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ICSE Class 7 Biology Question 8 of 12

Nervous System — Question 11

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Question

Question 3

Correct the following statements by changing the first and the last word only :

  1. Cerebrum maintains the balance of the body.
  2. The long process which extends from the cell body of a neuron is termed as a dendron.
  3. Enzymes regulate chemical coordination of the body.
  4. Motor neurons carry impulses from the sense organs to the central nervous system.
  5. Spinal cord regulates the heart beat and breathing movements.
Answer

  1. Cerebellum maintains the balance of the body.

  2. The long process which extends from the cell body of a neuron is termed as an axon.

  3. Hormones regulate chemical coordination of the body.

  4. Sensory neurons carry impulses from the sense organs to the central nervous system.

  5. Medulla oblongata regulates the heart beat and breathing movements.

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.