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Yields a antibiotic called is effective against Tubercle
bacilli.
Presence of Chara and Nitella in points causes the death of
mosquito larvae by producing some poisonous substances.
Harmful activities:- Some of the algae attach themselves to
various parts of ships and produce fouling. This results in
wastage of fuel. Cephaleuros is parasite on the leaves of
some of the angiosperms.
Camellia thea :- spoils fabrics.
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