L16 plant reproduction

L16 plant reproduction - • Pollination triggers fruit...

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Chapter 39 Lecture Guide Plant Reproduction Organs of a Flower Variations in Flower Organs a. Simple-single ovary of one flower b. Aggregate-many ovaries of one flower c. Multiple-many ovaries of many flowers Reproductive Variations d. Monoecious-carpel and stamen in one plant e. Dioecious- carpel and stamin in different plants Alternation of Generations Males-microspores females- megaspores Gametophytes Male: 1 egg sperm zygote
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Chapter 39 Lecture Guide Female: Pollen Tube Growth 2
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Chapter 39 Lecture Guide Embryo Development Seed Structure Seed Types Seed Coat surrounds endosperm and embryo Endosperm remains as a food source in monocots and some dicots after germination In most dicots, endosperm nutrients are transferred to the cotyledons (seed leaves)
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Unformatted text preview: • Pollination triggers fruit formation • Flower is shed as ovary grows • Forms a pericarp (thickened wall of fruit) 3 Chapter 39 Lecture Guide • Fruit ripening mechanism • Happens as seeds are completing development • Complex interaction of hormones • Entice animals – Color – Smell – Softness – Sugar content (up to 20%) – Wheat, rice, maize, other grasses Seed Germination • Seed dormancy: arrested growth and development • Dehydration, lowered metabolic rate • Length of time variable • Forms a pericarp (thickened wall of fruit) • Germination depends on: • Favorable conditions, environmental cues – Fire – Substantial rainfall – Harsh winters – Exposure to light Summary: 4...
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L16 plant reproduction - • Pollination triggers fruit...

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