A) algae
B) ferns
C) moss
D) Cycas
Correct Answer: B
Solution :
Indusium is a membranous structure, which covers a group of sporangia below it. It is differentiated, into a kidney-shaped dorsal plate called hood and a short stalk through, which it remains attached with the undersurface of the pinnule at a swollen base called placenta. The sporangia attached with a placenta form group called sorus (pi. son). Different types of sorus (simple, gradate, mixed) are seen to be present in a box like structure called sporocarp formed on the vegetative leaf, i.e., frond of ferns. Such spore producing structure, sorus, covered by a membranous structure is not found in any group of plants (algae, bryophyta, gymnosperms) except, ferns of pteridophyta.
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