Sexual mode of reproduction in protozoa is

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Hint: Protozoa are single celled eukaryotes. They do not have a fixed shape. They are both free living and parasitic. They mode of reproduction in protozoa is mostly asexual mainly through binary fission but some protozoa reproduce sexually. An example of protozoa is amoeba.

Complete answer:
To solve this question, we must know about the sexual mode of reproduction in protozoa.
Protozoa mainly reproduce asexually but in some cases sexual reproduction is also seen which involves the exchange of genetic material through fusion of male and female gametes.

Let us discuss the given options.
Anisogamy: It involves fusion of gametes of different sizes. The small and motile gametes are male gametes and the large non-motile ones are the female gametes. This type of reproduction is seen in Plasmodium.
Plasmotomy: It is a mode of asexual reproduction in protozoa. In this multinucleate cells divide to form daughter cells without undergoing mitosis. The daughter cells are similar to that of the parent cell.
Autogamy: It involves the fusion of gametes produced by a single parent. It is also known as self fertilisation. It occurs mostly in plants.
Schizogony – It is a type of asexual reproduction in Protozoa. It is also called multiple fission.

Hence, the correct answer is option (A)

Note: Another mode of sexual reproduction in protozoa is by conjugation. It is the temporary union of the two gametes at the oral region. The diploid nucleus of the conjugant undergoes meiosis and four haploid micronuclei are formed. The three cells disappear and one divides by mitosis and forms two micronuclei.