Plant Responses and Growth EQ How do plants

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

Negative Tropism • A plant growing away from a stimulus http: //plantsinmotion. bio. indiana. edu /plantmotion/movements/tropism/gra vitropism/gravi 1/gravitrop. html EQ: How do plants respond to stimuli and hormones?

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?

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

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

Class Work and Homework • Fill In – What did I learn – Confused – Say Read pages A 164 – A 166 Questions 1 -4 A 166 EQ: How do plants respond to stimuli and hormones?