Angiosperm Reproduction
Biology 212 with Howard at Western Oregon University
About this deck
By: Saudi Ibarra
Created: 2011-05-17
Size: 32 flashcards
Views: 3
Created: 2011-05-17
Size: 32 flashcards
Views: 3
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Floral Organs
Called sporophylls
4 whorls of modified leaves
some sterile, some fertile
ABC model of flower formation
3 classes of floral identity genes
Class A and C genes are mutually inhibitory
Diversity in flowers
Complete flowers
incomplete flowers
variation in size, color, shape, odor
pollinator reward
relative placement on the plant and time of opening
Pollination
transfer of pollen from anther to stigma
Bees' Role in Pollination
Bright colors (yellow/ red)
see UV radiation- Nectar guides
Sweet fragrance
feed on nectar and pollen
Birds' role in pollination
Bright colors
little or no scent
feeds on nectar often tube shaped
bats and moths' role in pollination
light colored flowers
strongly aromatic
feed on nectar and/or pollen
Percentage of abiotically pollinated
20%
percentage pollinated by wind
19.4%
In what ways are the structures of flowers well suited to their mode of dispersal?
IDK
Why do grasses and trees like pines use wind dispersal?
IDK
Alternation of generations
Sporo-
seed
gameto
husband and wife
phyte
organism, often plant
cyte
a cell
angium
a vessel or enclosure
where is male gametophyte produced?
in a microsporangium in the anther of the stamen
how is the male gametophyte produced produced?
meiosis: microspores
mitosis: mature gametophyte
Male gametophyte
2 cells (generative cells inside tube cell)
gametophyte+ spore wall= pollen grain
Female Gametophythe
7 cells and 8 nuclei (3 antipodal, 1 endosperm, mother cell with 2 nuclei, 1 egg, and 2 synergids)
embryo sac
ovule that is female gametophyte+integuments
Where is the female gametophyte produced
In a megasporangium in an ovule in the ovary of the carpel
How is the female gametophyte produced?
meiosis: megaspores
mitosis: mature gametophyte
Fertilization (syngamy)
fusion of sperm and egg to form a zygote
Why is double fertilization an important adaptation to avoid wasting nutrients?
IDk
Function of seeds
survival and dispersal
characteristrics of seeds
dormant
resistant
nutrient rich (proteins, oils, starches)
How do the characteristics of seeds enable the functions of seeds?
IDK
Which structures are involved in creating which characteristics in seeds?
IDK
Phases in seed maturation
1. Endosperm develops
2. Embryo forms
3. Dehydration and dormancy
What is the function of the suspensor?
IDK
Mature seed
Seed coat
endosperm (not always present)
embryo
About this deck
By: Saudi Ibarra
Created: 2011-05-17
Size: 32 flashcards
Views: 3
Created: 2011-05-17
Size: 32 flashcards
Views: 3
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have used this website for three exams, and I see a huge difference in my test results.”
Naj
Naj