Question

Placenta in Dryopteris is

• A. The place of attachment of ramenta
• B. The place of attachment of sporangia
• C. The place from where rhizoids arise
• D. The place of attachment of archegonia

Answer 1

The correct option is B The place of attachment of sporangia

In the life cycle of Dryopteris, the asexual sporophyte is the dominant individual. This is perennial and evergreen and differentiates into rhizome (stem), roots and leaves ( fronds). When the fronds mature these become fertile and are called as sporophylls since they contain sori. In each sorus stalked sporangia is present arising from the placenta, the swollen outgrowth on the divisions of the pinna or leaflets.

So, the correct answer is option B.