Ectoderm produces

Options

A. Mesodeaeum
B. Proctodaeum
C. Stomodaeum
D. Both B and C.

Answer

**Step-by-Step Solution:**

1. **Understand the Ectoderm:** The ectoderm is one of the three primary germ layers in the early embryo. It is responsible for forming various structures in the body.

2. **Identify What Ectoderm Produces:** The ectoderm gives rise to several important structures, including the nervous system, skin, and certain membranes.

3. **Examine the Options:**
- **A. Meso-dianam:** This term does not correspond to any known structure produced by the ectoderm.
- **B. Proctodianam:** This term refers to the part of the embryonic structure that develops into the anal region.
- **C. Stomodiam:** This term refers to the part of the embryonic structure that develops into the mouth region.
- **D. Both B and C:** This option suggests that both proctodianam and stomodianam are produced by the ectoderm.

4. **Conclusion:** Since both proctodianam and stomodianam are formed from the ectoderm during embryogenesis, the correct answer is option D, which states that both B and C are produced by the ectoderm.

**Final Answer:** D. Both B and C

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