Set 7: Central Ideas (Intermediate)
Explanation
PASSAGE
The following text describes a biological system. The nervous system is a highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body. In vertebrates it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord. The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body.
What are the two main parts of the vertebrate nervous system?
Detailed Explanation
This question asks you to identify the main point of the passage. Choice A is the best answer. The text states: 'In vertebrates it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS).' This matches Choice A.
Choice B is incorrect because it lists circulatory organs.
Choice C is incorrect because it mixes systems.
Choice D is incorrect because these are subdivisions, not the 'two main parts' listed. Remember that supporting details help prove the central idea but are not the main point themselves. The author's central idea should be broad enough to encompass the entire passage while still being specific enough to be meaningful. Ask yourself what the author most wants you to understand.
Key Evidence:
• "central nervous system (CNS) and the peripheral nervous system (PNS)"
Why others are wrong: B (Incorrect - wrong organs), C (Incorrect - wrong systems), D (Incorrect - subdivisions).
🎯 Keep Practicing!
Master all sections for your best SAT score