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Chapter 22: Q22-7TYU (page 483)

Mosquitoes resistant to the pesticide DDT first appeared in India in 1959, but now are found throughout the world.

(a) Graph the data in the table below.

(b) Examine the graph, then hypothesize why the percentage of mosquitoes resistant to DDT rose rapidly.

(c) Suggest an explanation for the global spread of DDT resistance.

Month

0

8

12

Mosquitoes resistant to DDT

4%

45%

77%

Short Answer

Expert verified

1. The graph is plotted according to the given data as follows:

2. The graph above shows a rapid increase in the DDT-resistant populations. The major reason was the natural selection of the resistant population, which survived and reproduced further, leaving behind the non-resistant species.

3. The DDT-resistant species of mosquitoes arrived in India and spread through the world due to natural selection. The frequency of the resistant population rose due to its widespread migration and transportation around the globe.

Step by step solution

01

Pesticides and insecticides

The agents that can potentially control insects and pests from growing and destroying inanimate things are insecticides and pesticides. These agents can work through chemical and biological methods. Pesticides can prevent the growth of bacteria, including insects.

02

Explanation for part (a)

On the graph, the percentage of resistant mosquitoes occurs on Y-axis while months appear on the X-axis.

03

Explanation for part (b)

The graph shows that the DDT-resistant population of mosquitoes has increased over time. The frequent incorporation of DDT induced a series of natural selections favoring the DDT-resistant population. Another reason for such a spike in the resistant population is the higher survival and reproduction of the resistant population.

04

Explanation for part (c)

The DDT-resistant strains first appeared in India and spread across the world via migration and transportation with the assistance of wind or other transporting vehicles.

The resistant population inhabited different locations and were naturally selected in those environments. This phenomenon made the resistant species widely spread and successful.

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