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Section 14.1 Plant Reproduction

Section 14.1 Plant Reproduction. Pages 582-583. Agenda. Recap chapter 13 (13.1-13.3) Continue with xylem and phloem transport: 13.4 / Plant reproduction :chapter 14 Homework : Read pages 582- 591 Pg 592, Qn 3-5, 7, 11. Introduction. Reproduce both sexually and asexually

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Section 14.1 Plant Reproduction

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  1. Section 14.1 Plant Reproduction Pages 582-583

  2. Agenda • Recap chapter 13 (13.1-13.3) • Continue with xylem and phloem transport: 13.4 / Plant reproduction :chapter 14 • Homework : Read pages 582- 591 Pg 592, Qn3-5, 7, 11

  3. Introduction • Reproduce both sexually and asexually • Reproduce sexually by sporic reproduction (alternation of generations) • Both a haploid (1n) gametophyte & a diploid (2n) sporophyte are stages in the reproductive cycle • Gametophyte produces gametes(1n) while sporophyte (2n) produces spores(1n) • Male + female = sporophyte (1n+1n =2n)

  4. Plant life cycle – Alternation of Generations

  5. Sexual Reproduction in Seedless Plants • Includes nonvascular mosses & vascular ferns • Fertilization requires the sperm to swim from the male gametophyte to the egg which is the female gametophyte • Water must be present & the sperm must have a flagellum to enable it to move in the water • In non-vascular plants gametophyte is the dominant generation, thus the plant is long lived and larger

  6. Seedless plants reproduction... • Smaller sporophyte depends on the gametophyte for food & support • In vascular plants, sporophyte is the dominant generation & the gametophyte is smaller & shorter-lived • E.g. Ferns, the large, leafy part is the sporophyte, while the gametophyte is small, barely visible structure • Both groups of seedless plants the gametophyte is free living independent of sporophyte

  7. Seedless Plants Reproduction

  8. Sexual Reproduction in Seed Plants • Include gymnosperms & angiosperms • Gametophytes are not free living plants • Male gametophytes called microspores, are small structures that develop into pollen grains  produce sperm cells • Female gametophyte called macrospores produce egg cells • In seed plants entire gametophyte travels to the female gametophyte

  9. Pollination • occurs when pollen (male gametophyte lands on female reproductive structure of another plant of the same species. • Pollen grain encases the cells that develop into the sperm & protects them from drying out as they travel to the female gametophyte

  10. Sexual Reproduction in Gymnosperms • The sperm is transferred to the egg through pollen tube • Sperm develops in the pollen tube & moves towards the egg

  11. Sexual Reproduction in Gymnosperms

  12. Adaptations! • Structure of pollen, the development of pollen tube allow & structure of seeds allow gymnosperms to reproduce in dry environment.

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