NCERT Important Questions Class 9 Science biology Chapter 6
Important NCERT Extra Questions
Chapter 6 Tissues
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How many types of elements together make up the xylem tissue? Name them.
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Xylem is a complex tissue. It is made up of following four kinds of cells (= elements): (i) Tracheids; (ii) Vessels; (iii) Xylem parenchyma; (iv) Xylem fibres.
The components that make up xylem tissue, essential for water transport and support in plants:
1. Tracheary Elements:
– Tracheids: These elongated cells with tapered ends transport water and minerals in gymnosperms and various vascular plants.
– Vessel Elements: Shorter and wider cells with openings at their ends, forming vessels in angiosperms for more efficient water conduction.
2. Xylem Parenchyma: Living cells supporting xylem function by storing starch, oils, and providing nourishment to neighboring cells.
3. Xylem Fibers: Elongated cells with thick walls offering structural support to the xylem, contributing to plant stability and strength.
4. Xylem Ray Cells (Ray Parenchyma): Horizontal, thin-walled cells extending from the center of stems or roots, aiding lateral conduction of water and nutrients and providing storage capacity.
These elements collaborate within the xylem tissue, forming a network that efficiently transports water and nutrients from roots to the rest of the plant while offering mechanical support and storage capabilities.