Tropisms To turn toward or away from a stimulus. Toward is positive Away is negative

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Presentation transcript:

Tropisms To turn toward or away from a stimulus. Toward is positive Away is negative growth.html

Geotropism (Gravitropism)  Plant growth toward or away from Earth or (gravity).  Roots grow down for anchorage 

Chemotropisms  Plant growth toward or away from chemicals.  Roots grow toward useful minerals and grow away from harmful minerals.

Phototropism  Plant growth toward or away from the light. phototropism experiment DQ/view HD: computer enhanced

Thermotropism  Plant response due to heat.

Thigmotropism  Plant growth and movement in response to touch.  Vines will use thigmotropism to grab on for support to carry out phototropism in search for light.  Mimosa plants respond to touch for protection.  

Hydrotropism  Plant growth toward water.

Hydrotropism  Necessary for TURGOR PRESSURE – water pressure inside plant cells that allow the plant to stand tall.

Tropism review  _TWg5Ik _TWg5Ik  rmUP5ZM rmUP5ZM

Xylem of-transpiration-and-cohesion-on-function.html  Vessels in a plant that bring water and nutrients up the stem of a plant and to the leaves.