More Life Cycles Flashcards
What are some similarities between vascular seedless plants and bryophytes?
Spores are the dispersal stage
Sperm must swim to the egg
What is a homosporous spore?
All spores look the same and are he same size. They develop into gametophytes that look the same
What is a heteropsoprous?
Produces two different types of spores, one big and one small. Develop into male and female gametophytes
What is a sporophyll?
A leaf with sporangia on them
What is the microsporangia?
Produces and houses microsporocytes which undergo meiosis to become 1N micro spores
What is the megasporangia?
Houses and produces megasporocytes which undergo meiosis to produce 1N megaspores
How are mega and micro spores dispersed?
The wind
What is the advantage of a sporophyte dominant generation?
Increased size leads to increased spree producing capacity
Increased size leads to better spore dispersal
What is feature unique to heteropsoprous plants besides the two types of sprorangia?
The gametophytes develop within the spore all.
The spore must contain all nutrients for gametophyte to develop. Nutrients comes from sporophyte parent
What is the advantage of self contained spores with the gametophyte developing inside the spore wall?
Enhances survival of gametophyte
What is the advantage of having different sized spores?
Bug spore supports development of big female gametophyte which is necessary to support development of new gametophyte
Small gametophyte only produces sperm
What is the dominant stage in vascular seedless plants?t
The sporophyte
What generation is dominant in vascular seedless plants?
Sporophyte (2N)
What lifecycle does a charophytes have?
Haploid
Do plant gametophytes produce gametes by meisosis?
No
What is the poloidy of the various tissues of a fungus?
Fruiting body- dikaryotic
Mycelium and hyphae- haploid
When did plants first evolve?
Paleozoic
What is the ploidy of a basiciospores?
1N
What is the ploidy of the sporangia?
2N
What is the ploidy of a gymnosperm gametophyte?
1N
What’s the difference between a gemtophyte a gametangium and a gamete
The gametangium produces the gametophyte which is 1N, and produces the 2N gametes
What is the dispersal stage of a bryophyte?
The spores
What type of multicellular organism has a ploidy of 2N and produces spores by meiosis?
Sporophyte
What is the dispersal stage of a fern?
Spore
What entity nourishes developing fern embryos?
Gametophyte
What entity nourishes developing bryophyte embryos?
Gametophyte
When hyphae of two mating types of a Basidiomycota undergo plasmogamy, the resulting hyphae will have a ploidy of what?
Dikaryotic
What type of multicellular organism has a ploidy of 1N and produces gametes by mitosis?
Gametophyte
A developing fern embryo is called..
A sporophyte
Immediately following karyogamy, nuclei in a Basidium will have a ploidy of….
2N
What is the dispersal agent in charophytes?
Zygote
What stage is multicellular in a charophytes and in a byyophyte?
Moss- diploid
Charophytes- haploid p
