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Question
The early settlers on a barren area (rock) are
The early settlers on a barren area (rock) are
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Solution
The correct option is C Lichens
Lichens stage is the first stage in Lithosere (or succession on bare rock). Bare rock is invaded first by crustose lichens e.g : Graphis, Rhizocarpon. They corrode the rock at places causing foliose lichen e. g : Parmelia, Dermatocarpon to invade and eliminate crustose lichens and creating conditions for invasion by mosses. In tropics, blue green algae are pioneers instead of lichens in lithosere.
Lichens stage is the first stage in Lithosere (or succession on bare rock). Bare rock is invaded first by crustose lichens e.g : Graphis, Rhizocarpon. They corrode the rock at places causing foliose lichen e. g : Parmelia, Dermatocarpon to invade and eliminate crustose lichens and creating conditions for invasion by mosses. In tropics, blue green algae are pioneers instead of lichens in lithosere.
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