SAT Subject Biology Practice Question 313: Answer and Explanation

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Question: 313

3.

From which of the primary germ layers does the nervous system develop?

A. Endoderm
B. Mesoderm
C. Ectoderm
D. Enteroderm
E. Epidermis

Correct Answer: C

Explanation:

C You should remember the prefixes ecto, meso, and endo for the primary germ layers and therefore eliminate choices D and E right away. The ectoderm forms the skin, hair, nails, mouth lining, and nervous system. The mesoderm forms muscle, bone, blood vessels, and organs (B is wrong). The endoderm forms inner linings and glands (A is wrong).

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