-
surrounded by
layers of
sterile cells that grow into the wall of the
pollen sac. Some of the
cells grow into
nutritive cells that
supply nutrition for...
-
Pollen sac may
refer to:
Structures in
plants that hold
pollen Bee
pollen,
sacs or
balls of
pollen packed by bees This
disambiguation page
lists articles...
-
microsporangia (
pollen sacs). The
female cone (megastrobilus, seed cone, or
ovulate cone)
contains ovules which when
fertilized by
pollen become seeds....
-
angiosperm flowers.
Pollen is
often enclosed in
paired synangia (
pollen sacs). The
synangia lie on the
adaxial (inner) edge of
pollen-bearing leaf-like...
- of stamens, is the
whorl of
pollen-producing male parts.
Stamens consist typically of an anther, made up of four
pollen sacs arranged in two
thecae (sheaths)...
- two-lobed. Each
anther lobe
develops two
pollen sacs, so each
anther has four
pollen sacs.
Development of
pollen sacs begins with the
differentiation of archesporial...
- that each
anther contains one or two
pollen sacs extending along its
entire length.
After the
maturation of the
pollen grains,
dehiscence or
opening of the...
- or megagametophyte, also
called the
embryonic sac, with two male
gametes (sperm). It
begins when a
pollen grain adheres to the
stigmatic surface of the...
- also
known as
pollen sacs. The
microsporangia produce the microspores,
which for seed
plants are
known as
pollen grains. If the
pollen sacs are not adjacent...
-
important for the
nutrition and
development of
pollen grains and a
source of
precursors for the
pollen coat. The
cells are
usually bigger and normally...
