Question

what do you understand by saprophytes and symbiotic relationship?​

Answer 1

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Answer 2

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In lichens, the green coloured plant called 'alga' (autotroph) and non-green plant 'fungus' (saprophyte) live together. The fungus holds the alga cells in its mat of web-like hyphae (thin filaments).

Thus, Rhizobium bacteria and leguminous plants have symbiotic relationship.