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Ch.9 Flowers and Reproduction (sexual reproduction (plant life cycle…
Ch.9 Flowers and Reproduction
sexual reproduction
plant life cycle
gametes= sperm or eggs
zygote= fertilized egg
sporophytes always diploid
gametophyte= a new haploid plant
microgametes= small sperm cells
megagametes= large eggs
microgametophyes= male
from microspores
megagametophytes= female
from megaspores
flower structure
pedicel= flower stalk
receptacle on opposite side of pedicel
4 types floral appendages
sepals
petals
stamens
carpels
complete flowers have all 4
#
incomplete flowers have less than the 4 types
stamens
which are known as androecium
have two parts:
filaments
anther
microsporocytes enlarge and undergo meiosis
pollen= microspores
carpels
stigma
#
catches pollen grains
style
elevate stigma
ovary
megaspores produced
ovules= regions of tissue that bear small structures
nucellus
central mass of parenchyma
gametophytes
microgametophytes
developed from microspores
pollen tube penetrates into the loose, open tissue of the stigma
megagametophytes
developed from megaspores
flower structure
cross-pollination
pollination of carpel from same or another flower
