Question

Choose the correct one:

• A. Ectoderm- Liver
• B. Mesoderm- Brain
• C. Mesoderm- Skeleton
• D. Ectoderm - Epidermis

Answer 1

Answer: (C), (D)

Ectoderm - Epidermis

The correct options are C and D.

Explanation of the correct options:

Option C:

1. The three germ layers that arise in the earliest stages of embryonic development are the endoderm (inner layer), mesoderm (middle layer), and ectoderm (outer layer).
2. The muscles, which are a crucial component of the skeletal system, are formed by the mesoderm.
3. The heart, kidneys, gonads, genital ducts, cartilage, muscles, blood cells, and other tissues are all descended from the mesoderm.

Option D:

1. The ectoderm develops into two sections during neurulation.
2. The first is the surface ectoderm, which develops into the skin, hair, and nails on the outside of the body.
3. The second is the neuroectoderm, which develops into the embryo's nervous system.

Explanation of the incorrect options:

Option A:

1. The colon, stomach, intestines, lungs, liver, and pancreas are a few of the organs that are formed from endoderm cells, not ectoderm.
2. Contrarily, the ectoderm eventually gives rise to the epidermis (the outermost layer of skin) and hair, which are considered to be parts of the body's "outer linings".
3. Hence, it is an incorrect answer.

Option B:

1. The muscles, which are a crucial component of the skeletal system, are formed by the mesoderm.
2. Whereas, the ectoderm forms the outer linings of the brain.
3. Hence, it is an incorrect answer.

Final answer: The correct pairs are Mesoderm- Skeleton, and Ectoderm - Epidermis.