Final answer:
The statement is True; in sexual reproduction of ferns, the immature archegonium contains the egg cells, and the antheridium produces sperm for fertilization.
Step-by-step explanation:
In sexual reproduction of ferns, the gametophytes contain specialized structures for reproduction, which include the archegonia and antheridia. The archegonium, a flask-shaped female structure, is where you will find the egg or ovum. Therefore, the statement that the immature archegonium contains the egg cells is True. Antheridia, the male reproductive organs, produce sperm with flagella that enable them to swim to the archegonia for fertilization. After the sperm reaches the egg in the archegonium and fertilization occurs, a zygote is formed, which will eventually grow into a new sporophyte fern.