Transcript Chapter 31.1

Reproductive Structures of
Flowering Plants
AP Biology
Spring 2011
 Flowers
form on a modified branch of the
sporophyte when master genes in the
_____________ are turned on
 Flower
parts are arranged in ________ of
modified leaves on the end of the
receptacle
 ________:
outermost green, leaf-like parts
arranged in a ring called the __________
 ________: the coloured parts located
between the reproductive structures and
the sepals, arranged in a ring called the
___________
 _________:
male parts, slender stalk
(___________) capped with an _________,
inside which pollen sacs enclose pollen
grains
 ________: female parts, vessel shaped
structures with an expanded lower ______
(with ovules), slender column (______),
and an upper surface (______) for pollen
landing
 Meiosis
of cells within flowers produces
____________ spores
• _______________ in the anther
• _______________ in the ovule
 They
then undergo mitosis to produce
the haploid ____________ that ultimately
become the _____ or _______
 The
egg and
the sperm
fuse to form
the diploid
zygote
 As the zygote
develops into
a plant, the
______ is
formed
 ___________________: have
all four whorls
(sepals, petals, stamens, and carpels)
 ________________: are missing one or
more whorls
 _____________: have
both stamens and
carpel (both sexes on one flower)
 ______________: produce either stamens
or carpels and are known as either
“male” or “female” flowers