Phloem Structure and Function
The phloem tissue represents another excellent example of cell specialization, with unique adaptations for transporting dissolved sugars throughout the plant.
Definition: Phloem function involves the transport of dissolved sugars both upward and downward within the plant.
Example: The presence of sieve plates and companion cells demonstrates specialized cellular modifications for efficient sugar transport.
Highlight: Phloem vessel cells have limited cellular contents (no nucleus and minimal cytoplasm) to facilitate efficient sugar movement.
Vocabulary: Sieve plates - Porous end walls in phloem cells that allow for sugar transport.
The companion cells connected to phloem vessels contain mitochondria that provide energy for the transport process, showcasing the intricate relationship between different specialized cell types.
