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Dormancy & Seasonal Growth Cycles

Dormancy & Seasonal Growth Cycles. Annuals Biennials Perennials. Dormancy. Period of time when the growth or activity of a plant or seed stops due to changes in temperature or amount of water Dormancy allows various species to survive in particular environments. Seasonal G rowth Cycles.

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Dormancy & Seasonal Growth Cycles

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  1. Dormancy & Seasonal Growth Cycles Annuals Biennials Perennials

  2. Dormancy • Period of time when the growth or activity of a plant or seed stops due to changes in temperature or amount of water • Dormancy allows various species to survive in particular environments.

  3. Seasonal Growth Cycles • Determined by: • Where plants live • How they reproduce • Roles they play in their environment • Influences • Temperature • Amount of water • Amount of daylight

  4. Annuals

  5. Annuals • Once per year – whole life cycle in one season • Needs to be replanted the next year • Seeds are the dormant form • Examples: • Many weeds • Vegetables • Grains • Wild Flowers

  6. Biennials

  7. Biennials • Every two years • Entire life cycle in two years • Year one – roots, stems, leaves • Year two – flowers and seeds • Examples: • Carrots • Foxglove • Parsley

  8. Perennials

  9. Perennials • Do not die every year or every other year • Persist for many growing seasons • Herbacious • Herbs such as coneflower and basil • Woody • Deciduous – loose leaves all at once (Autumn) • Conifers/Evergreens – loose needles, but not all at once

  10. Dormancy Restated

  11. Perennials - Dormancy • Seasonal Changes in Trees to survive the winter. All trees lose their leaves at some point. Stop taking in water so the xylem will not freeze. • Trees like pines and holly lose their leaves/needles all through out the year.

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