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Plant Responses and Growth

Explore how plants respond to stimuli and hormones, including tropisms like thigmotropism, phototropism, and gravitropism, influenced by plant hormones such as auxin. Learn about plant life spans and growth processes.

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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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