Question

Match LIST-I with LIST-II
\begin{tabularx}{0.8\textwidth}{|l|X|l|X|} \hline \multicolumn{2}{|c|}{LIST-I} & \multicolumn{2}{c|}{LIST-II}
\multicolumn{2}{|c|}{Parts of Mesoderm} & \multicolumn{2}{c|}{Body parts formed}
\hline A. & Intermediate Mesoderm & I. & Notochord
B. & Chorda Mesoderm & II. & Circulatory system
C. & Paraxial Mesoderm & III. & Kidney
D. & Lateral Plate Mesoderm & IV. & Skeletal Muscle
\hline \end{tabularx}
Choose the most appropriate answer from the options given below:

• A. A - I, B - II, C - III, D - IV
• B. A - III, B - I, C - IV, D - II
• C. A - II, B - IV, C - I, D - III
• D. A - IV, B - III, C - I, D - II

Hint:

Create a mental map of the mesoderm cross-section from the center outwards:

\textbf{Center/Axial (Chorda):} Notochord
\textbf{Next to center (Paraxial):} Somites (muscle, vertebrae)
\textbf{In between (Intermediate):} Kidneys/Gonads
\textbf{Outermost (Lateral Plate):} Circulatory system, Body cavity lining \end{itemize}

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
During embryonic development, the mesoderm, one of the three primary germ layers, differentiates into several distinct regions. Each region gives rise to specific tissues and organs in the adult body. This question tests knowledge of the derivatives of these mesodermal parts.

Step 2: Detailed Matching:
- A. Intermediate Mesoderm: This region is located between the paraxial and lateral plate mesoderm. It develops into the urogenital system, which includes the kidneys and gonads. Thus, A matches with III.
- B. Chorda Mesoderm: This is the axial mesoderm that runs along the midline of the embryo. It gives rise to the notochord, a key signaling center for the developing nervous system and vertebral column. Thus, B matches with I.
- C. Paraxial Mesoderm: This mesoderm is located on either side of the neural tube. It segments to form somites, which differentiate into the myotome (forming skeletal muscle), sclerotome (forming cartilage and bone of the vertebral column), and dermatome (forming the dermis of the skin). Thus, C matches with IV.
- D. Lateral Plate Mesoderm: This is the most lateral part of the mesoderm. It splits to form the lining of the body cavity (coelom). It gives rise to the heart, blood vessels, and blood cells of the circulatory system, as well as the smooth muscle of the gut and limb bones. Thus, D matches with II.

Step 3: Final Answer:
The correct pairings are A-III, B-I, C-IV, D-II. This corresponds to option (B).