Translocation

Recall the main funtion of a phloem cell.

• To transport organic molecules (mainly sucrose) to different parts of a plant.

• To transport water to different parts of a plant.

• To make energy for the plant via photosynthesis.

• To provide structural support to a plant.

Recall which of the following form part of the phloem.

• Sieve-tube elements

• Trachieds

• Vessels

• Companion cells

The process by which organic molecules and some mineral ions are transported in plants

• Translocation

• Transpiration stream

• Evaporation

• Respiration

Cells which transport assimilates in the plant are called ..........?

• Inorganic

• sieve elements

• key elements

• phloem elements

What is the most abudant solute in phloem sap?

• amino acids

• hormones

• sucrose

• minerals

What is the best words to describe sugar source and sugar sink

• Both are plants organ and act as storage

• Sugar sink can be either roots, fruit or mature leaves and sugar source is shoots

• Sugar source act as site for sugar production and sugar sink will store sugar

• Companion tube carry food from a sugar source to a sugar sink

Movement of sugar from source to other parts of plant is acheieved through...?

• active transport

• diffusion

• mass flow

• capillary action

All events below occurs in sink tissue, except

• Water potential increases

• Water enters sieve elements from xylem by osmosis

• Higher(+ve) solute potential

• Phloem turgor pressure decrease

Method of cell transport used to transport sucrose from companion cells in to the sieve tube elements

• Diffusion

• Facilitated diffusion

• Active transport

• Co-transport

Movement of sucrose in the sieve tubes is due to

• mass flow down a hydrostatic gradient in the sieve tubes

• mass flow down a concentration gradient in sieve tubes

• mass flow down a hydrostatic gradient in the xylem

• mass flow down a hydrostatic gradient in the phloem