The Ectoderm, Mesoderm, and Endoderm Are Formed During the Stage

question 15

Multiple Choice

The ectoderm, mesoderm, and endoderm are formed during the stage of embryogenesis.

• A) Fertilization
• B) Cellular blastoderm
• C) Syncytial blastoderm
• D) Gastroderm
• E) None of the answers are correct

---

Definitions:

Xylem

Tissue in plants responsible for the transport of water and nutrients from the roots to the leaves and stems.

Cell Layer

A single or multiple layers of cells forming a barrier or a structured component in an organism.

Secondary Xylem

The part of a plant's xylem that is produced after the first growth season, providing additional support and water transport.

Sieve Tube Elements

Specialized cells in phloem of vascular plants, forming channels for transporting sugars and other nutrients.