Lecture 22- Seedless Vascular Plants

Question 1

where do seedless vascular plants normally live?

Answer 1

moist environments

Question 2

what do seedless vascular plants consist of?

Answer 2

monilophytes (ferns)
lycophytes (club mosses)

Question 3

is the fern lifecycle heterosporous or homosporous?

Answer 3

homosporous

Question 4

how does the fern lifecycle work?

Answer 4

fertilization
zygote (2n)
mature sporophyte (2n) (fern)
sporangium (2n) that are on the backside of the leaves go through meiosis
spores (n) are released using a catapult system
spore turns into a thallus (n)
antheridium (sperm) and archegonium (egg) are released from the thallus for fertilization.

Question 5

what does a thallus consist of?

Answer 5

rhizoid (for anchorage)
no roots stems leaves or cuticle

Question 6

the fern lifecycle is monoecious, what does that mean?

Answer 6

both sperm and egg are produced by mitosis on the same gametophyte (thallus)