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The splitting of the two cells during division can take place in any plane. Such patterns of fission have been observed in which protozoan?
Leishmania
Amoeba
Hydra
Plasmodium
Amoeba
The protozoan Leishmania undergoes binary fission where the division of the cell occurs in a definite longitudinal orientation relative to its whip-like structure (flagellum). In contrast, organisms like Amoeba can perform binary fission in any plane because they lack a fixed anatomical orientation for division.
The protozoan Leishmania undergoes binary fission where the division of the cell occurs in a definite longitudinal orientation relative to its whip-like structure (flagellum). In contrast, organisms like Amoeba can perform binary fission in any plane because they lack a fixed anatomical orientation for division.
Think of cutting a long, shaped baguette (like Leishmania, which has a specific top and bottom) тАФ you must cut it length-wise to keep the shape, versus a ball of dough (like Amoeba), which you can slice through the center at any angle to get two roughly equal pieces.
Binary fission is an asexual reproduction method where a single parent cell divides into two identical daughter cells. In Leishmania, the presence of an organized structure (like the flagellum) dictates a specific longitudinal plane of cleavage to ensure both daughter cells receive the necessary organelles. In Amoeba, the cell's lack of a fixed shape allows it to constrict and pinch off into two halves regardless of the direction of the cleavage furrow.
Binary fission is the primary method of reproduction in unicellular organisms.
Leishmania is the causative agent of Kala-azar (leishmaniasis).
Orientation of the cleavage furrow is determined by the internal structural organization of the organism.
Rapid multiplication of population.
Requires only one parent (asexual reproduction).
Low genetic diversity among offspring compared to sexual reproduction.
Biological study of asexual reproduction.
Understanding the life cycle of pathogenic parasites.
| Feature | Leishmania | Amoeba |
|---|---|---|
Plane of Division | Longitudinal | Any plane |
Amoeba is a classic example of irregular binary fission.
Option A (Leishmania) divides longitudinally, fitting the description of specific organisms with whip-like structures.
Option C (Hydra) reproduces via budding, not binary fission.
Option D (Plasmodium) reproduces via multiple fission.
B is correct тАФ Amoeba is the protozoan where the splitting of the cell during binary fission can take place in any plane due to its irregular body shape.
Always link the organism's morphology (shape) to its mode of reproduction: irregular shapes (Amoeba) allow for 'any plane' division, while structured shapes (Leishmania) demand specific orientation.
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