Binary Fission in Amoeba (Slide Study) MCQs Quiz | Class 10
This quiz covers important concepts from Class X Science (Code 086), Unit II: Practicals, focusing on the Topic: Binary Fission in Amoeba (Slide Study) MCQs Quiz | Class 10. You will be tested on identification and key features of this biological process. Complete the quiz by selecting your answers and then click ‘Submit Quiz’ to see your score. Don’t forget to download the Answer PDF for future reference!
Understanding Binary Fission in Amoeba
Binary fission is a fundamental process of asexual reproduction, commonly observed in single-celled organisms like Amoeba. It is a simple and efficient method where a single parent organism divides into two genetically identical daughter organisms. This process is crucial for the rapid multiplication of Amoebae, especially under favorable environmental conditions.
Key Features of Binary Fission in Amoeba:
- Asexual Reproduction: Involves only one parent, producing offspring that are genetically identical to the parent.
- Rapid Process: Allows for quick population growth.
- Favorable Conditions: Typically occurs when food and environmental conditions are optimal.
- Two Main Stages: Consists of Karyokinesis (nuclear division) followed by Cytokinesis (cytoplasmic division).
- Genetically Identical Offspring: The two daughter Amoebae are clones of the parent.
Stages of Binary Fission (Slide Study Focus):
When studying binary fission under a microscope, observe the following stages:
- Nucleus Elongation: The single nucleus of the parent Amoeba begins to elongate and stretch, often appearing dumbbell-shaped. This is the first visible sign of an impending division.
- Karyokinesis (Nuclear Division): The elongated nucleus divides into two distinct daughter nuclei. This division is a simpler, mitosis-like process, ensuring that each new nucleus receives a complete set of genetic material.
- Cytokinesis (Cytoplasmic Division): Following nuclear division, the cytoplasm of the parent cell starts to constrict in the middle. This constriction deepens, gradually pinching the cell into two.
- Formation of Daughter Amoebae: Eventually, the parent cell completely separates into two individual, smaller daughter Amoebae. Each daughter cell contains one nucleus, along with its share of cytoplasm and organelles, and is capable of independent existence and growth.
Identification Points on Slides:
When observing prepared slides, look for:
- Single Amoeba cells in various stages of division.
- Amoebae with an elongated or dumbbell-shaped nucleus.
- Amoebae showing clear constriction in their cytoplasm.
- Pairs of newly separated, smaller Amoeba cells.
Summary Table: Binary Fission in Amoeba
| Feature | Description |
|---|---|
| Type of Reproduction | Asexual |
| Parent Cells Involved | One |
| Daughter Cells Produced | Two |
| Genetic Similarity | Identical to parent |
| Key Processes | Karyokinesis (nuclear division), Cytokinesis (cytoplasm division) |
| Conditions | Favorable |
Quick Revision Points:
- Binary fission is the primary mode of reproduction for Amoeba.
- It starts with the division of the nucleus (karyokinesis).
- It is followed by the division of the cytoplasm (cytokinesis).
- The result is two genetically identical daughter Amoebae.
- It ensures rapid propagation under suitable conditions.
Further Practice Questions:
- What term specifically describes the division of the cytoplasm during binary fission?
- Is binary fission an example of sexual or asexual reproduction?
- How do the two daughter Amoebae compare in terms of genetic material to each other?
- Name one environmental condition that promotes binary fission in Amoeba.
- What happens to the parent Amoeba cell after binary fission is complete?
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