| Term | Definition |
|---|
| environments | Plants can react to changes in their _____________ in many different ways. |
| stimulus | Something in the environment that causes a living thing to react is called a(n) _____________. |
| tropism | The response of a plant to a stimulus is called _______________. |
| pattern | A plant reacts to a stimulus by changing it direction or ____________ of growth. |
| light | One tropism is plant stems that grow upward toward a source of ___________. |
| gravity | Plant roots grow downward because of the pull of ______________. |
| tips | Darwin found that there was something in the ____________ of plants that caused a tropism to light. |
| adaptations | Plants have _______________ that helps them survive in different environments. |
| water | A desert cactus has adaptations for saving ______________. |
| thick | A desert cactus has adaptations for saving water, such as spongy tissue and a very ___________, waxy cover. |
| cold winter air | Some trees lose their leaves every winter because ___________ can harm the leaves. |
| food | Trees that lose their leaves cannot make ____________. |
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