Lecture 7 Flashcards
Mature microgametophyte (germinated pollen)
3-celles pollen tube
Pollen grain is attached to pollen tube that contains 2 (non-flagellated) sperm cells and 1 tube nucleus
The pollen tube travels down the ____ enters ____ to release ____ into ____?
Down the ovary
Enters the ovule
Release sperm cells
Into the ovule
Mature megagametophyte (ovule)
Angiosperm ovule
Consists of the angiosperm ovule, integuments, and egg
Angiosperm ovule -> integumentary megasporangium -> megastore -> gametophyte -> seed (after fertilization)
Cell Types compromising the mature megagametophyte (4)
Antipodals, central sac, egg, synergids
Double Fertilization Events
1) produce zygote (one sperm cell fusing with egg)
2) produce endosperm (other sperm cell fusing with 2 polar nuclei to make a triploid nucleus that forms the endosperm nucleus
Eudicot Seed Components (7)
Seed coat Plumule Hypocotyl Radicle Hilum Microphyle Cotyledon
Division of apical cells give rise to (4)
Shoot apical meristems
Hypocotyl
Epicotyl
Embryonic leaves (cotyledons)
Divisions of basal cells give rise to (2):
Multicellular suspensors
Portions of the Root
Layers of bark consisted of what cells?
Consists of phloem and periderm
Layers: outer bark -> inner bark (functional phloem) -> vascular cambium -> II° xylem
Periderm consists of (3)
Cork cambium
Cork (altnernating layers of suberin + wax)
Phelloderm
What is a lenticel?
Sponge opening that form an outer cork where gases can diffuse (think: tree cut)
Process of meiosis and fertilization
Multi-celled (2n) diploid individual -> MEIOSIS -> spores -> germination -> multi-celled (n) haploid individual -> mitosis -> single celled gametes -> FERTILIZATION + fusion -> single-celles zygote -> multi-celled embryo -> multi-celled (2n) diploid individual
Flower’s vegetative (4) and fertile parts (2)
Vegetative: pedicel, receptacle, sepal, petals
Fertile: stamens, pistols and carpels
