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Class 9  »  Biology  »  Tissues

Nervous Tissue - UNSOLVED PRACTICE SET

Class 9

Chapter: Tissues | Topic: Nervous Tissue Neuron Structure

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Class 9

NERVOUS TISSUE - UNSOLVED PRACTICE SET

Topic: Nervous Tissue Neuron Structure

Time: 45 mins | Marks: 27 | Difficulty: Medium

Multiple Choice Questions

Q1. The functional unit of the nervous system is:

  1. The brain
  2. The neuron
  3. The spinal cord
  4. The nerve

Q2. The long fibre that carries impulses away from the cell body of a neuron is called:

  1. Dendrite
  2. Axon
  3. Cyton
  4. Synapse

Q3. The gap between two neurons where the nerve impulse is transmitted is called:

  1. Dendrite
  2. Axon
  3. Synapse
  4. Myelin sheath

Q4. The cell body of a neuron is also called:

  1. Dendrite
  2. Axon
  3. Cyton or soma
  4. Synaptic knob

Q5. The fatty layer that covers some axons and speeds up nerve impulse transmission is called:

  1. Dendrite
  2. Myelin sheath
  3. Synapse
  4. Neurolemma

Short Answer Questions

Q6. Draw a well-labelled diagram of a neuron and label the following parts: cell body (cyton), dendrites, axon, myelin sheath, and synaptic knob.

Q7. Differentiate between dendrites and axons in terms of structure, function, and the direction of impulse transmission.

Q8. What is a synapse? Explain how a nerve impulse is transmitted across a synapse from one neuron to another.

Q9. Why are neurons considered "excitable cells"? What special property allows them to conduct electrical impulses?

Long Answer Questions

Q10. Describe the structure of a neuron in detail. Explain how each part - dendrites, cell body, axon, and synaptic knob -contributes to the transmission of nerve impulses.

Q11. Explain the structure and function of the myelin sheath. How does it help in faster transmission of nerve impulses? What happens when the myelin sheath is damaged?

APPLICATION / ANALYSIS

Q12. Multiple sclerosis (MS) is a disease in which the myelin sheath around neurons in the brain and spinal cord is damaged.

(a) How would damage to the myelin sheath affect the speed of nerve impulse transmission? Explain.

(b) A person with MS experiences muscle weakness and difficulty in coordination. Why do these symptoms occur?

(c) Currently, there is no cure for MS, but treatments can slow its progression. Why is it difficult to repair damaged myelin sheaths in the nervous system?

Q13. During a biology practical, a student observes a neuron under a microscope and notices:

• A star-shaped cell body with many branching extensions

• One very long, unbranched fibre extending from the cell body

• A fatty covering around the long fibre

(a) Identify the parts of the neuron described above.

(b) The student learns that some neurons in the body can be over 1 metre long (e.g., from the spinal cord to the toes). How is the structure of these long neurons adapted for efficient impulse transmission?

(c) A student argues: "Neurons are the longest cells in the human body." Do you agree? Give reasons with examples.


Total: 27 Marks | Time: 45 mins

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