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BIO: TOPIC 9 - Coggle Diagram
BIO: TOPIC 9
Topic 9.1
Transpiration
Water transportation from roots to leaves
Photosynthesis -> transpiration
Properties of water
Cohension
Adhesion
Structure of Xylem
Dead cells
Pits
Thick cell walls
Vessel elements and tracheids
Active uptake of minerals
Proton H+ exit the roots
Protons bind mineral ions
Mineral ions are then re-absorbed
Water then transported by osmosis via aquaporins (symplastic and apolastic)
Potometer
Topic 9.2
Translocation
Material exchange from source to sink
Source: materials are synthesized (leaves)
Sink: materials are delivered to (root and seed)
Strucutre of phloem
Sieve element cells
Mitochondria
No nuclei (maximise SA:Vol ratio)
Rigid cell wall
Companion cells
Unloading and loading materials in source and sink
Infolding plasma membrane
Mitochondria
transport protein
Active transport
Phloem sieve tubes pump proton ions
Forming gradient
Forcing transportation of co-transport protein (protein and sucrose)
Materials exchange source and sink
Source
Materials are transported phloem (hypotonic)
Water are drawn from xylem
Hydrostatic pressure pushes sap in phloem to sink
Sink
Environment is hypotonic -> water is drawn back to xylem
How materials are processed
Storage
Metabolism