The 'Neuron' or nerve cell consists of which of the following parts? 1. Cell body with a nucleus 2. The axon is absent in human nerve cells. 3. Dendrites are responsible for secreting hormones. Select the correct answer using the code given below:

The correct option is (a). Explanation The neuron (nerve cell) is the fundamental structural and functional unit of the nervous system. It is specialized to detect, receive, and transmit information through electrical and chemical signals across the body. Statement-wise Analysis - Statement 1 is Correct: A neuron consists of a main part called the cell body (soma or cyton), which contains the nucleus and typical cell organelles suspended in the cytoplasm. This region is responsible for maintaining the cell and integrating incoming signals. - Statement 2 is Incorrect: The axon is a single, long, cylindrical projection that extends from the cell body. Its primary function is to conduct nerve impulses away from the cell body to other neurons, muscles, or glands. Axons are a defining feature of human nerve cells. - Statement 3 is Incorrect: Dendrites are short, branched fibers projecting from the cell body. Their function is to receive electrochemical signals from other neurons and transmit them towards the cell body. They are not responsible for secreting hormones; hormone secretion is generally the function of endocrine glands or specialized neurosecretory terminals at the end of axons. Key Takeaway A typical neuron comprises three distinct parts: dendrites (receive signals), the cell body (contains the nucleus), and the axon (transmits impulses away). Axons are present in human neurons.

The 'Neuron' or nerve cell consists of… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Tissues

mcqeasy

The 'Neuron' or nerve cell consists of which of the following parts?

Cell body with a nucleus
The axon is absent in human nerve cells.
Dendrites are responsible for secreting hormones.

Select the correct answer using the code given below:

NCERT textbook question

From NCERT Science - class 9 · Page 69

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

The neuron (nerve cell) is the fundamental structural and functional unit of the nervous system. It is specialized to detect, receive, and transmit information through electrical and chemical signals across the body.

Statement-wise Analysis

Statement 1 is Correct: A neuron consists of a main part called the cell body (soma or cyton), which contains the nucleus and typical cell organelles suspended in the cytoplasm. This region is responsible for maintaining the cell and integrating incoming signals.
Statement 2 is Incorrect: The axon is a single, long, cylindrical projection that extends from the cell body. Its primary function is to conduct nerve impulses away from the cell body to other neurons, muscles, or glands. Axons are a defining feature of human nerve cells.
Statement 3 is Incorrect: Dendrites are short, branched fibers projecting from the cell body. Their function is to receive electrochemical signals from other neurons and transmit them towards the cell body. They are not responsible for secreting hormones; hormone secretion is generally the function of endocrine glands or specialized neurosecretory terminals at the end of axons.

Key Takeaway

A typical neuron comprises three distinct parts: dendrites (receive signals), the cell body (contains the nucleus), and the axon (transmits impulses away). Axons are present in human neurons.

Your note

More from Chapter 2: Tissues

Consider the following statements regarding 'Complex Permanent Tissues': 1. They are made of more than one type of cell. 2. Each cell in the tissue functions independently without coordination. 3. Xylem and Phloem are examples of complex tissues. Which of the statements given above is/are correct?

medium

Consider the following statements about epithelial tissue: 1. It forms a barrier to keep different body systems separate. 2. It is directly connected to the underlying tissue without any separating membrane. 3. It contains large intercellular spaces to facilitate the movement of materials. Which of the statements given above is/are correct?

medium

Consider the following statements about 'Smooth Muscles': 1. They are also known as striated muscles. 2. They control involuntary movements like the movement of food in the alimentary canal. 3. They are multinucleate. Which of the statements given above are correct?

medium

With reference to the fundamental differences between plants and animals, consider the following statements: 1. Plants have a large quantity of supportive tissue which generally consists of dead cells. 2. Growth in plants is uniform throughout the body, whereas in animals it is limited to specific regions. 3. Animals consume more energy compared to plants due to active locomotion. Which of the statements given above is/are correct?

medium

Which one of the following is the most appropriate reason for the skin being made of 'Stratified Squamous Epithelium'?

easy

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