Biology · PLANT KINGDOM

Consider three green algae: Ulothrix, Spirogyra, and Volvox. Which statement accurately compares their sexual gametes in terms of motility, size, and flagellation?

1. Ulothrix and Spirogyra both produce flagellated isogametes, whereas Volvox produces anisogametes.
2. Ulothrix forms non-flagellated gametes of unequal size; Spirogyra forms flagellated gametes of equal size; Volvox exhibits anisogamy.
3. Ulothrix forms flagellated gametes similar in size; Spirogyra forms non-flagellated gametes similar in size; Volvox exhibits oogamy with a non-motile female gamete.
4. Ulothrix exhibits oogamy, Spirogyra exhibits anisogamy, and Volvox exhibits non-flagellated isogamy.