Q1 ) Red scale insects are pests which feed on lemon trees in California.
Ladybirds eat red scale insects. The graph below shows the effect of spraying lemon trees with DDT.
Explain why the number of red scale insects on lemon trees that had been sprayed with DDT increased and why the number on untreated trees stayed nearly constant.
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THAT IS BECAUSE RED SCALE INSECTS USUALLY FEED ON THE PESTS THAT DIE TO DDT. THEY ARE ALSO IMMUNE TO OTHER PESTICIDES
THE UNTREATED TREES STAYED CONSTANT AS THEY DID NOT HAVE DEAD BODIES OF PEST WHICH ACTS AS A FEED FOR RED SCALE INSECTS
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