Reproduction in Plants. Reproduction in Humans. Endocrine system and Adolescence. The Circulatory System. Nervous System. Disease and First Aid. Food Production. Short Answer Questions SA. Long Answer Questions LA.
Xylem Phloem Xylem is the complex tissue of plants, responsible for transporting water and other nutrients to the plants. Phloem is living tissue, responsible for transporting food and other organic materials. Xylem consists of dead cells parenchyma is the only living cells present in the xylem. Pholem mainly contains living cells fibres are the only dead cells in the phloem. They comprise of xylem vessels, fibre and tracheids. They comprise of phloem fibres, sieve tubes, sieve cells, phloem parenchyma and companion cells.
Xylem is located in the centre of the vascular bundle, deep in the plant. Phloem is located on the outer side of the vascular bundle. Their movement is unidirectional. Their movement is bidirectional. In the root, the xylem forms a central column, forming a solid support. The phloem is towards the centre, outside the xylem. In the stem, the transport tissues of the xylem and phloem are grouped into vascular bundles.
Plant transport tissues - xylem and phloem Plants have two transport systems - xylem and phloem. Xylem The xylem transports water and minerals from the roots up the plant stem and into the leaves.
Vessels: Lose their end walls so the xylem forms a continuous, hollow tube. This allows water to flow easily. Become strengthened by a chemical called lignin. The cells are no longer alive. Lignin gives strength and support to the vessel. Phloem Phloem moves sugar that the plant has produced by photosynthesis to where it is needed for processes such as: growing parts of the plant for immediate use storage organs such as bulbs and tubers developing seeds respiration Transport in the phloem is therefore both up and down the stem.
The flow of water in this process is unidirectional, i. Phloem is also the types of transport tissue in vascular plants. They are the living and permanent tissue, responsible for carrying the food and soluble organic nutrients. These organic nutrients are named as photosynthates, which is a glucose and is transported to every part of the plant, wherever necessary.
The phloem surrounds xylem. Phloem is made up of the phloem parenchyma, phloem fibers, sieve tube elements along with dead and living soft-walled cells. The outer phloem layer is made up dead cells, and the inner layer is made up of living cells. The two most important complex kind of tissue, constituting vascular bundles is the xylem and phloem. We discuss their role that xylem is responsible for transporting of water and other soluble materials in the plant in a unidirectional manner.
On the contrary, the role of phloem is to transport the food and other organic material produced by leaves through the process of photosynthesis.
Hence both the vascular tissues have their equal importance, which is necessary for the growth of the plants. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Key Differences Between Xylem and Phloem Given below are the important points which distinguish xylem with that of phloem: Xylem is the complex tissue of plants , responsible for transporting water and other soluble nutrients to the plants and the flow is unidirectional which is from root to the upper part of the plant, while on the other hand phloem is the another kind of the vascular, living tissue which is responsible for transporting food and other organic materials, prepared by the green parts of the plants like leaves.
The flow of material in phloem is bi-directional. Xylem mainly made up of dead cells and parenchyma is the only living cells present, whereas phloem mainly contains living cells and fibers are the only dead cells. Xylem is found in the center of the vascular bundle , deep in the plant and made up of xylem vessels, fiber, and tracheids, whereas phloem is found on the outer side of the vascular bundle and made up of phloem fibers, sieve tubes, sieve cells, phloem parenchyma and companion cells.
0コメント