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Flowers and Reproduction (life cycle (sporophytes (spores (mega #, micro…
Flowers and Reproduction
Sexual
angiosperms
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flowers
life cycle
sporophytes
diploid (2n)
cells undergo meiosis
produces haploid spores
spores
mega
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micro
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egg
zygote
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megagametes
sperm
microgametes
gametophyte
microgametophyte
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megagametophyte
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:
cross pollination
cross-pollination
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pollination of a carpel by pollen from a different indiv.
genetic diveristy
self-pollination
pollination of same indiv
self-fertilization
in flowers that have both
is prevented
anther
stigma
compatibility barriers
prevent pollen growth
Asexual
fragmentation
large spreading of plant grows out
angiosperms
numerous methods
Flower structure
pedicel
flower stalk
end of axis is the receptacle
floral appendages
petals
above sepal
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together make the corolla
perianth
leaf-like
stamens
above the petals
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androecium
produce pollen
in the anther
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sepals
lowermost and outermost
modified
protect flower bud
all together are the calyx
carpels
gynoecium
three main parts
style
elevates stigma position
ovary
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megaspores produced
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placentae
ovules
nucellus in center
stigma
catches pollen grains
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complete flowers
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fruit types seed dispersal
true fruit
contains only ovary tissue
accessory fruit
nonovarian tissue present
false fruit
Simple fruit
most common
develops from one ovary
aggregate fruit
separate carpels from one gynoecium fuse
classifying
dry or fleshy
dehiscent or indehiscent
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