Lecture 18: Angiosperms Flashcards
what are angiosperms?
seed plants with fruit and flowers
____ have one embryonic leaf, ____ have two embryonic leaves
- monocots
- eudicots
why are angiosperms so diverse? i.e lots of fertilization?
because theres a reward! production og fruit
_____ are specialized shoots with modified leaves
flowers
____ enclose flower
sepal
___ attract pollinators (flower)
petals
___ produce pollen (flower)
stamen
____ produce ovules
carpels
what are the components of a carpel?
ovary, style, stigma
what is the main function of an ovary in a carpel?
to protect ovule, where fertilization occurs
what is the main function of a style in a carpel?
elevates stigma
what is the main function of a stigma?
where pollen is received (also releases sugar)
what does a stamen consist of?
filament and anther (where pollen is produced)
____ is formed when ovary wall thickens and matures (can be dry/fleshy)
fruit
what is the function for fruit?
protect seeds, aid in dispersal of seeds
____ has two haploid sperm nuclei
pollen grain
heterosporous, sporophyte flowers are male & female; are both traits of the _____
angiosperm lifecycle
_____ occurs when pollen tube discharges two sperm into female gametophyte within an ovule
double fertilization
what are the two main cells in a female gametophyte (angiosperm)?
central cell, egg
in double fertilization, one sperm _____ and the other combines with _____ to develop _____
- fertilizes egg
- two nuclei in central cell
- endosperm
a triploid endosperm nourishes ____
nourishes developing embryo
within a seed, an embryo consists of _____
root and two cotyledons (embryonic leaves)
