Amniotic egg

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Created by:

Leolani  on June 12, 2010

Subjects:

Biology

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Amniotic egg

Albumen

The white part of the egg, technically called the albumen is what God put in the egg to protect the embryo.
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English

Albumen
The white part of the egg, technically called the albumen is what God put in the egg to protect the embryo.
Allantois
The next membrane, the allantois, is a sac of blood vessels that allows for the respiration and excretion of the embryo.
Amnion
The amnion grows around the embryo, forming a fluid-filled sac in which the embryo floats.
Carpel (or pistil)
The carpel is composed of the stigma, style, and ovary. The stigma is covered in a sticky substance designed to catch pollen grains; the style is an extension of the ovary designed to hold the stigma up where it can be exposed to pollen grains.
Chorion
The chorion is a membrane that envelopes all of the structures that we just described.
Ovules
The ovary contains the ovule (ov' yool), where the embryo sac develops. The embryo sac contains the eggs of the plant, and it is where the seed develops. We will talk more about that in a moment.
Shell
Once this happens, the developing zygote is encased in a protective shell. The shell is a remarkably engineered structure which is just porous enough to exchange gases with the environment but not porous enough for water to evaporate out of the egg!
Stamen
The stamens have long filaments that serve as "stalks" which support the anther. The anther contains pollen grains, which we will discuss more in a moment. These pollen grains contain haploid cells that function as the sperm of the plant.
Sepal, Receptacle, Pedicel
The pedicel is the stem that holds the flower; the sepals are the green leaflike structures above the pedicel; the petals are the leaflike structures above the sepals.
Yolk
The next membrane is called the yolk sac. An amniotic egg has a clump of nutrients that is used to sustain the embryo during development.
Yolk Sac
This clump of nutrients is called the yolk, and the yolk sac encloses it.

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