Geotropism Charlie Haffey Norwood Public Schools.

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Presentation transcript:

Geotropism Charlie Haffey Norwood Public Schools

Geo- the Earth or gravity tropism- a response or a reaction What does that mean?

Positive Geotropism Parts of the plant grow towards gravity Usually seen in roots

Negative Geotropism Parts of the plant grow away from gravity Usually seen in stems

How does this happen? Caused by plant chemicals called hormones. Hormones move in the plant in response to gravity. Hormones change the direction of plant growth.

A plant starts to grow

Turn the plant 90 o

Stems grow up ( - geotropism) Roots grow down ( + geotropism)

credit

Geotropism Charlie Haffey Norwood Public Schools