Lecture 8: plant diversity I Flashcards
1
Q
Where did land plants evolve from
A
ancestral charophytes
2
Q
who are the sister taxa to land plants
A
modern charophytes
3
Q
adaptations of charophytes
A
- live at edges of ponds
- sometimes dries out -> selection favors survival on dry land
4
Q
what are the derived traits of charophytes
A
- sporopollenin: layer of polymer, surrounds zygote, prevents desiccation
- structure of flaggellated sperm
- cell plate
- rings of cellulizing - synthesizing protiens
5
Q
derived traits of land plants
A
- 2 multicellular life stages
- multicellualr, dependent embryo
- walled spores: produced in sporangia
- multicellular gametangia
- apical meristems
- cuticle
- stomata
6
Q
haploid gametophyte
A
- produces gametes by mitosis
7
Q
haploid sporophyte
A
- produces spores by meisosis
8
Q
multicelullar, dependent embryo
A
- 2n embryo retained within tissue of female gametophyte
- nutrients transferred from parent
- land plants called embryophytes
9
Q
walled spores produced in sporangia
A
- sporangia
- sporocytes
- spores
- spore wall contains sporopollenin
- resistant to harsh conditions
10
Q
sporangia
A
- multicellualr organs that produce spores (2n)
11
Q
sporocytes
A
- diploid cells, undergo meiosis -> haploid spores
12
Q
spores
A
haploid reproductive cells (n)
- mitosis-> multicellular gametopyte
13
Q
multicellular gametangia
A
- multicellular gamete- producing organ - 2 types (archegonia, antheridia)
- haploid by mitosis
14
Q
archegonia
A
female, produces eggs, sites of fertilization
15
Q
antheridia
A
male, produce and release sperm
16
Q
apical meristems
A
- plnats dont move, they enlogate
- regions of cell divisions at tips of roots and shoots
- cell differentiate from apical meristems