topic 9- land plants and algae cont!

orders of green alge:

• some are unicellular (1 cell)

• others are colonial (volvox)—> hollow sphere of individual cells—> basically you could remove any one of them and they could live on their own

• fillaments

• ulva (multicellular group of cells)

life cycle of ulva:

alteration of generations

2 generations:

• sporophite generation: always made up on mulicellular diploid cells 

• gametaphite generation: made of haploid cells

occurs in sporangela (produces spores (haploid) known as sporic meosis)

what did land plants arise from?

green algae

when is i the only time that the gametaphite generation is always dominate?

in nonvascular plants

examples of non-vascular plants:

• liverwarts

• hornworts

• mosses

why can’t mosses grown tall?

because they don’t have lignen

why are non-vascular plants always losing water?

because they have pores that never shut 

what do all land plants exhibit during sexual reproduction?

alterations in generations

where does meosis occur?

sporangea

what is the sporophite generation made up of?

multicellular diploid cells

what is the gametaphite generation always mafe up on?

haploid cells 

isogamy:

when gametes are identical