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
| 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 |
More WBBSE Moderate level questions
Write the name of the chemical constituents of eukaryotic chromosome with the help of a table. What happens to a cell when the cell loses control at different points in cell cycle on division ? [3+2=5] OR What events occur during Anaphase stage of mitotic cell division ?Show the steps of sexual reproduction of flowering plants with the help of word diagram. [3+2=5]
Draw a scientific diagram of neuron and label the following parts: [3+2=5] (a) Dendron (b) Myelin Sheath (c) Schwann Cell (d) Node of Ranvier OR Draw a scientific diagram of eukaryotic chromosome and label the following parts: [3+2=5] (a) Centromere (b) Satellite (c) Nucleolar Organizer (d) Telomere
How does the Cytokinesis of plant cell happen?
Which reflex actions does a spectator execute while watching a high voltage game on television?
Compare between Myopia and Hyperopia on the following two features: (a) Cause (b) Symptom
Mitotic cell division occurs while producing haploid spores.
Spindle fibres and chromosomes are not formed in the ____ cell division.
The nucleated oval ____ cells occur between Medullary Sheath and Neurilemma of the axon of a neurone.
In a certain phase of mitosis nuclear reticulum is reconstructed, nuclear membrane reappears, regeneration of nucleolus takes place and Spindle fibre disappears. What is the phase? (a) Prophase (b) Telophase (c) Metaphase (d) Anaphase
Consider the differences between hormone and nervous system mentioned below and choose which ones are correct: Hormone Nervous System I. Hormone is physical coordinator Nervous system is chemical coordinator II. The function of hormone occurs at a slow pace The function of nervous system is quick and instant III. The effect of hormone is long lasting The effect of nervous system is short lasting IV. Hormone remains unchanged after its function is over Nervous system gets destroyed after its function is over Options: (a) I, IV (b) I, III (c) II, III (d) II, IV
Choose the correct pair from the following: (a) Lens - Accomplishes accommodation by changing the curvature of its plane (b) Retina - Holds the lens with the help of the suspensory ligament (c) Cornea - Secretes aqueous humor (d) Choroid - Helps to maintain the shape of the eyeball
Explain the following three significances of cell division- Growth Repair Reproduction Tabulate the site of occurrences of meiotic cell division in the living world. [3+2=5] OR Explain the process of micropropagation. Distinguish between asexual and sexual reproduction on the basis of the following three features - No. of Parental organisms Cell Division Origin of variation [2+3=5]
