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Similar to Unit 4, Lesson 4.4 - The Seed
Unit 4, Lesson 4.4 - The Seed
- 1. The Seed Unit Four,Lesson 4.4 By Margielene D. Judan
- 2. Lesson Outline TheSeed Parts of a Seed Factors Affecting Seed Germination
- 3. The Seed Afertilized ovule
- 4. Parts of aSeed Seed coat Endosperm – food store Embryo – the baby plant
- 5. Seed coat Protectsthe seed Consists of 2 layers 1. Tegmen (inner; colorless) 2. Testa (outer; colored) A scar called hilum can be seen. It’s the mark left by the funiculus that attaches the ovule to the ovary
- 6. Endosperm Stores food Nourishes the seed
- 7. Embryo The miniature(baby) plant Dominant (not active) until some requirements (ex. Water, sunlight) are met Has two basic parts: hypocotyl and epicotyl
- 8. Embryo Epicotyl –will become shoot (leaves and stems) via plumule; grows above plant axis Hypocotyl – connection between cotyledon (seed leaf) and radicle (baby root); grows below plant axis
- 9. Seed Germination Theprocess in which the embryonic plant contained within the seed grows. The first to emerge is the hypocotyl, then the epicotyl. A young plant called seedling is now seen.
- 10. Factors Affecting SeedGermination Water - causes seeds to swell and break open; when H2O enters, it activates enzyme and the food is broken down to useful chemicals for the new plant Oxygen – for cellular metabolism; when the seed breaks open, gas exchange can occur Temperature – each plant species has a temperature range within which the seeds will germinate
- 11. Seed Germination Asthe seedling emerges from the seed coat sending out roots and leaves, the stored food is exhausted (used up). The leaves by this time provides its own food by photosynthesis.
- 12. Seed Germination Whenthese factors (water, oxygen, temperature) are met, the seed could germinate into a new plant.
- 14. Assignment: Coupon Bond ArtConnection: Refer to p. 141 Deadline: in two days
- 15.