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ICSE Class 7 Biology Question 5 of 12

Nervous System — Question 8

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Question 4

A part of our nervous system is shown alongside. Study the same and answer the following questions :

A part of our nervous system is shown alongside. Study the same and answer the following questions : Concise Biology Solutions ICSE Class 7.
  1. Identify the figure and name it.
  2. Define the structure shown.
  3. Label the part shown as X.
  4. Write the name of the protective, tubular covering of the structure shown.
  5. Mention the names of the three kinds of the structure that is shown in the figure.
Answer

  1. The given figure shows a section of the Nerve.

  2. A nerve refers to a bundle of axons (nerve fibres) enclosed in a tubular medullary sheath, that act as a pathway for transmitting information between the brain and other parts of the body, enabling sensation and movement.

  3. The part "X" depicts Nerve fibres.

  4. The protective, tubular covering is the Myelin Sheath.

  5. Three kinds of nerves are:

    1. Sensory nerves
    2. Motor nerves
    3. Mixed nerves

Chapter 8: Human Body: Nervous System — ICSE Class VII Biology Notes

Comprehensive ICSE Class VII Biology notes on the Human Nervous System covering brain parts (cerebrum, cerebellum, medulla), spinal cord, neuron structure, reflex action, reflex arc, and voluntary vs involuntary actions.

Key Concepts and Topics

Topics covered: Brain, Spinal cord, Neurons, Reflex action, Reflex arc

Weightage: Approximately 8 marks in the exam

Important Points to Remember

  • CNS = brain + spinal cord; PNS = nerves
  • Brain parts: cerebrum (thinking), cerebellum (balance), medulla (involuntary)
  • Neuron: cell body + dendrites (receive) + axon (transmit)
  • Reflex action: automatic response controlled by spinal cord
  • Reflex arc: receptor to sensory nerve to spinal cord to motor nerve to effector
  • Brain protected by skull, meninges, and cerebrospinal fluid
  • Voluntary actions involve brain; reflex actions bypass brain

Frequently Asked Questions

Q: What is a reflex action?

A: A quick, automatic, involuntary response to a stimulus, controlled by the spinal cord without involving the brain.

Q: What are the three main parts of the brain?

A: Cerebrum (thinking), Cerebellum (balance), and Medulla oblongata (involuntary actions).

Q: What is a reflex arc?

A: The pathway of a reflex: Receptor → Sensory nerve → Spinal cord → Motor nerve → Effector.

Exam Preparation Tips

  • Focus on understanding concepts rather than rote memorization
  • Practice drawing and labelling diagrams regularly
  • Use comparison tables for topics that require differentiation
  • Solve previous year questions and practice papers
  • Review the chapter notes provided by Bright Tutorials for comprehensive coverage

For complete chapter notes, practice questions, and test papers, contact Bright Tutorials at 9403781999.