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Question

Which one controls dehiscence of sporangium in Dryopteris?

A
Annulus
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B
Tapetum
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C
Sorus
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D
Indusium
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Solution

The correct option is A Annulus
In Dryopteris, the annulus and the stomium help in the dehiscence of the sporangium and dispersal of spores. At maturity, the sporangium dehisces by drying action, which exerts pressure on mouth assisted by shrinkage of the annulus. Lastly mouth of sporangium open and spores are liberated.

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