OBJECTIVE LIFE SCIENCE
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Each individual is pretty strong
|
|
|
Some individuals vary, and may have a natural resistance to the pesticide
|
|
|
There is enough food for them
|
|
|
None of the above
|
Detailed explanation-1: -Genetics and intensive application of insecticides are responsible for the rapid development of resistance in many insects and mites. Selection by an insecticide allows some insects with resistance genes to survive and pass the resistance trait on to their offspring.
Detailed explanation-2: -When a pesticide is first used, a small proportion of the pest population may survive exposure to the material due to their distinct genetic makeup. These individuals pass along the genes for resistance to the next generation.
Detailed explanation-3: -Pests becomes resistant by evolving physiological changes that protect them from the chemical. One protection mechanism is to increase the number of copies of a gene, allowing the organism to produce more of a protective enzyme that breaks the pesticide into less toxic chemicals.
Detailed explanation-4: -The twospotted spider mite is a pest of most fruit crops and is notorious for rapidly developing resistance to miticides.