Back

Translocation

 
4.3 Translocation
 
Definition of Translocation
A process of transporting organic substances such as sucrose, amino acids and hormones in the phloem from the leaves to other parts of the plant such as the roots and stem.
 
The image is an educational graphic explaining the necessity of translocation in plants. It is divided into two sections: 1. The first section states that translocation involves transporting sucrose, a photosynthetic product, from leaves to other parts of the plant for metabolism and storage. 2. The second section mentions that translocation also involves transporting other organic substances such as amino acids and other organic acids from shoots to other parts of the plant for metabolism and storage. The background is light with a logo at the bottom right corner labeled ‘Pandai.’
 
Pathways of Translocation in Plants Explaination

This image illustrates the process of phloem transport in plants. It shows how sucrose is moved from a leaf cell (1) into a companion cell and then into a sieve tube (2). Water (H2O) enters the sieve tube from the xylem (3), creating pressure that drives the flow of sucrose and water through the sieve tube (4). The sucrose is transported to a sink cell, such as a root or fruit cell (5), where it is unloaded. Water then exits the sieve tube and returns to the xylem (6), completing the cycle (7).
  1. Sucrose is actively transported into the sieve tube.
  2. The transport of sucrose into the sieve tube through the companion cell from the leaf cells reduces the water potential in the sieve tube. This causes water to diffuse from the xylem into the sieve tube via osmosis.
  3. The water diffusion increases the hydrostatic pressure in the sieve tube.
  4. The increase in the hydrostatic pressure causes the phloem sap to be pushed along the sieve tube to other organs of the plant.
  5. The phloem sap (sucrose) is transported from the sieve tube to other parts such as stems, roots, shoots, fruits and tubers by active transport.
  6. The high water potential in the phloem causes the water to diffuse in order for it to return into the xylem by osmosis.
  7. Transpiration pulls water along the xylem vessel against the direction of gravitational pull.
 
Mesophyll Cells have Chloroplast and Carry Out Photosynthesis
  • Photosynthetic products are transported actively into sieve tube by companion cell.
  • The accumulation organic substances in phloem increases the concentration gradient,then water diffuses from surrounding into phloem.
  • Hydrostatic pressure generated transports organic substances to other parts.
  • At other parts of plant such as root,the organic substances in phloem are transported actively into root cell for metabolism and storage.
 

 

 

 

The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of Pandai.
Chapter : Transportation in Plants
Topic : Translocation
Form 5 Biology
Related notes

Report this note
MY
EN