Phenomenon of halotism or controlled parasitism is shown by _______.
A
Leguminous roots
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B
Lichens
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C
Mycorrhiza
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D
All of the above
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Solution
The correct option is B Lichens B. Lichens
Reason: Helotism is a term used for the symbiosis in which on one of the members dominate another such as lichen. Fungus (mycobiont) sends haustoria into algal cells (phycobiont) and induces alga to secrete organic substances and prevent alga to develop pectic covering. It means fungus is a controlled parasite over the alga. Thus, the correlation in lichens are considered as helotism for such king and slavery relation.