One of the advantages of Bacillusthuringiensls (B.t.) toxins over chemical insecticides results from their specificity for pest insects. The toxins have no known detrimental effects on mammals or birds. In addition, the limited range of activity of the toxins toward insects means that often a particular toxin will kill pest species but not affect insets that prey upon the species. This advantage makes B.t. toxins preferable to chemical insecticides for use as components of insect pest management programs.
Which one of the following statements, if true, most weakens the argument?
(A) Chemical insecticides cause harm to a greater number of insectspecies than do B.t. toxins. - WRONG. Supports the passage rather.
(B) No particular B.t. toxin is effective against allinsects . - WRONG. Passage particularly points out about specific species so this choice unnecessarily brings all insects into consideration.
(C) B.t. toxins do not harmweeds that do damage to farm crops. - WRONG. Weed
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Which one of the following statements, if true, most weakens the argument?
(A) Chemical insecticides cause harm to a greater number of insectspecies than do B.t. toxins. - WRONG. Supports the passage rather.
(B) No particular B.t. toxin is effective against allinsects . - WRONG. Passage particularly points out about specific species so this choice unnecessarily brings all insects into consideration.
(C) B.t. toxins do not harmweeds that do damage to farm crops. - WRONG. Weed
...
Statistics : Posted by unraveled • on 04 May 2020, 01:26 • Replies 6 • Views 3447
