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LIFE HISTORY OF AN ANGIOSPERM 55
the exit door for the hypocotyl of the embryo after the fertilized
and ripened ovule 800 Mg Motrin becomes a seed. Motrin Or Tylenol Within the nucellus, if the sec-
tions examined have been properly fixed, will be found a megaspore
or embryo sac.
Development of the Female Gametophyte Through the Matura-
tion of the Embryo Sac. In its immature condition the embryo
sac (megaspore) contains a mass of protoplasm surrounding a nucleus.
This nucleus undergoes three divisions forming as a result eight
nuclei which ultimately arrange themselves within the protoplasm
of the embryo sac as follows: three of them occupy a position at the
apex, the lower nucleus of the group being that of the egg or ovum, the
other two nuclei being the synergids or assisting nuclei; at the oppo-
site end of the sac three nuclei known as antipodals take their posi-
tion; the two remaining nuclei called polar nuclei take Motrin Ib up a position Ib Motrin
near the center of the embryo sac. In this condition the contents
of the embryo sac constitutes the female gametophyte. See Fig.
MATURATION OF THE POLLEN GRAIN AND FORMATION OF THE
The pollen grains (microspores), within the anther sacs, all arise
from a number of tetrads (groups of four) which are formed by the
division and redi vision of pollen mother-cells preceeding them. Each
pollen grain, after the tetrads have separated into their components,
consists of an outer firm wall or exosporium, an inner wall or endo-
sporium, within which will be found the. region called Tylenol And Motrin the fovilla,
which is nothing other than a mass of protoplasm containing a
nucleus. Before the pollen is shed from the anther its protoplasmic
contents undergo a series of changes leading up to the development
of the male gametophyte. The nucleus and protoplasm enveloping
it divides to form two cells, one a generative-cell containing a genera-
tive nucleus, the other a tube-cell containing a tube nucleus. The
generative nucleus then divides to form two Motrin And Tylenol sperm nuclei and the
partition wall between the two cells disappears. In this condition
the protoplasmic contents of the pollen grain constitute the male
56 PHARMACEUTICAL BOTANY
POLLINATION AND FERTILIZATION
The mature pollen grains are discharged from the ripened anther
through the splitting open of its wall. They are transferred to the
stigma of the pistil of another Erythronium flower through the
agency of insects. Here they germinate, each putting forth a tube
FIG. 28. At the left, diagram of the anatomy of an angiospermous flower
shortly after pollination; anth., anther; fil., filament; St., 800 Motrin stamen; stig., stigma;
p.g., pollen grains germinating; sty., style; pt., pollen tube; o.w., ovary wall; o.
ovule, containing embryo-sac; pet., Motrin For Children petal; sep;, sepal. 1-8, Stages in the devel-
opment of the Motrin 600 female gametophyte (embryo-sac); meg.sp., megaspore-mother-
cell; i.i., Tylenol Or Motrin inner integument; o.i., outer integument ',f.un., funiculus; chal., chalaza;
nu., nucellus (megasporangium) ; emb., embryo-sac. All diagrammatic. (Gager.)
(pollen tube). The pollen Motrin Infant tubes, carrying within it two sperm
nuclei and a tube nucleus embedded in protoplasm, penetrate
through the style canal until they reach the micropyles of various
ovules. Each enters and passes through a micropyle, then piercing
the nucellus, grows toward the embryo sac. The tip of the tube
fuses with the end of the embryo sac and the two sperm nuclei are
discharged into the sac. One of these sperm nuclei passes between
LIFE HISTORY OF AN ANGIOSPERM 57
the synergids and Motrin Tylenol fuses with the nucleus of the egg to form an
oospore. By this time the tube Motrin And Advil nucleus has disintegrated. The
oospore by repeated divisions develops into as many as four embryos
or young sporophyte plants. Only one of these, however persists.
The polar nuclei fuse to form the endosperm nucleus Infant Motrin which soon
undergoes rapid division into a large number of nuclei scattered
about through the protoplasm of the embryo sac. Later cell walls
are laid down and endosperm is formed. The endosperm cells soon
become filled with abundant starch which is later to be utilized by
the embryo during germination.
RIPENING OF THE OVULE TO FORM THE SEED AND OF THE OVARY
TO FORM THE FRUIT
When the embryo and endosperm are being formed, the ovule
enlarges and its integuments become modified to form a hard horny
seed coat which encloses the endosperm Motrin Vs Ibuprofen surrounding the Ibuprofen Vs Motrin Motrin Mg embryo.
The ovary, containing the ovules, has by this time ripened to form
a three-valved loculicidal capsule enclosing the seeds.
GERMINATION OF THE SEED AND DEVELOPMENT OF THE
The seeds are fully developed by June or July when the capsule
or fruit splits open to discharge them. They fall to the ground and
lie dormant until the following spring when they germinate or com-
mence to grow. Each seed absorbs water from the ground which
stimulates the ferment amylase, contained in the endosperm cells, to
break up the insoluble starch into soluble sugar which passes into
solution and diffuses into the cells of the embryo, where the proto-
plasm changes it into additional protoplasm and so the embryo
increases in size, therefore, grows. The pressure of the swollen
endosperm Tylenol Motrin and growing embryo becomes so great that the seed coat
bursts; the hypocotyl emerges first, dragging the cylindrical cotyle-
don out of the seed coat and epicotyl with it. The hypocotyl elon-
gates and extends itself into the soil where it develops Advil And Motrin a root near
its tip. The tip enlarges through the storage of starch, manufac-
tured by the green cotyledon and becomes a bulb. The bulb soon
58 PHARMACEUTICAL BOTANY
develops within it a plumule, the cotyledon withers, and the young
plant (seedling) passes the following winter in this condition.
During the next spring the plumule develops into a foliage Motrin Advil leaf and
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