Water transport Food transport

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Presentation transcript:

Water transport Food transport Transport in Plant Water transport Food transport

Root Pressure Capillary action Transpiration Water Transport Root Pressure Capillary action Transpiration

Root pressure Water is drawn in root by osmosis. Excess water is pushed into xylem by pressure. This pressure push water up in xylem.

Capillary Action Since the adhesive force between water molecules and tube materials is larger than cohesive force between water molecules, water column is pulled up by adhesive force.

Transpiration Stomata opened by guard cells. Water diffuse out through stomata. Water evaporate from cell wall to intercellular space. Water draw to surface cell from xylem by osmosis. Unbreakable water column pull up by leave. Water draw into xylem from root cell by pull. Water draw from soil to root cells.

Stomata Glucose increase

Water diffuse out Symplast, apoplast Diffusion evaporation

Xylem

Tracheid

Photo

In root

In Root

Water pathway

Casparian strip

Mature endodermis

Photo of young root

Model of transpiration

Potometer Not for rate of transpiration but for water absorption only. How can transpiration rate be determinated.

Increase water absorption Decrease water evaporation Plant in dry region Increase water absorption Decrease water evaporation

Transport of food in Phloem Criteria Energy required Occurred in sieve tubes Direction from leave to organs Up and down possible

Structure of phloem

Mass flow hypothesis Sucrose move to phloem from leave cell by active transport. Water potential in phloem decrease. Water move in phloem by osmosis. Water volume increase in phloem, turgid pressure increase. Sucrose remove from phloem at organ by active transport. Water potential in phloem increase. Water move out of phloem by osmosis. Pressure decrease. Water flow by pressure difference. Sucrose flow with water along phloem.

Model of translocation

Experiment