Plant Responses, Growth, & Import
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Transcript of Plant Responses, Growth, & Import
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Chapter 3 Lessons 5 & 6
*Plant Responses, Growth, & Import
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*What are the stimuli that
produce plant
responses?
1. Tropism – a plant’s growth in response to a stimulus*Positive tropism – growth is toward the
stimulus*Ex. Plant growing toward the light
(phototropism)*Negative tropism – growth is away from the
stimulus*Ex. Plant growing away from gravity
(gravitropism)
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*How do plants respond to Seasonal
Changes?
1. Photoperiodism*Short day plants – flower when the days are
short*Long day plants – flower when the days are
long2. Dormancy*Helps plants survive freezing temperatures
and the lack of liquid water*Ex. Deciduous trees – drop their leaves
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*How are plants important to everyday
life?
1. Environment*Habitats for animals, food, oxygen, clean
water, hold soil in place
2. Humans*Food, clothing, building materials, fuel