Consider the following statements about 'Nervous Tissue': 1. It is highly specialised for transmitting stimuli rapidly. 2. Nerve cells are microscopic and never exceed a few millimetres in length. 3. Nerve impulses allow animals to move muscles in response to stimuli. Which of the statements given above are correct?

The correct option is (c). Explanation Nervous tissue is the primary component of the nervous system, consisting of neurons (nerve cells) and supporting cells. It is responsible for sensing stimuli and transmitting signals to coordinate bodily functions. Statement-wise Analysis: - Statement 1 is Correct: Nervous tissue is highly specialized for excitability and conductivity. It receives stimuli and transmits electrochemical signals (impulses) rapidly from one part of the body to another to facilitate quick responses. - Statement 2 is Incorrect: While the cell body of a neuron is microscopic, the axon (the projection that carries impulses) can be very long. Some nerve cells in the human body can be up to a meter in length (e.g., neurons extending from the spinal cord to the toes). Therefore, they are not limited to a few millimeters. - Statement 3 is Correct: The functional integration of nerve and muscle tissue is fundamental to animal physiology. Nerve impulses trigger muscle contraction, enabling animals to perform voluntary and involuntary movements in response to stimuli. Key Takeaway: Neurons are specialized for rapid signal transmission and are structurally unique; unlike most cells, they can be exceptionally long (up to a meter) to connect distant parts of the body.

Consider the following statements about 'Nervous Tissue': 1.… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Tissues

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Consider the following statements about 'Nervous Tissue':

It is highly specialised for transmitting stimuli rapidly.
Nerve cells are microscopic and never exceed a few millimetres in length.
Nerve impulses allow animals to move muscles in response to stimuli.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 9 · Page 68

Options

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

Did you get this right?

Solution

The correct option is (c).

Explanation

Nervous tissue is the primary component of the nervous system, consisting of neurons (nerve cells) and supporting cells. It is responsible for sensing stimuli and transmitting signals to coordinate bodily functions.

Statement-wise Analysis:

Statement 1 is Correct: Nervous tissue is highly specialized for excitability and conductivity. It receives stimuli and transmits electrochemical signals (impulses) rapidly from one part of the body to another to facilitate quick responses.
Statement 2 is Incorrect: While the cell body of a neuron is microscopic, the axon (the projection that carries impulses) can be very long. Some nerve cells in the human body can be up to a meter in length (e.g., neurons extending from the spinal cord to the toes). Therefore, they are not limited to a few millimeters.
Statement 3 is Correct: The functional integration of nerve and muscle tissue is fundamental to animal physiology. Nerve impulses trigger muscle contraction, enabling animals to perform voluntary and involuntary movements in response to stimuli.

Key Takeaway:
Neurons are specialized for rapid signal transmission and are structurally unique; unlike most cells, they can be exceptionally long (up to a meter) to connect distant parts of the body.

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?

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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?

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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?

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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?

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

easy

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