Ch 13-3: Plant Development and Responses

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Presentation transcript:

Ch 13-3: Plant Development and Responses Stimulus: anything that causes a reaction or change in an organism or any part of an organism. Tropism: growth of all or part of an organism in response to an external stimulus, such as light.

Hormone: chemical that causes cells to react in certain ways Hormone: chemical that causes cells to react in certain ways. Growth: process of increasing in size. Development: process that an organism goes thru as it increases in ability or skill.

Phototropism: change in the direction of plant growth in response to light. Gravitropism: change in the direction of plant growth in response to gravity.

If a plant gets light from only one direction, the shoot will likely…… Grow toward the light source. *Plant cells can differentiate many times thruout a plant’s life.