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How does a birds egg protect and nourish a developing embryo compared to a frogs egg?
A bird's egg is designed with a hard shell that provides physical protection and a complex structure that includes membranes and a nutrient-rich yolk to nourish the developing embryo. The albumen (egg white) also offers additional protection and hydration. In contrast, a frog's egg is typically soft and jelly-like, lacking a hard shell, which allows for more immediate environmental interaction but provides less protection. The jelly serves to protect the eggs from predators and desiccation, while the surrounding water provides nutrients and a suitable environment for development.
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What three structures protect and nourish the developing embryo?
Placenta, amniotic fluid and umbilical cord.
Is an egg considered a tissue?
No, an egg is not considered a tissue. It is a reproductive structure produced by female animals, and its function is to protect and nourish the developing embryo.
What does chicken egg mean?
A chicken egg is a round or oval body laid by the female chicken, which consists of an ovum surrounded by layers of membranes and an outer casing, which acts to nourish and protect a developing embryo and its nutrient reserves.
What is the physiological function of fats in seeds?
Fat in seeds is located in the portion of the seed called the endosperm. This is a lipoprotein complex that serves to nourish the developing embryo when the seed germinates.
What connects the developing embryo to the placenta?
The developing embryo is connected to the placenta through the umbilical cord. This cord contains blood vessels that transport nutrients, oxygen, and waste products between the embryo and the placenta, facilitating crucial exchanges for fetal development. The placenta itself acts as an interface, allowing maternal blood to nourish the embryo while protecting it from certain substances. This connection is vital for the embryo’s growth and overall health during pregnancy.
Why does a membrane enclose an egg once a sperm has entered?
It prevents secondary fertilization by another sperm cell.
What is the nutrient for the embryo that arises from the ovum called?
The yolk sac arises from the ovum to nourish the embryo.
What protects and nourish the developing embryo?
The developing embryo is protected and nourished by the amniotic sac, which contains amniotic fluid that cushions the embryo and provides a stable environment. The placenta plays a crucial role by facilitating the exchange of nutrients, gases, and waste between the mother and the embryo, while also producing hormones that support pregnancy. The umbilical cord connects the embryo to the placenta, ensuring a continuous supply of essential substances. Together, these structures ensure the embryo's growth and development throughout gestation.
What does the chicken egg yolk do?
The yolk is there to nourish the growing embryo.
How does double fertilization happen?
In double fertilization, one sperm reaches the egg and fertilizes it. This produces a diploid zygote that will grow into the plant embryo. A second sperm fuses with the endosperm nuclei in the embryo sac and produces the triploid endosperm. This will nourish the developing seedling.
What is the function of endosperm in monocot and dicot seed?
The endosperm in monocot seeds serves as a nutrient reserve that provides nourishment to the developing embryo. In dicot seeds, the endosperm is often absorbed by the developing embryo during seed maturation, leaving the cotyledons to function as the primary nutrient storage tissue.
How does the protein control the sex of a developing embryo?
Genes control the sex of a developing embryo.
