What is the difference between secondary xylem and secondary phloem?

Function in trees

Toward the inside are called secondary xylem, or wood, and those formed toward the outside of the cambium are called secondary phloem. The bark and the wood together constitute the secondary plant body of the tree.

Primary xylem is The xylem that is formed during the primary growth from procambium of apical meristems. It differs from the secondary xylem in a way that the secondary xylem forms as result of secondary growth. Primary growth in plants is a growth in length whereas secondary growth is a growth in diameter.

An increase in the height of stem and root due to apical meristem is the primary growth, whereas the increase in the girth due to lateral meristem is called secondary growth.

Definition. Primary meristem refers to a type of meristem involved in the primary growth and thus gives rise to the primary tissues of the plant while secondary meristem refers to a type of meristem involved in the secondary growth and thus gives rise to the secondary tissues of the plant.

In woody plants secondary xylem comprises The bulk of the tissue in the stems and roots. It is the most important supporting tissue in arborescent dicotyledons and most gymnosperms, and the major tissue for the transport of water and essential minerals in woody plants.

Xylem, plant vascular tissue that Conveys water And dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as tracheary elements.

The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients. The word xylem is derived from the Ancient Greek word ξύλον (xylon), meaning “wood”; the best-known xylem tissue is wood, though it is found throughout a plant.

Primary xylem (Figure 6) consists of lignified tracheary elements (tracheids and vessel elements), which are Dead at maturity (they have lost their protoplasts). Parenchyma cells also are interspersed throughout the tissue.

The secondary xylem provides additional structural support and additional water conduction tissue in shrubs and trees. The secondary phloem replaces the primary phloem. Similarly, as the trunk of a woody plant gets larger, the dermal tissue need to be expanded and replaced.

The inner layer of secondary xylem forms the Heartwood And the outer layer forms the sapwood. The sapwood contains young layers of the tree and it performs water conduction in large woody trees. Thus, the common name of wood is called secondary xylem. So, option B is the correct answer.

During growing season, Primary growth extend the shoots, and secondary growth thickens the parts that formed in previous years. During growing season, primary growth extend the shoots, and secondary growth thickens the parts that formed in previous years.

The four types of tissues in plants are Meristematic, vascular, ground and dermal tissue.

Tissues are Dermal, vascular, and ground tissues. Primary dermal tissues, called epidermis, make up the outer layer of all plant organs (e.g., stems, roots, leaves, flowers). They help deter excess water loss and invasion by insects and microorganisms.

Secondary xylem refers to the formation that occurs after the vascular cambium’s secondary growth. This type of xylem is not present in non-woody plants, but is commonly seen in Shrubs and trees.

Wood is the Secondary xylem Produced by coniferous gymnosperms (conifers) and by dicotyledonous angiosperms (flowering plants). Wood performs two main physiological functions: it conducts water from the roots to the leaves and it supports the branches and crown of trees and shrubs.

Cell division by the cambium Produces cells that become secondary xylem and phloem. As secondary phloem and xylem tissue accumulates, it both increases the girth of the stem and forms wood and bark.

The main function of the xylem tissue in plants is to Conduct water and minerals from root to the leaf. Furthermore, the primary xylem consists of protoxylem and metaxylem while secondary xylem occurs inside the bark, which is the outermost protective layer of a plant that has undergone secondary growth.

Primary xylem forms from the procambium of apical meristems during the primary growth. There are Four Types of xylem cells in the primary xylem. They are the xylem tracheids, xylem vessels, xylem parenchyma and the xylem fibres.

The correct answer is (D) Xylem Parenchyma. Xylem is a type of vascular tissue present in plants, which primarily transports water and nutrients from roots to stem and leaves. Xylem parenchyma is the only living cell of the xylem.

The end walls may have perforations. The presence of perforation plate distinguishes xylem vessels from tracheids. The typical length of xylem vessel is 10 cm. However, a typical vessel member is shorter than a tracheid cell.

Secondary phloem is A type of phloem that forms from the vascular cambium during the secondary growth. The secondary growth is responsible for growth in girth in plants particularly trees. Secondary xylem and phloem in dicot stem are produced by vascular cambium.

The main function of secondary phloem is to Transport nutrients throughout the tree or woody plant. As the vascular cambium produces more secondary xylem, the older, more exterior portions of the secondary phloem are crushed. They die, and are sloughed off as part of the bark.