plant reproduction: seedless plants. review: what are the different types of plant reproduction?...
TRANSCRIPT
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Plant Reproduction: Seedless Plants
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Review: What are the different types of plant reproduction?
• Sexual reproduction– Are these cells haploid or diploid?
• Asexual reproduction– Are these cells haploid or diploid?
• Today we are learning about reproduction in seedless plants by SPORES– Which type of reproduction produces spores?• SEXUAL REPRODUCTION
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What types of plants are seedless?
• Ferns and moss• Found in cool, moist, shaded areas in the
forest• Usually grow near the ground • Reproduce sexually by SPORES
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Life Cycles of Seedless Plants (Ferns and Moss)
• Plants reproduce and have a life cycle– Ex: one stage is reproduction
• Plants have a life cycle with 2 stages– GAMETOPHYTE STAGE• Gametes = sex cells, phyte = plant
– SPOROPHYTE STAGE• Sporo = spores, phyte = plant
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Life Cycles: Plant Stages• GAMETOPHYTE stage– Reproduction: where cells go through the
process of meiosis– HAPLOID cells (HALF the number of
chromosomes)
• SPOROPHYTE stage– Fertilization: when haploid cells combine– DIPLOID cells (DOUBLE the
number of chromosomes)
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Life Cycles: Plant Stages
• When a plant’s life cycle alternates (changes) between gametophyte and sporophyte stages, this is called:
ALTERNATION OF GENERATIONS
• This means that the plant changes between the two stages:– Sporophytes produce spores– When the spores mature, they are called gametophytes
because they produce the sex cells (gametes) and once the gametes combine, produce the sporophyte again!
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Life Cycles: Plant Stages
• In ferns, spores are produced in structures called SORI
• These are found on the underside of leaves– Red – brown or black colored bumps – These cells have gone through meiosis to form
spores and each one can grow into a new plant!