Hollow ball of cells

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Study for the Leaving Certificate Biology Test. Prepare with flashcards and multiple-choice questions. Each question includes hints and explanations to enhance learning. Get ready to excel in your exam!

Multiple Choice

Hollow ball of cells

Explanation:
A hollow cavity develops inside the embryo during early development, creating a hollow ball of cells called the blastocyst. After fertilization, the zygote divides to form a solid ball of cells called the morula. Later, fluid enters and forms a cavity (the blastocoel), turning the morula into the blastocyst. The blastocyst has an outer layer of cells (trophoblast) and an inner cell mass that will become the embryo, with the cavity inside. Therefore, the hollow ball of cells describes the blastocyst best. The zygote is a single cell, the morula is still solid, and the embryo is a later stage.

A hollow cavity develops inside the embryo during early development, creating a hollow ball of cells called the blastocyst. After fertilization, the zygote divides to form a solid ball of cells called the morula. Later, fluid enters and forms a cavity (the blastocoel), turning the morula into the blastocyst. The blastocyst has an outer layer of cells (trophoblast) and an inner cell mass that will become the embryo, with the cavity inside. Therefore, the hollow ball of cells describes the blastocyst best. The zygote is a single cell, the morula is still solid, and the embryo is a later stage.

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