Bisc101 Questions Week7

Bisc101 Questions Week7 - 1. What are the structure and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1. What are the structure and functions of xylem and phloem? Answer: Xylem and phloem tissue occur together in a vascular bundle (Stele). The xylem takes water and soluble mineral nutrients from the root and distributes it throughout the plant. The structure of xylem is well suited for water transport. Xylem consists of two types of cells (i) tracheids and (ii) vessel elements . The cells are elongated, dead and “empty” therefore, offer a low resistance pathway for water movement. Vessels elements are wider and longer than tracheids. Watermtransport in Xylem transportat is mostly apoplastic. The flow af Xylem sap is driven by pressure gradients. You may have noticed the exudation of sap from a cut surface or leaves of a plant. This is due to root pressure that is generated when ions are pumped into the stele lowering the water potential resulting in flow of water from the soil to the stele. Phloem transports dissolved solutes throughout the plant and this process is called
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Bisc101 Questions Week7 - 1. What are the structure and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online