Question

When the spore of a fern plant falls on moist ground, it germinates to form a green filament. It soon grows into a flat, green, heart-shaped Structure, known as

• A. Adventitious thallus
• B. Gametophyte thallus
• C. Sporophyte
• D. Prothallus

Answer 1

The correct option is D Prothallus

The fully grown sporophyte, what is commonly referred to as the fern, produces genetically unique spores in the sporangia by meiosis. The haploid spores fall from the sporophyte and germinate by mitosis, given the right conditions, into the gametophyte stage, the prothallus. The prothallus develops independently ; it grows sex organs that produce archaegonia and antheridia.

So, the correct option is D. (prothallus)