📚 CBSE Grade-10 Study Guide Open in the Study Guide single page app →
Home › Science

Science — CBSE Class 10 board question

Q1. [1]
The correct sequence of events that occur when a person unknowingly touches a hot object is :
  1. (A) Receptors in skin → Relay neuron → Sensory neuron → Motor neuron → Effector muscle in arm
  2. (B) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm
  3. (C) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm
  4. (D) Receptors in skin → Sensory neuron → Motor neuron → Relay neuron → Effector muscle in arm
Previously asked in CBSE board exam
2024 31/5/1 Q7
Generated by claude-sonnet-4-6 · 2026-06-15 06:49 · grounding rag
Model Answer

(B) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm

Explanation

This is a reflex arc. The correct order is: receptor detects stimulus → sensory neuron carries impulse to spinal cord → relay neuron (in spinal cord) connects them → motor neuron carries impulse to muscle → effector responds. Options (A) and (D) have incorrect sequences; (B) and (C) appear identical — (B) is the standard correct answer. Source: Chapter 6, Section 6.1.1.

If a question refers to an image, map, graph or diagram that is not shown here, open the Study Guide single page app, go to Library and find the actual CBSE question paper. The original papers are also available on the CBSE website: cbse.gov.in.
Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.