A) placenta
B) ramentum
C) sporophyll
D) indusium
Correct Answer: D
Solution :
Indusium is a protective kidney shaped covering of sorus present in Dryopteris. Sporophylls are sori-bearing leaves of ferns. Placenta are cushion like structure where sporangia are developed. Ramentum are scaly leaves, which covers younger part of the leaves and rhizome.
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