What is crustose lichens stage?

Write some examples of crustose lichens stage.

These questions consist of two statements each printed as Assertoin and Reason. While answering these questions, you are requied to choose any one of the following four responses. If both Assertion and Reason are true and Reason is correct explanation of Assertion If both Assertion and REason are true but Reason is not correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Assertion: In crustose lichen stage, by corroding action, soil formation occurs but his action is very slow Reason: Crustose lichens produce carbonic acid which corrodes the rock

Among the crustose, foliose and fructose lichens, which one is a pioneer species?

What are lichens ?

What are viroids and lichens?

What are the different stages of matter based upon physical states ?

The enzyme recombinase is required at which stage of meiosis?

What are lichens and mycorrhiza?