Chlorophyta reproduce both sexually and asexually, but usually sexually. Asexual reproduction can occurs by fission, fragmentation, or zoospores. Sexual reproduction can be isogamous, anisogamous, or oogamous. ... In the haploid phase, gametes are formed; in the diploid phase, zoospores are formed.

All the above options are because they are modes of reproduction
1) isogamy- in isogamy the fusion of gametes are morphologically but physiologically they might similar or dissimilar

2) anisogamy- the fusing gametes are dissimilar but physiologically they might similar or dissimilar

3) oogamy - in oogamy male gamete is small and motile while female gamete is large and non motile

The mode of sexual reproduction in chlorophyta, a division of green algae, includes three types: isogamy, anisogamy, and oogamy.

1. Isogamy:
- Isogamy is a type of sexual reproduction where the gametes (reproductive cells) involved are morphologically and functionally identical.
- In isogamy, both the male and female gametes are flagellated and have a similar size and shape.
- The fusion of isogametes results in the formation of a zygote, which further develops into a new individual.
- Examples of isogamous organisms in chlorophyta include some species of Chlamydomonas.

2. Anisogamy:
- Anisogamy involves the fusion of two morphologically distinct gametes.
- In anisogamy, the male gamete is typically smaller and motile, while the female gamete is larger and non-motile.
- The fusion of anisogametes also leads to the formation of a zygote that develops into a new individual.
- Some species of chlorophyta, such as species of Ulva, exhibit anisogamy.

3. Oogamy:
- Oogamy is a type of sexual reproduction where the male gamete is small and motile (called a sperm), while the female gamete is large and non-motile (called an egg or ovum).
- The male gamete, or sperm, is typically equipped with a flagellum for motility, while the female gamete, or egg, contains nutrients for the developing zygote.
- In oogamy, the sperm must swim to the egg to fertilize it.
- This type of reproduction is commonly observed in higher plants, including some green algae in chlorophyta.

In conclusion, the mode of sexual reproduction in chlorophyta includes isogamy, anisogamy, and oogamy. Isogamy involves the fusion of identical gametes, anisogamy involves the fusion of morphologically distinct gametes, and oogamy involves the fusion of a small motile gamete with a larger non-motile gamete. These different modes of reproduction allow for genetic diversity and adaptability within the chlorophyta division of green algae.