what are the two phases in the life cycles of moss and fern? How do they differ from each other?
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Answers
Answer:
~~~~LIFE CYCLE OF MOSSES:
Mosses alternate between a haploid (n) gametophyte stage & a diploid (2n) sporophyte stage
• Gametophyte is the dominant generation
~~The haploid gametophyte stage contains half the chromosome number & produces gametes (egg & sperm)
• Gametophyte stage is dominant in the moss's life cycle
• Gametophytes are photosynthetic & have root-like rhizoids
• The diploid sporophyte has a complete set of chromosomes & produces spores by meiosis
• Sporophyte of a moss is smaller than, & attached to the Gametophyte
• Sporophytes lack chlorophyll & depend on the photosynthetic gametophyte for food
• Sporophyte has a long, slender stalk topped with a capsule
• Capsule forms haploid (n) spores
~~Fern Life Cycle:
• Spores produced on underside of fronds in clusters of sporangia called sori
• Spores undergo meiosis, are spread by wind, & germinate on moist soil to form prothallus
• Prothallus begins the Gametophyte stage
• Mature Gametophytes are small, heart-shaped structures that live only a short time
• Male antheridia & female archegonia grow on the prothalli
• Sperm must swim to the egg to fertilize it & developing embryo becomes the Sporophyte generation
• Newly forming fronds are called fiddleheads & uncurl.