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Standard IX
Biology
Nervous Tissue
Statement 1: ...
Question

Statement 1: Nervous tissue is made up of neurons that receive and conduct impulses.
Statement 2: Neurons are longest cells of the body and contains axon and cyton only.

A
Only statement 1 is correct
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B
Only statement 2 is correct
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C
Both the statements are correct
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D
Both the statements are incorrect
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Solution

The correct option is A Only statement 1 is correct
Nervous tissue is made up of neurons that are specialized in the reception, and transmission of impulses from one place to another in the body. Neurons are the longest cells of the body and contain axon, cyton and dendrites.

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Q. Nervous tissue is made up of neurons and neuroglial cells.
Which of the following statements about these two cells is/are false?
(i) Neuroglia makes up more than one-half of the volume of neural tissue in our body.
(ii) Neuroglia protects and supports neurons.
(iii) When a neuron is suitably stimulated, an electrical disturbance is generated which swiftly travels along its cytosol.
(iv) Arrival of the disturbance at the neuron's endings triggers stimulation or inhibition of adjacent neurons or other cells.
Q.

Consider the following statements. Which of them are true?

1. There are three main parts in a neuron - a cell body, an axon and dendrites.

2. The cytoplasm is thick here and contains granular substances called Nissl's bodies.

3. Branched processes termed dendrites arise from the cell body of a neuron.

4. All neurons have only one axon.


Q.

Differentiate between the following pairs with reference to the aspect in brackets.

(a) Cerebrum and cerebellum (function).

(b) Sympathetic nervous system and parasympathetic nervous system (overall effect on the body).

(c) Sensory nerve and motor nerve (direction of impulse carried).

(d) Medulla oblongata & Cerebellum (function).

(e) Cerebrum and spinal cord (arrangement of cytons and axons of neurons).

Q. Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
Q.

Match the following neurons with their criteria.

Column I Column II

i). Multipolar a. One axon and One dendrite

ii). Bipolar b. One axon and Several dendrites

iii). Unipolar c. One cell process that splits into two axons

iv). Pseudo Unipolar d. Cell body with One axon only


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