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Plant Growth and Development

Plant Growth and Development. Mrs. Molloy’s Science Class DRMS – 6 th Grade. Growth and Development. Growth and development are necessary for plants to survive Growth is an increase in the number, size, and volume of the plant’s cells Development is the emergence of specialized, parts

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Plant Growth and Development

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  1. Plant Growth and Development Mrs. Molloy’s Science Class DRMS – 6th Grade

  2. Growth and Development • Growth and development are necessary for plants to survive • Growth is an increase in the number, size, and volume of the plant’s cells • Development is the emergence of specialized, parts • Roots • Leaves • Flowers

  3. Germination • Seeds need certain environmental conditions to "start to grow“ or germinate. • Environmental conditions in the Spring cause a seed that has been “sleeping” all Winter to germinate • Increased rain • Increased temperatures • Increased hours of daylight

  4. Photoperiodism • Photoperiodism is a response to changes in the length of the day • Long-day plants: flower in the spring when day length is longer • Short-day plants: flower in late summer or early autumn when day length is shorter

  5. Hormones • Hormones are chemicals that act like messengers; they “tell” the plant to grow • Decrease of daylight hours trigger the reduction of auxin (hormone) and the plant stops growing

  6. Dormancy • Dormancy is a period in a plant’s life cycle when growth and development are temporarily stopped • Dormancy occurs in autumn when there are shorter days, colder nights, and less rain

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