unit 6 lesson 3 how do plants respond to their environment? copyright © houghton mifflin harcourt...
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Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Florida Benchmarks
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• SC.3.N.1.6 Infer based on observation.
• SC.3.L.14.2 Investigate and describe how plants respond to stimuli (heat, light, gravity), such as the way plant stems grow toward light and their roots grow downward in response to gravity.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Plants and Light
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• The environment is all the living and nonliving things in a place.
• Plants respond to their environments.
• One way that plants respond to their environment is by growing toward light. Growing toward light helps plants make more food.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Plants and Light
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• Flowering plants respond to light in more than one way.
• Some flowers open during the day and close at night. Other flowers close during the day and open at night
• Sunflowers follow the sun as it moves across the sky.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
The Heat Is On!
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• Plants respond to the temperature of their environment.
• Leaf budding is one way that plants respond to temperature.
• When the weather is warm, the buds come out.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
The Heat Is On!
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• Temperature affects when seeds germinate. Germinate means that the seeds start to grow.
• Some plants germinate when the weather is warm.
• Some pinecones do not release their seeds until after a forest fire.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Cold Snap
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• Plants respond to cold weather. Temperature below 0 °C, or a freeze, can harm a plant.
• If a freeze occurs when the plant is flowering, the flowers die. The plant does not produce fruit.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Cold Snap
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• If a freeze occurs when fruit is on the plant, the fruit is ruined.
• Sometimes, the fruit can be saved by spraying it with water. Ice forms on the fruit and protects it.
Unit 6 Lesson 3 How Do Plants Respond to Their Environment?
Up or Down?
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• Plants respond to gravity.
• A plant’s roots grow downward, and its stem grows upward in response to gravity.
• Even if you tip a plant on its side, its stem will grow up and its roots will grow down.