WebThe xylem. transports water and minerals from the roots up the plant stem and into the leaves. ... One or more companion cells attached to each sieve tube provide this energy. A … WebSieve tube Sieve tube cells or sieve tube elements Elongated, thin walled LIVING cells Cells separated by sieve plates Cross walls that are perforated with pores = sieve Sucrose is loaded into the sieve tube by active transport. Sieve tube cell Sieve plate. Xylem Sieve tube cells Mature sieve-tubes has thin lining of cytoplasm. Nucleus, central ...
3.6.5 The Sucrose Loading Mechanism - Save My Exams
Web6 Jun 2024 · 3) Concentration of sucrose molecules build up in the companion cells, and it diffuses into the phloem (sieve tube element) via the plasmodesmata. 4) The sucrose … WebOnce the sugars are in the companion cell, they move to the sieve-member cells via diffusion. This creates an accumulation of sugar molecules in the sieve tube near the … اسعار cic
The man-eaters and other odd people. by Capt. Mayne Reid
WebSugar molecules are actively loaded into the transport tissue. Describe how active loading takes place. ... 7 by facilitated diffusion ; 8 sucrose / sugar, diffuses into sieve tube ... Web24 Sucrose is loaded into companion cells and phloem sieve tube elements by active transport and diffusion using transport proteins and plasmodesmata. Which row shows how sucrose is loaded? active transport diffusion transport proteins plasmodesmata A into companion cell into phloem sieve tube element into companion cell Websieve tube elements [37]. These elements are joined end to end into sieve tubes, and are associated with parenchymatic, nucleated cells, the companion cells, an important role of which is to load sucrose into the sieve tubes. The sieve tube elements are living cells, which become enucleated at maturity. The sieve plates are cravings jedburg