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chapter 3 lesson 4
1st period jack notecards
| Term | Definition |
|---|---|
| Tropism | The response of a plant toward or away from a stimulus |
| hormone | A chemical that affects growth of development. The chemical product of an endocrine gland. |
| photoperiodism | A plant response to seasonal changes in the length of night and day |
| critical night length | The number of hours of darkness that determines whether or not a plant will flower |
| dormancy | A period of time when an organisms growth or activity stops |
| List three stimuli that produce plant responses | Light gravity and touch |
| Give an example of both positive and negative tropism | light (phototropism) and gravity plant shoots exhibit positive phototropism (growing towards light) and negative gravitropism (growing away from gravity), while roots show positive gravitropism (growing down with gravity) and negative phototropism (growin |
| Describe what true is a plant to flower? | A flower is the specialized reproductive part of a larger plant, serving as the organ for sexual reproduction to create seeds and fruits, while the plant itself is the whole organism (roots, stem, leaves, flowers) that performs life functions like photosy |
| why is dormancy important | Dormancy is crucial for survival, allowing plants (and some animals) to conserve energy, water, and nutrients during harsh conditions like winter or drought by slowing metabolism, protecting tissues from damage (like freezing), and synchronizing growth fo |
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