Tropism We will: Describe the effects of external stimuli on plant growth and development You will: Identify the types of tropisms exhibited by plants.

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Presentation transcript:

Tropism We will: Describe the effects of external stimuli on plant growth and development You will: Identify the types of tropisms exhibited by plants

Definition Tropisms occur when plants respond to external stimuli. Tropisms are movements caused by a change in the plant’s growth pattern. Tropism comes from the Greek word meaning “turning”

Vocabulary -tropism turning Photo- phototropism Graviti- gravitropism Word Meaning -tropism turning Photo- phototropism Graviti- gravitropism Thigmo Thigmotropism Hydro- hydrotropism

-tropism turning Photo- phototropism light Graviti- gravitropism Word Meaning -tropism turning Photo- phototropism light Graviti- gravitropism Thigmo Thigmotropism Hydro- hydrotropism

-tropism turning Photo- phototropism light Graviti- gravitropism Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Thigmo Thigmotropism Hydro- hydrotropism

-tropism turning Photo- phototropism light Graviti- gravitropism Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity Thigmo Thigmotropism Hydro- hydrotropism

-turning due to gravity Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity -turning due to gravity Thigmo Thigmotropism Hydro- hydrotropism

-turning due to gravity Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity -turning due to gravity Thigmo Thigmotropism Touch Hydro- hydrotropism

-turning due to gravity Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity -turning due to gravity Thigmo Thigmotropism Touch -turning due to touch Hydro- hydrotropism

-turning due to gravity Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity -turning due to gravity Thigmo Thigmotropism Touch -turning due to touch Hydro- hydrotropism Water

-turning due to gravity Word Meaning -tropism turning Photo- phototropism light -turning due to light Graviti- gravitropism Gravity -turning due to gravity Thigmo Thigmotropism Touch -turning due to touch Hydro- hydrotropism Water -turning due to water

Positive or Negative A tropism is positive if the affected plant part grows toward the stimulus. A tropism is negative if the plant part grows away from the stimulus. Example: Plant is…. Negative gravitropism Positive phototropism

Phototropism https://www.youtube.com/watch?v=zHe7y8cy-7Y http://www.youtube.com/watch?v=F3Oj2er-91

Gravitropism (Geotropism) http://www.youtube.com/watch?feature=endscreen&NR=1&v=mYZXax8V_L0

Thigmotropism http://www.youtube.com/watch?v=yMHmU3eZsYk Stop video at 1:30 http://www.youtube.com/watch?v=Zq3U uHlPLQU

Venus Fly Trap The Venus Fly Trap closes when the leaves are touched. This is an example of thigmotropism. https://www.youtube.com/watch?v=ktIGVtKdgwo

Deadly Plants https://www.youtube.com/watch?v=RmzbQsIdaFw

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