Plant Responses and Adaptations 1

TROPHISMS TROPHISM PHOTOTROPHISM GRAVITROPHISM THIGMOTROPHISM Definition picture

Tropism a response of a plant to an environmental stimulus. What is a Tropism? Tropism a response of a plant to an environmental stimulus. “TRO-FIZZ-EM” 3

What is Phototrophism? “FO-TOE-TRO-FIZZ-EM” A tendency of plants to grow toward a source of light. 4

What is GRAVITROPHISM? “GRAV-EE-TRO-FIZZ-EM” A tendency of a plant to grow in a direction in response to the force of gravity. 5

What is Thigmotropism? “THIG-MO-TRO-FIZZ-EM” The response of plants to touch. 6

Plant Adaptations

Aquatic Plants have tissues with large air filled spaces oxygen diffuses through these tissues have floating seeds that delay germination grow quickly after germination growing shoot extends above water surface Water Lettuce Water lily 8

Desert Plants Have extensive roots, reduced leaves, and thick stems to help them survive. Lechugilla Cacti 9

Carnivorous Plants Live in bogs and wet or acidic places Trap food using special leaves Sundew Pitcher Plants Venus’ Flytrap