Gastrulation occurs after segmentation

• A. True
• B. False

Answer: (B)

Verified step by step guidance

1. Understand the process of embryonic development: Gastrulation is a crucial phase in early embryonic development where the single-layered blastula is reorganized into a multilayered structure known as the gastrula.
2. Identify the sequence of developmental stages: Gastrulation typically follows the cleavage and blastulation stages, not segmentation. Segmentation occurs later in development, particularly in organisms with segmented body plans.
3. Clarify the role of segmentation: Segmentation refers to the division of the body into repetitive segments, which is a process that occurs after gastrulation in many organisms.
4. Examine the timing of gastrulation: Gastrulation is one of the early events in embryonic development, setting the stage for the formation of the three germ layers: ectoderm, mesoderm, and endoderm.
5. Conclude the relationship between gastrulation and segmentation: Since gastrulation precedes segmentation, the statement 'Gastrulation occurs after segmentation' is false.