Write one function each of the following five parts of a neuron: [1×5=5]
(a) Dendron
(b) Axon
(c) Myelin Sheath
(d) Schwann Cell
(e) Node of Ranvier
Or
Write one function each of the following five parts of an eukaryotic chromosome: [1×5=5]
(a) Chromatid
(b) Centromere
(c) Nucleolar Organizer
(d) Satellite
(e) Telomere
WBBSE
Class X
Life Science
01 (d) Nervous System
02 (a) Cell Division and Cell Cycle
5
2024
| Part of Neuron | Function |
|---|---|
| Dendron | Receives signals from other neurons |
| Axon | Conducts nerve impulses away from the cell body |
| Myelin Sheath | Insulates axon and speeds up nerve impulse transmission |
| Schwann Cell | Produces the myelin sheath |
| Node of Ranvier | Enables rapid nerve impulse conduction (saltatory conduction) |
Or
| Part of Chromosome | Function |
|---|---|
| Chromatid | Contains DNA and transmits genetic information |
| Centromere | Joins chromatids and attaches spindle fibers during cell division |
| Nucleolar Organizer | Forms the nucleolus and synthesizes ribosomal RNA |
| Satellite | Contains nucleolar organizer regions |
| Telomere | Protects chromosome ends from deterioration or fusion |
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