Animal Tissue Identification (Slides) MCQs Quiz | Class 9
This Class IX Science (Code 086) quiz focuses on Unit II: Practicals, specifically the identification of animal tissues. The questions cover key features and diagrammatic representations of striped/skeletal muscle, smooth muscle, cardiac muscle, and nerve cells. Test your understanding of their structure, location, and function, then submit your answers to review the results and download the PDF answer key for exam preparation.
Overview of Animal Tissues
Animal tissues are groups of cells that perform specific functions. In Class 9 Science practicals, students are expected to identify different types of muscular and nervous tissues based on their structural characteristics observed under a microscope. The primary focus is on distinguishing between skeletal, smooth, and cardiac muscles, as well as identifying the components of a nerve cell (neuron).
1. Muscular Tissue
Muscular tissue consists of elongated cells also called muscle fibers. This tissue is responsible for movement in our body.
A. Striated / Skeletal Muscle
- Structure: Long, cylindrical, unbranched fibers with alternate light and dark bands (striations).
- Nucleus: Multinucleated (many nuclei) located at the periphery of the fiber.
- Nature: Voluntary muscles (controlled by will).
- Location: Attached to bones, helping in body movement.
B. Smooth / Unstriated Muscle
- Structure: Spindle-shaped (tapered at both ends) with no striations.
- Nucleus: Uninucleated (single nucleus) located centrally.
- Nature: Involuntary muscles (not controlled by will).
- Location: Walls of internal organs like the stomach, intestines, iris of the eye, and bronchi of lungs.
C. Cardiac Muscle
- Structure: Cylindrical, branched, and faintly striated fibers. Features intercalated discs at junctions.
- Nucleus: Uninucleated and central.
- Nature: Involuntary and rhythmic contraction/relaxation throughout life.
- Location: Exclusively found in the heart.
2. Nervous Tissue (Neuron)
Nervous tissue is specialized for transmitting stimuli. The functional unit is the neuron.
- Cyton (Cell Body): Contains the nucleus and cytoplasm with Nissl granules.
- Dendrites: Short, branched projections that receive impulses.
- Axon: A single long fiber that transmits impulses away from the cell body. It may be covered by a myelin sheath.
- Nerve Ending: The terminal part of the axon where the impulse is passed to the next neuron or muscle.
Comparison of Muscle Types
| Feature | Skeletal | Smooth | Cardiac |
|---|---|---|---|
| Shape | Cylindrical | Spindle | Cylindrical |
| Nucleus | Many, peripheral | Single, central | Single, central |
| Control | Voluntary | Involuntary | Involuntary |
Quick Revision Points
- Skeletal muscles show alternate light and dark bands.
- Smooth muscles are unstriated and found in involuntary organs.
- Cardiac muscles are branched and never get fatigued.
- Neurons can be up to a meter long and are specialized for communication.
Extra Practice Questions
- Where are intercalated discs found? (Answer: Cardiac muscles)
- Which muscle tissue is multinucleated? (Answer: Skeletal muscle)
- What is the shape of smooth muscle cells? (Answer: Spindle-shaped)
- Name the long fiber of a neuron. (Answer: Axon)
- Which tissue is responsible for peristalsis in the intestine? (Answer: Smooth muscle)
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