NEET2004BotanyReproduction in OrganismsActual
In oogamy, fertilization involves:
Options
- Aa small non-motile female gamete and a large motile male gamete
- Ba large non-motile female gamete and a small motile male gamete
- Ca large non-motile female gamete and a small non motile male gamete
- Da large motile female gamete and a small non-motile male gamete.
Correct answer
B. a large non-motile female gamete and a small motile male gamete
Step-by-step solution
In most single-celled flagellates, the female and the male or the + and the gametes, respectively have the same size. This state is called isogamy. Primitive multicellular organisms in contrast display a tendency towards gametes of different size. The female gamete is larger than the male gamete, a state called heterogamy or anisogamy. In oogamy, the female gamete, also called egg or oogonium has no flagellum. Its nucleus is surrounded by a voluminous plasma containing a lot of nutriments. The male gamete is small,