Question

In Dryopteris, the opening mechanism of sporangium is effectively operated by

• A. Stalk
• B. Rhizoids
• C. Stomium
• D. Peristome

Answer 1

The correct option is C Stomium

Sporangium

Sporangium is a structure inside which spores are formed. Diploid spore mother cells present inside sporangium undergo meiosis to form haploid spores.

Stomium

Sporangium has a layer of jacket cells. Some of these jacket cells have deposition on their walls and are known as annulus. The remaining cells form the stomium. Stomium is the point of dehiscence of sporangia due to differential contraction of the annulus.