Plant Responses and Growth EQ: How do plants respond to stimuli

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/ gravitropism/gravi1/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 – 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?

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?