{"id":85370,"date":"2025-06-01T03:14:49","date_gmt":"2025-06-01T03:14:49","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85370"},"modified":"2025-06-01T03:14:49","modified_gmt":"2025-06-01T03:14:49","slug":"reflex-arcs-are-evolved-in-animals-for-quick-and-efficient-responses","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/reflex-arcs-are-evolved-in-animals-for-quick-and-efficient-responses\/","title":{"rendered":"Reflex arcs are evolved in animals for quick and efficient responses."},"content":{"rendered":"

Reflex arcs are evolved in animals for quick and efficient responses. Which one of the following sequences correctly represents a reflex arc?<\/p>\n

[amp_mcq option1=”Receptor\u2014Sensory neuron\u2014Relay neuron in spinal cord\u2014Brain\u2014Motor neuron\u2014Effector” option2=”Receptor\u2014Sensory neuron\u2014Brain\u2014Relay neuron in spinal cord\u2014Motor neuron\u2014Effector” option3=”Receptor\u2014Motor neuron\u2014Relay neuron in spinal cord\u2014Sensory neuron\u2014Effector” option4=”Receptor\u2014Motor neuron\u2014Brain\u2014Sensory neuron\u2014Effector” correct=”option1″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CDS-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
A reflex arc is the pathway followed by nerve impulses during a reflex action. The typical sequence involves a Receptor detecting the stimulus, a Sensory neuron transmitting the signal to the central nervous system (spinal cord), an interneuron (Relay neuron) in the spinal cord processing the signal and synapsing with a Motor neuron, which carries the command to an Effector (muscle or gland) to produce a response. While simple spinal reflexes occur without conscious brain processing for the motor response, the sensory information is often simultaneously transmitted to the brain. Option A, despite including ‘Brain’ in the serial path (which is not how a simple spinal reflex motor command originates), is the only option that correctly orders the initial steps (Receptor -> Sensory neuron) and subsequent components (Relay neuron in spinal cord, Motor neuron, Effector) in a biologically plausible sequence among the given choices, relative to the flow of information and action.<\/section>\n
The fundamental components of a reflex arc are Receptor, Sensory neuron, Integration center (often involving interneurons in the spinal cord), Motor neuron, and Effector. The speed of reflex action is due to the short pathway, often bypassing higher brain centers for the rapid motor command.<\/section>\n
Reflex arcs can be monosynaptic (one synapse between sensory and motor neuron) or polysynaptic (involving one or more interneurons).<\/section>\n","protected":false},"excerpt":{"rendered":"

Reflex arcs are evolved in animals for quick and efficient responses. Which one of the following sequences correctly represents a reflex arc? [amp_mcq option1=”Receptor\u2014Sensory neuron\u2014Relay neuron in spinal cord\u2014Brain\u2014Motor neuron\u2014Effector” option2=”Receptor\u2014Sensory neuron\u2014Brain\u2014Relay neuron in spinal cord\u2014Motor neuron\u2014Effector” option3=”Receptor\u2014Motor neuron\u2014Relay neuron in spinal cord\u2014Sensory neuron\u2014Effector” option4=”Receptor\u2014Motor neuron\u2014Brain\u2014Sensory neuron\u2014Effector” correct=”option1″] This question was previously asked in UPSC … <\/p>\n

Detailed SolutionReflex arcs are evolved in animals for quick and efficient responses.<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1087],"tags":[1105,1117,1351],"class_list":["post-85370","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1105","tag-biology","tag-nervous-system","no-featured-image-padding"],"yoast_head":"\nReflex arcs are evolved in animals for quick and efficient responses.<\/title>\n<meta name=\"description\" content=\"A reflex arc is the pathway followed by nerve impulses during a reflex action. The typical sequence involves a Receptor detecting the stimulus, a Sensory neuron transmitting the signal to the central nervous system (spinal cord), an interneuron (Relay neuron) in the spinal cord processing the signal and synapsing with a Motor neuron, which carries the command to an Effector (muscle or gland) to produce a response. While simple spinal reflexes occur without conscious brain processing for the motor response, the sensory information is often simultaneously transmitted to the brain. Option A, despite including 'Brain' in the serial path (which is not how a simple spinal reflex motor command originates), is the only option that correctly orders the initial steps (Receptor -> Sensory neuron) and subsequent components (Relay neuron in spinal cord, Motor neuron, Effector) in a biologically plausible sequence among the given choices, relative to the flow of information and action. The fundamental components of a reflex arc are Receptor, Sensory neuron, Integration center (often involving interneurons in the spinal cord), Motor neuron, and Effector. The speed of reflex action is due to the short pathway, often bypassing higher brain centers for the rapid motor command.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/reflex-arcs-are-evolved-in-animals-for-quick-and-efficient-responses\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reflex arcs are evolved in animals for quick and efficient responses.\" \/>\n<meta property=\"og:description\" content=\"A reflex arc is the pathway followed by nerve impulses during a reflex action. The typical sequence involves a Receptor detecting the stimulus, a Sensory neuron transmitting the signal to the central nervous system (spinal cord), an interneuron (Relay neuron) in the spinal cord processing the signal and synapsing with a Motor neuron, which carries the command to an Effector (muscle or gland) to produce a response. While simple spinal reflexes occur without conscious brain processing for the motor response, the sensory information is often simultaneously transmitted to the brain. Option A, despite including 'Brain' in the serial path (which is not how a simple spinal reflex motor command originates), is the only option that correctly orders the initial steps (Receptor -> Sensory neuron) and subsequent components (Relay neuron in spinal cord, Motor neuron, Effector) in a biologically plausible sequence among the given choices, relative to the flow of information and action. The fundamental components of a reflex arc are Receptor, Sensory neuron, Integration center (often involving interneurons in the spinal cord), Motor neuron, and Effector. The speed of reflex action is due to the short pathway, often bypassing higher brain centers for the rapid motor command.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/reflex-arcs-are-evolved-in-animals-for-quick-and-efficient-responses\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:14:49+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Reflex arcs are evolved in animals for quick and efficient responses.","description":"A reflex arc is the pathway followed by nerve impulses during a reflex action. 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The typical sequence involves a Receptor detecting the stimulus, a Sensory neuron transmitting the signal to the central nervous system (spinal cord), an interneuron (Relay neuron) in the spinal cord processing the signal and synapsing with a Motor neuron, which carries the command to an Effector (muscle or gland) to produce a response. While simple spinal reflexes occur without conscious brain processing for the motor response, the sensory information is often simultaneously transmitted to the brain. Option A, despite including 'Brain' in the serial path (which is not how a simple spinal reflex motor command originates), is the only option that correctly orders the initial steps (Receptor -> Sensory neuron) and subsequent components (Relay neuron in spinal cord, Motor neuron, Effector) in a biologically plausible sequence among the given choices, relative to the flow of information and action. 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