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Plant Responses and Growth

Plant Responses and Growth. EQ: How do plants respond to stimuli and hormones?. EQ: How do plants respond to stimuli and hormones?. Tropisms. A plant’s growth response toward or away from a stimulus Thigmotropism - Touch Phototropism - Light Gravitropism - Gravity. Positive Tropism.

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Plant Responses and Growth

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  1. Plant Responses and Growth EQ: How do plants respond to stimuli and hormones?

  2. EQ: How do plants respond to stimuli and hormones? Tropisms • A plant’s growth response toward or away from a stimulus • Thigmotropism - Touch • Phototropism - Light • Gravitropism - Gravity

  3. Positive Tropism • A plant growing toward a stimulus EQ: How do plants respond to stimuli and hormones?

  4. Negative Tropism • A plant growing away from a stimulus http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/gravitropism/gravi1/gravitrop.html EQ: How do plants respond to stimuli and hormones?

  5. Plant Hormones • Hormone – a chemical that affects how a plant grows and develops • Control tropisms • Germination • Formation of plant parts • Shedding of leaves • Development of fruit EQ: How do plants respond to stimuli and hormones?

  6. Plant Hormones • Auxin – • Speeds up plant growth • Controls plant’s response to light EQ: How do plants respond to stimuli and hormones?

  7. Life Spans of Angiosperms • Annuals – flowering plants that grow, flower and die in a single year • Biennials – complete life cycle in two years • 1st year germinate, grow roots and very short stems and leaves • 2nd year grow new stems and leaves, produce fruit • Perennials – live longer than two years EQ: How do plants respond to stimuli and hormones?

  8. Class Work and Homework • Fill In • What did I learn • Confused • Say Read pages A164 – A166 Questions 1-4 A 166 EQ: How do plants respond to stimuli and hormones?

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