Transport in Plants

Plants require:

CO2

Light

O2

H2O

Minerals

Macronutrients (besides C, H, O) Ca, K, Mg, N, P, S

Micronutrients B, Cl, Cu, Fe, Mn, Mo, Ni, Zn

Sugar

Water goes up the Xylem

From root To leaf then Transpires

Sugar madeIn the leaf

Goes down The Phloem

How do roots absorb water and minerals?

How does xylem transport xylem sap?

Nearly all of the energy to drive

the process comes from the

sun

Unbroken chains of water

molecules fill xylem vessels

Evaporation at the top

pulls water up from the

bottom

How does xylem transport xylem sap?

Water vapor escapes through stomata

How does phloem transport phloem sap?

Food (sugars) are then moved from leaves to the rest of the plant

Not all herbivores chew leaves…Some exploit sap

E.g., aphids tap sieve-tube

elements for phloem sap

Summary

• Xylem is

H/W

• P97• Q 3,5,7,8.