Stages of Animal Development: Cleavage, Gastrulation, Organogenesis

The video explains the development of animals, starting with their reproduction through sperm and egg fertilization, leading to the formation of a zygote. It covers the process of cleavage, blastula formation, and gastrulation, where germ layers become apparent. Diploblastic and triploblastic animals are discussed, highlighting their unique germ layers and body cavities. The video concludes with organogenesis, where cells differentiate into various organ systems.

What is the process called where a single large cell divides into many smaller cells without growth?

• Cleavage

• Organogenesis

• Differentiation

• Gastrulation

In diploblastic animals like cnidarians, which two germ layers are present?

• Mesoderm and Gastrodermis

• Ectoderm and Mesoderm

• Endoderm and Mesoderm

• Ectoderm and Endoderm

What is the third embryological layer found in triploblastic animals?

• Gastrodermis

• Mesoderm

• Endoderm

• Ectoderm

Which type of body cavity is completely surrounded by the mesoderm?

• Coelomate

• Pseudocoelomate

• Parenchyma

• Acoelomate

During organogenesis, which germ layer forms the nervous system?

• Endoderm

• Ectoderm

• Gastrodermis

• Mesoderm

What does the endoderm begin to form during organogenesis?

• Nervous system

• Respiratory tract

• Circulatory system

• Muscular system

What is the term for the process where cells in each germ layer further differentiate into organ systems?

• Cleavage

• Gastrulation

• Organogenesis

• Symmetry