Roaches are a common indoor pest in the south. Why must people routinely change

Question

Roaches are a common indoor pest in the south. Why must people routinely change the brand of insecticide they use?

A) The active ingredients in the insecticide break down over time.

B) Antibiotic-resistance genes in roach DNA are transferred to uninfected roaches by contact with infected ones.

C) The director action of insecticides on roach DNA cause individual roaches to slowly become immune.

D) Some individual roaches in the population may have a mutation providing some natural immunity to the first insecticide and their offspring will begin to predominate.

E) Changes in the chemical formulation of insecticides constantly improve their effectiveness.

2) Both Darwin and Wallace were greatly influenced by Thomas Malthus who observed that

A) populations increase geometrically (exponentially),

B) populations increase at the same rate as the food supply.

C) populations remain at their carrying capacity.

D) food supply usually increases faster than the population that depends on it.

Explanation / Answer

1) People routinely change the brand of insecticide they use against roaches because : Some individual roaches in the population may have a mutation providing some natural immunity to the first insecticide and their offspring will begin to predominate.

According to Darwin's theory of evolution due to natural selection:

As it was best explained by Darwinian evolution, according to which over the time mutations occurs in an organism which are natural mutations i.e mutations which are not caused by pesticides. And these natural mutations, which are best suited to environment will be selected. And those who do not adapt according to changing environment, will be eradicated.

2) Both Darwin and Wallace were greatly influenced byThomas Malthus observations which says: if population increases exponentially without any checks, it's continous and rapid increase will exceeds its ability to produce food supplies for it's support. And once the population growth is outpaced, it is forced to back to the subsistence-level otherwise it will be self-controlled through catastrophic events like war, famine, and disease

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