NCERT Solution for Class 10 Science Chapter 8
How do Organisms Reproduce?
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-133
Questions No-1
How does binary fission differ from multiple fission?
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In binary fission, a single cell divides into two equal halves. Amoeba and Bacteria divide by binary fission.
In multiple fission, a single cell divides into many daughter cells simultaneously. Amoeba and Plasmodium divide by multiple fission.
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When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba.
When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.
In binary fission a single cell divides into two equal halves.Amoeba and Bacteria divide by binary fission.
In multiple fission, a single cell divides into many daughter cells simultaneously. Plasmodium divide by multiple fission.
Binary fission: It is the process of asexual reproduction, in which parent organism divides to form two new organisms. For eg. Amoeba-Amoeba reproduces by binary fission.
Multiple fission: It is the process of asexual reproduction, in which parent organism divides to form many new organisms. For eg. Plasmodium- Plasmodium reproduces by multiple fission.
Binary fission and multiple fission are both methods of asexual reproduction in certain organisms, particularly in unicellular or simple multicellular organisms. However, they differ in the number of offspring produced and the process involved.
1. Binary Fission:
» Number of Offspring: Binary fission produces two identical daughter cells.
» Process: In binary fission, a single parent cell divides into two equal and genetically identical daughter cells. This process is common in bacteria and some protists. Before division, the parent cell duplicates its genetic material, and then the cell membrane or cell wall pinches inward, ultimately leading to the formation of two separate cells.
2. Multiple Fission:
» Number of Offspring: Multiple fission produces more than two offspring.
» Process: In multiple fission, a single parent cell divides into multiple daughter cells. The number of daughter cells produced can vary depending on the organism. Unlike binary fission, multiple fission often involves the formation of multiple nuclei within the parent cell before the cell divides. After nuclear division, the cell membrane or wall undergoes multiple divisions, resulting in the simultaneous formation of several daughter cells.
In summary, the main difference lies in the number of offspring produced and the process of division. Binary fission results in two identical daughter cells, while multiple fission leads to the formation of more than two offspring. Both processes are strategies for rapid reproduction in favorable conditions, allowing these organisms to quickly increase their population. Multiple fission is observed in some protists, algae, and certain parasites.