21. Function:
Long, slender
tube that
connects the
stigma to the
ovary
Acts as a
conveyor
(carrier from
one place to
another) of
pollen grains
style
26. Microspore
mother cell
pollen sacs
microspores
anther
sperm cells
stigma
mature
pollen
grain Immature
pollen grain
generative cell
tube cell
nucleus
Microspore
mother cells develop
within the pollen
sacs of the anther
of a flower
1
Meiotic cell division
produces four haploid
microspores
2
Each microspore
produces an
immature male
gametophyte (a
pollen grain) by
mitotic cell division
3
MEIOTIC CELL
DIVISION
The generative
cell produces two
sperm cells by mitotic
cell division; the male
gametophyte is now
mature
4
3
4
haploid (n)
diploid (2n)
27. A megaspore mother cell
develops within each ovule
of the ovaries of a flower
1
Cytoplasmic division
produces the seven cells of the
mature female gametophyte
4
Meiotic
cell division
produces four
haploid
megaspores;
three
degenerate
2
The single remaining
megaspore forms eight
nuclei by mitosis
3
MEIOTIC CELL
DIVISION
ovule megaspore mother cell
integuments
megaspores
central
cell with
two nucleifemale
gametophyte
haploid (n)
diploid (2n)
egg cell
ovary