Question

A fern prothallus has antheridia and archegonia. The fusion of male and female gametes from the same prothallus is cross fertilization or self fetilization

Answer 1

The prothallus is haploid, since it grew from a spore which had been formed by meiosis. It does not have any vascular tissue and uses small rhizoids to anchor it to the ground. On the underside of the prothallus the sex organs form. The female structure, called an archegonium, contains a single egg.