Unit 6 Lesson 3 How Do Plants Respond
- Slides: 9
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 • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? Plants and Light • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? Plants and Light • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? The Heat Is On! • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? The Heat Is On! • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? Cold Snap • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? Cold Snap • 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. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 6 Lesson 3 How Do Plants Respond to Their Environment? Up or Down? • 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. Copyright © Houghton Mifflin Harcourt Publishing Company