Example for sugar sucrose.

• Stems
• Growing roots
• Mature leaves
• Fruits

Definition of sugar sink is an organ that is a net consumer or depository of sugar

ATP used in the process are supplied by

• Companion cell
• Leaf cell
• Root cell
• Xylem

Sucrose is loaded from source cell into sieve tube via

• Osmosis
• Active transport
• Passive transport
• Hydrostatic pressure

Loading of sucrose into the sieve tube at the source cell reduces water potential inside the sieve tube.

During loading of sucrose, water diffuse from (i) to (ii) by osmosis.

• (i) adjacent xylem, (ii) sieve tube
• (i) companion cell, (ii) adjacent xylem
• (i) adjacent xylem, (ii) companion cell
• (i) sieve tube, (ii) companion cell

Water generates a (i) that forces sucrose to flow along the sieve tube to the sink cell.

• (i) Negative pressure
• (i) Low hydrostatic pressure
• (i) Hydrostatic pressure
• (i) High hydrostatic pressure

During lower concentration of sucrose in sink cell, sucrose is unloaded from the sieve tube via

• Osmosis
• Active transport
• Passive transport
• Hydrostatic pressure

If the concentration of sucrose in sink cell is higher, sucrose is unloaded via

• Osmosis
• Active transport
• Passive transport
• Hydrostatic pressure

Unloading of sucrose from sieve tube to the sink cell decreases the water potential in the sieve tube.