Chapter
27 What
is a Flower?
Chapter
27 What
is a Flower?
Petals - non-fertile
leaf-like structures surrounding the fertile organs of a flower, usually soft
and colored conspicuously.
Sepals
leaf-like structures at the base of a flower; protect the flower while its in
bud
Stamen - One
of the male organs of a flower, consisting typically of a stalk (filament) and a
pollen-bearing portion (anther).
Anther - The
pollen-producing producing part of a flower.
Ovary - A
female reproductive gland, which produces female gametes (eggs, or ova).
4 Organs of a flower petals, sepals, stamen. pistil
Complete Flower flower that has all 4 organs
Incomplete Flower flower that lacks one or more organs
Corolla all
of the petals as a group
Nectar liquid
(proteins & sugars) that attracts & is a valuable food for pollenators
Photo-period-ism light - time interval - act of being
response to the duration of oight and dark
periods of a day
Short-day plants bloom when days are shorter
Long-day plants bloom when days are longer
Day-neutral plants dont care how long the day is; bloom
is determined by other factors (temp., moisture, etc)
Micropyle
tiny opening in the ovule where sperm cells enter
Double fertilization 2 sperm cell nuclei unite with 2 cell
nuclei of the female
Endosperm- food
storage tissue that supports embryo development
Fruit mature
ovary of a plant
Dormancy period
of inactivity
Germination beginning
of the development of a seed into a plant
Tropism plants
response to external stimuli
Nastic movement responsive movement that is not dependent on the
direction of the stimulus
Hormone chemical
that causes a physical change