QS Study

Gametophyte of moss: Gametophyte of moss plant is haploid (n). Its body is divided into two stages.

I) Protonema

II) Gametophore

Protonema: Spores produced from moss capsule germinate in the favorable condition. Spores germinate to form a filamentous, branched and algae like plant, called protonema.

Gametophore: The part of the protonema developed erectly and enriched with leaves is known as gametophore protonema dies after the gametophore becomes fully developed.

At the matured stage, protonema has three parts

(a) Stem: It is slender flexible and branched or unbranched.

(b) Leaf: Leaves are simple and spirally arranged in the stem. Each leaf has a single midrib.

(c) Rhizoid: The hairy filaments growing in a cluster from the underground part of stem are known as rhizoids.

Rhizoids instead of roots, fix the plant firmly with the soil and absorb water and mineral.