Question

Which one of the following organisms does not reproduce by fission?
A. Planaria
B. Plasmodium
C. Amoeba
D. Paramecium

Answer 1

Hint: Binary fission is asexual reproduction in which the body is split into two new bodies. Binary fission occurs when an organism copies its genetic material, or deoxyribonucleic acid (DNA), and then divides into two halves (cytokinesis), each obtaining one copy of DNA.

Complete answer:
Plasmodium divides via multiple fission, whereas Amoeba and Paramecium divide by binary fission.
Planaria reproduce by fragmentation, or breaking up into many pieces. In multicellular organisms, fragmentation is a method of asexual reproduction or cloning in which an organism is broken into fragments. Each of these fragments develops into a fully formed individual who is a clone of the original creature.

As a result, the correct answer is option (A)Planaria.

The reproductive cycle in which several individuals are generated or created from a single parent cell is known as multiple fission. The nucleus divides frequently in this approach, resulting in a large number of nuclei. A small amount of cytoplasm is absorbed by each nucleus, which forms a membrane around each structure. The dimensions of all the offspring cells are similar and identical. Plasmodium is the organism that causes multiple fission.

Fragmentation is the name given to one of the recognised asexual reproductive types. It is a sort of cloning in which one organism is fragmented into minor fragments, as the name implies. After being separated, these fragments mature into fully developed individuals.

Many organisms, including cyanobacteria, fungi, and many plants, as well as animals such as flatworms, sponges, and some annelid worms and sea stars, use fragmentation as a mode of reproduction.

Fragmentation is the most common type of asexual reproduction in plants. Plants use fragmentation as a method of vegetative reproduction. When a rooted branch separates from the main group, it is called fragmentation. There are a variety of additional mechanisms in plants. There are a number of different natural fragmentation processes in plants that have been discovered.

Note:-
fragmentation in animals, Coral colonies and sponges, for example, experience natural fragmentation and reproduction. Different species of coral and sponge colonies reproduce via this strategy. This mode of reproduction is used by a variety of annelid species and flatworms.