Biology Plant Responses.

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Presentation transcript:

Biology Plant Responses

What is a tropism? water light gravity Tropism is a when a plant changes its growth in response to a stimulus (a change in their environment) water light gravity

How do plants respond to light? A plant’s response to light is called phototropism. light Plants grow towards light, Why do plants grow towards light? Plants need light for photosynthesis, so they respond to light by growing towards it.

How do plants always grow the right way up? What conditions will affect how a plant grows?

Geotropism shoots grow up (against gravity) gravity roots grow down A plant’s response to gravity is called a geotropism. Different parts of a plant have different responses to gravity. shoots grow up (against gravity) This allows them to get light for photosynthesis gravity roots grow down (with gravity) This allows them to get water from the soil

Test yourself… What is a tropism Explain what the word stimulus means Describe what phototropism is, how is works and why Describe what geotropism is, how is works and why.

What do different tropisms mean?