Question

Prothallus is not found in O Lycopodium O Dryopteris O Cycas O Adiantum​

Answer 1

The correct solution is option c. Cycas.

• Prothallus is a free-living photosynthetic gametophyte of pteridophytes. Examples: Adiantum, Lycopodium, Pteris etc.
• Cycas is a Gymnosperm. It is a seed-producing plant but seeds are not enclosed in an ovary and the prothallus stage is not found in them.
• Prothallus is small and multicellular and thalloid i.e is undifferentiated into the stem, leaves and roots.
• Haploid spore usually germinates to form a heart-shaped prothallus which is green in colour.
• It is monoecious i.e both archegonia( female sex organ) and antheridia( male sex organ are present on the same thalloid.
• Numerous rhizoids are also found underneath the prothallus.

Answer 2

Answer:

Prothallus is not found in – O Cycas.

Explanation:

Cycas is a Gymnosperm.

Hope it helps,,,