Chapter 37 - in place 6 Dormancy = additional conditions...

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Chapter 37 Vegetative plant development I. Food Storage of Seed Providing nutrition is an evolutionary trend towards increasing survival of the embryo 1. Endosperm = food source for developing embryo This is important for development until the leaves emerge II. Importance of Seeds 1. Seeds are dormant during unfavorable conditions a. development of plant is arrested after differentiation of cotyledons and meristems b. outer cell layers of ovule develop into seed coat (impermeable) 2. Seeds protect embryo at a vulnerable stage of development 3. Seeds contain stored food for plants to develop 4. Seeds are adapted for dispersal and can remain viable for hundreds of years Dormancy must be broken before germination will proceed 5. Germination a. seed absorbs water and metabolism resumes b. absorption of water causes cells to swell and splits seed coat c. if dormancy is broken enzymes are produced to digest endosperm, O 2 required d. Mitosis begins, root usually develops first to anchor developing plant
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Unformatted text preview: in place 6. Dormancy = additional conditions that have to occur before plants will germinate a. stratification = most common = cold treatment b. light of proper wavelength/ depth in soil c. chemical = fire adaptation III. Fruits Fruits = mature ovaries (carpels) During seed formation the ovary develops into a fruit 1. Dry fruits - carpels tissues harden and dry, often split exposing seeds Examples of dry fruits Follicles, Pods, Samaras, Achenes (sunflower seeds) 2. Fleshy fruits – often designed to be eaten Fruit sugars and other tissues provide no nourishment for the seed Examples of fleshy fruits Pomes (apples), drupes, aggregates, Berries 3. Fruit dispersal – fruits are designed to disperse seeds fleshy fruits a. carried away and eaten b. eaten on the spot and pooped elsewhere Dry fruits a. blown by wind b. attach to animals c. float in water d. buried by animals...
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Chapter 37 - in place 6 Dormancy = additional conditions...

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