Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
origin of land plants
|
-475 mya; fossils found with cuticle, spores, sporangia
|
|
|
Silurian-Devonian explosion
|
~444-359 Mya
-similar to Cambrian explosion -all major plant innovations except flowers |
|
|
alternation of generations
|
-all land plants
-gametophyte generation produces haploid gametes by mitosis -sporophyte generation produces spores via meiosis |
|
|
green plants
|
-land plants and green algae (protists)
|
|
|
green algae
|
-traditionally grouped with protists
-form monophyletic group with green plants -closest living relative to land plants |
|
|
Transition to Land
|
Why?
-Sunlight and CO2 more readily available Challenges: -threat of desication -transporting water through the plant body -establishing an upright body to compete for sunlight -transporting gametes without water |
|
|
alternation of generation
|
Gametophyte-haploid
-produces haploid gametes through mitosis Sporophyte-diploid -produces haploid spores via meiosis |
|
|
Important Plant parts
|
-cuticle
-stomata -vasular tissue and lignin -sporangia -gametangia |
