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Plant Reproduction: From Life Cycle to Seed Germination

Explore the fascinating world of plant reproduction, from alternation of generations to seed germination, and learn about key stages like sporophyte and gametophyte. Dive into the processes of fruit formation and vegetation propagation. Discover the intricate flower structure and the double fertilization phenomenon, essential to the life cycle of flowering plants. Witness the magic of seed germination, where a new plant emerges from dormancy. Unravel the mysteries of plant growth and reproduction in this insightful journey.

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Plant Reproduction: From Life Cycle to Seed Germination

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  1. Unit 7Chapter 24Reproduction in Plants

  2. Alternation of generations • The basic life cycle pattern for most plants • Sporophyte stage • Diploid, asexual, produces spores • Gametophyte stage • Haploid, sexual, produces gametes

  3. Vegetation Propagation • A type of asexual reproduction where a new plant is produced from existing plant organs or parts • Ex: plant “cuttings”

  4. Life cycle of Mosses

  5. Moss life cycle Click on image to play video.

  6. Life cycle of Ferns

  7. Life cycle of Conifers

  8. Gymnosperm life cycle Click on image to play video.

  9. Flower structure • Petals • Colorful, to attract pollinators • Sepals • Leaflike, to protect inner organs • Stamen (male organ) • Contains anther, produces pollen • Pistil (female organ) • Contains ovary, produces eggs

  10. Life cycle of a flowering plant • Double fertilization • One sperm joins the egg, while the other joins the central cell, forming the endosperm • Endosperm • Food storage tissue that supports development of growing embryo

  11. Double fertilization Click on image to play video.

  12. Fruit formation • The mature ovary containing seeds • Modified for seed dispersal

  13. Fruit structure Click on image to play video.

  14. Seed germination • The beginning of the development of a new plant after a period of inactivity, called dormancy • First to appear is the radicle (embryonic root) followed by the hypocotyl (embryonic stem)

  15. Seed (containing embryo plant) to mature plant, capable of photosynthesis

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