Which of the following organisms does NOT show asexual reproduction by means of fission?
Earthworm
Understanding Fission Reproduction in Organisms
The question asks us to identify which organism from the given list does NOT reproduce using the method of fission. Fission is a common form of asexual reproduction, especially in single-celled organisms. It involves the parent organism dividing into two or more daughter cells.
Analyzing Organism Reproduction Methods
1. Leishmania
Leishmania is a protozoan parasite. It reproduces asexually, typically through binary fission. In binary fission, the organism elongates, and its nucleus divides, followed by the division of the cytoplasm, resulting in two identical daughter cells.
2. Plasmodium
Plasmodium is the parasite responsible for malaria. It also reproduces asexually. Within the host's red blood cells or liver cells, Plasmodium undergoes a process called multiple fission or schizogony. The nucleus divides multiple times first, followed by the division of the cytoplasm, creating numerous daughter cells (merozoites) simultaneously.
3. Earthworm
Earthworms are multicellular animals. Their primary mode of reproduction is sexual reproduction, involving distinct male and female reproductive systems (though many are hermaphrodites, cross-fertilization is common). While some organisms like flatworms can reproduce asexually through fragmentation and regeneration, earthworms do not reproduce by fission. Fission is characteristic of unicellular organisms dividing into parts.
4. Amoeba
Amoeba is a well-known example of a protozoan that reproduces via binary fission. The process is similar to that described for Leishmania, where the cell duplicates its contents and divides into two approximately equal halves.
Conclusion on Fission Reproduction
Based on the analysis of the reproductive methods:
- Leishmania: Reproduces by binary fission.
- Plasmodium: Reproduces by multiple fission.
- Amoeba: Reproduces by binary fission.
- Earthworm: Primarily reproduces sexually and does NOT reproduce by fission.
Therefore, the earthworm is the organism among the choices that does not exhibit reproduction by fission.
Similar Questions
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Important Questions from Reproduction
Cells of the tapetum possess dense cytoplasm and generally have ________.
Human chorionic gonadotropin:
Zygotes do not undergo reduction division immediately. They produce a multicellular body called a -
In organisms such as Amoeba, the splitting of the two cells during division can take place in _________
The pollen needs to be transferred from the stamen to the stigma. If this transfer of pollen occurs in the same flower, it is referred to as __________ . On the other hand, if the pollen is transferred from one flower to another, it is known as ______
