Multiple Choice
Which of the following best describes the primary focus of biology as a scientific discipline?
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1. Introduction to Biology
Introduction to Biology
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Which of the following structures is primarily derived from the ectoderm germ layer?
A
The kidneys
B
The nervous system
C
The lining of the digestive tract
D
The muscles
Verified step by step guidance1
Understand the concept of germ layers: During embryonic development, three primary germ layers form—ectoderm, mesoderm, and endoderm. Each layer gives rise to specific tissues and organs in the body.
Focus on the ectoderm: The ectoderm is the outermost germ layer. It primarily gives rise to structures such as the nervous system, epidermis (skin), hair, nails, and sensory organs.
Analyze the options: Review each option and determine which structure is derived from the ectoderm. For example, the nervous system is derived from the ectoderm, while the kidneys and muscles are derived from the mesoderm, and the lining of the digestive tract is derived from the endoderm.
Eliminate incorrect options: Based on the germ layer derivations, eliminate options that are not associated with the ectoderm. This leaves the nervous system as the correct answer.
Conclude: The nervous system is primarily derived from the ectoderm germ layer, as it develops from the neural tube, which originates from ectodermal tissue.
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