Directions: In the following questions, a statement of assertion (A) ...
Multiple fission is the process of asexual reproduction in which instead of 2 daughter cells, many daughter cells are produced from the parent cell. In this, the nucleus undergoes repeated division to produce a large number of nuclei. Each nucleus along with a little bit of cytoplasm forms a membrane around it. All the daughter cells are equal sized and are similar. Plasmodium, true slime molds (Myxomycetes) exhibit this type of asexual reproduction.
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Directions: In the following questions, a statement of assertion (A) ...
Assertion: Plasmodium reproduces by multiple fission.
Reason: Multiple fission is a type of asexual reproduction.
Explanation:
Plasmodium is a type of protozoan parasite that causes malaria. It undergoes a process called multiple fission, which is a type of asexual reproduction.
Multiple Fission:
Multiple fission is a form of asexual reproduction in which an organism divides into multiple daughter cells simultaneously. In the case of Plasmodium, it undergoes multiple fission during its life cycle.
Life Cycle of Plasmodium:
1. The life cycle of Plasmodium involves two hosts - a mosquito and a human.
2. When an infected mosquito bites a human, it injects sporozoites (the infective stage of Plasmodium) into the bloodstream.
3. The sporozoites travel to the liver and enter the liver cells, where they undergo asexual reproduction by multiple fission.
4. During multiple fission, each sporozoite divides multiple times to form a large number of merozoites.
5. The merozoites are released from the liver cells and enter the bloodstream, where they infect red blood cells.
6. Inside the red blood cells, the merozoites undergo further asexual reproduction by multiple fission, resulting in the release of more merozoites.
7. This cycle of asexual reproduction continues, leading to the destruction of red blood cells and the symptoms of malaria.
8. Some of the merozoites differentiate into male and female gametocytes, which can be taken up by a mosquito during a blood meal.
9. Inside the mosquito, the gametocytes undergo sexual reproduction, resulting in the formation of zygotes.
10. The zygotes develop into motile forms called ookinetes, which penetrate the mosquito's midgut wall and develop into oocysts.
11. The oocysts undergo sporogony, producing thousands of sporozoites that migrate to the mosquito's salivary glands.
12. When the mosquito bites a human again, it injects the sporozoites into the bloodstream, starting the cycle anew.
Conclusion:
Both the assertion and the reason are true. Plasmodium does reproduce by multiple fission, and multiple fission is indeed a type of asexual reproduction. However, the reason alone does not fully explain the assertion, as there are other types of asexual reproduction as well. Therefore, option B is the correct choice.
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