TROPISM NEXT. . There are three main types of tropisms : Phototropism Geotropism Hydrotropism TROPISM refers to plant growth in response to something.

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Presentation transcript:

TROPISM NEXT

. There are three main types of tropisms : Phototropism Geotropism Hydrotropism TROPISM refers to plant growth in response to something in its surroundings.

GEOTROPISM Geotropism is the growth of a plant in response to gravity. Positive Geotropism Plant grows down with gravity. Ex. roots growing down Negative Geotropism is the growth of a plant opposite to the pull of gravity Ex. stems grow up NEXT Positive Geotropism Negative Geotropism * Geo means earth.

IMPORTANCE OF GEOTROPISM NEXT Pulls roots down to anchor a plant Roots can get needed water and minerals if they stay in the soil

PHOTOTROPISM Plant growth toward a source of light is PHOTOTROPISM. NEXT (“Photo” – light) Ex. Stems growing toward the window to get to the light

IMPORTANCE OF PHOTOTROPISM NEXT Lets leaves be in the best position possible to receive enough light for photosynthesis s/Gravitropismwlight.jpg

Hydrotropism Hydro means water. Hydrotropism refers to a plant growing toward a source of water. This allows the plant to stay alive and to do photosynthesis.