leaves by two types of vascular tissues, viz, xylem and phloem. Xylem tissue transports water and minerals from roots to other parts of the plants, with the help of tracheids and vessels. These Xylem tissues are also known as tracheary elements. Cells of tracheids and vessels die at maturity, they have lignified walls, and they are present in primary as well as secondary Xylem. Below are some major differences between tracheids and vessels. Tracheids vs Vessels Following are the important difference between tracheids and vessels: Tracheids Vessels Presence In all vascular plants In angiosperms Type of cells Imperforated Perforated Cell wall Thin Thick Connection Lateral End to end Cross section Polygonal Circular Water conduction Inefficient Very efficient Lumen Narrow Wide Cell length 1 mm 10 cm Surface to volume ratio High Low End walls Tapering Transverse or diagonal Pits Less large pits Large small pits What are Tracheids? Tracheids are present in the xylem of angiosperms. They are conducting elements. They are also found in gymnosperms and ferns. Tracheid cells have pointed ends. The tracheids become highly lignified on thickening of the secondary cell wall and become dead. Tracheids also provide mechanical support to the plants. They can also hold water against the force of gravity due to high surface area to volume ratio. What are Vessels? Vessels are present only...

Examinations • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Vascular Cambium Synopsis Lateral meristems are of two types – the vascular cambium and the cork cambium. The activity of the vascular cambium gives rise to secondary vascular tissues increasing the thickness of vascular tissues to fulfil the increasing needs of the growing plant for minerals, water, and food. The action of the cork cambium, also referred to as the phellogen, leads to the formation of secondary cortex and cork tissue exterior to the vascular tissues to recharge the outer layers of injured and dead cells that are sloughed off periodically with the increasing girth. Both, the cork cambium and the vascular cambium, have highly vacuolated, cuboidal cells. The vascular cambium is responsible for generating the phloem and xylem of the vascular system, utilized in supporting and transporting. These are single layers of meristematic cells which experience an expansion at the time of transition from primary to the secondary growth. The fusiform initials and ray initials – two types of cells, generate the axial and radial xylem and phloem derivatives. The various sequence and patterns of the fusiform initials are indicated in the final axial xylem and...