PLANT TROPISM.

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Presentation transcript:

PLANT TROPISM

Objectives Identify tropisms in plants. Examine effects of tropisms in plants. Recall differences in tropisms and effects of tropisms in plants.

What is Tropism? A growth movement whose direction is determined by the direction of the stimulus. Tropisms cause a change in growth pattern.

Two Types of Tropisms 1. Positive Tropism 2. Negative Tropism

Grows in the direction from which the stimulus originates . Positive Tropism Grows in the direction from which the stimulus originates . Growth toward the sun is a Positive Phototropism

Negative Tropisms Growth away from gravity is a Negative Geotropism Growth away from the stimulus. Growth away from gravity is a Negative Geotropism

http://www.cccmkc.edu.hk/~sbj-biology/AL%20BIO/Continuity%20of%20life%20growth%20and%20development/Growth%20and%20development_image/Tropism_image/Phototropism%20in%20mung%20bean%20seedling.jpg

4 TYPES OF TROPISMS Phototropism Geotropism (Gravitropism) Hydrotropism Thigmotropism

PHOTOTROPISM Response to light

GEOTROPISM or GRAVITROPISM Response to gravity

HYDROTROPISM Response to water

THIGMOTROPISM Response to touch

Summary 4 Types of Tropisms What is a tropism? A growth movement towards a stimulus. 4 Types of Tropisms Phototropism-growth toward light. Geotropism-growth due to gravity. Hydrotropism-growth toward water. Thigmotropism -growth due to touch.