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Question
Assertion :Lichens and mosses are said to form the pioneer community in xerarch succession
Reason: It is because these species get established later, during the course of succession.
Assertion :Lichens and mosses are said to form the pioneer community in xerarch succession
Reason: It is because these species get established later, during the course of succession.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
The plants that invade the base land initially, are called pioneer community. Lichens and mosses from the pioneer community in xerarch succession species. Lichens form a crust over the base rocks and begins to form soil from their organic remains and by stimulating chemical breakdown of the rocks. Lichens are normally followed by mosses, which speed up the process of soil accumulation by trapping wind blown particles. Mosses grow in bunch, and together with lichens, make a mat over the substratum. In this way, lichens and mosses get established on the barren rock as pioneer species forming the pioneer community. Generally, the pioneer species show high rate of growth but short life span. In time, the pioneer community is replaced by another community with different species combination. This second community is replaced by the third community, and so on. The plant species which get established later, during the course of succession, are know as late successional species. These species are slow growing and long lived. The terminal stage of succession is represented by the climax community which is stable and does not show change in species composition, as long as the environmental condition remain the same.So, the correct answer C 'Assertion is correct but Reason is incorrect'
The plants that invade the base land initially, are called pioneer community. Lichens and mosses from the pioneer community in xerarch succession species. Lichens form a crust over the base rocks and begins to form soil from their organic remains and by stimulating chemical breakdown of the rocks. Lichens are normally followed by mosses, which speed up the process of soil accumulation by trapping wind blown particles. Mosses grow in bunch, and together with lichens, make a mat over the substratum. In this way, lichens and mosses get established on the barren rock as pioneer species forming the pioneer community. Generally, the pioneer species show high rate of growth but short life span. In time, the pioneer community is replaced by another community with different species combination. This second community is replaced by the third community, and so on. The plant species which get established later, during the course of succession, are know as late successional species. These species are slow growing and long lived. The terminal stage of succession is represented by the climax community which is stable and does not show change in species composition, as long as the environmental condition remain the same.
So, the correct answer C 'Assertion is correct but Reason is incorrect'
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