The benefits of many pesticides are often short-lived, and their amounts must be increased for continued effectiveness because:
A) they react with their own breakdown products.
B) they select for evolution of resistance in target organisms.
C) they interact with other pesticides already in use.
D) they interact with various fertilizers applied to the same fields.
Ans: B) they select for evolution of resistance in target organisms.
You might also like to view...
If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?
A) Backtrack through her previous experiments to obtain another plant with the same traits. B) Breed this plant with another plant with much weaker traits. C) Clone the plant. D) Force the plant to self-pollinate to obtain an identical one. E) Add nitrogen to the soil of the offspring of this plant so the desired traits continue.
In a parasitic relationship where the host contracts a disease and sometimes dies, the parasite is called:a
a predator. b. a keystone species. c. a mutualistic symbiont. d. an interspecific competitor. e. a pathogen.
The amino acid sequences of human and chimpanzee hemoglobin are almost identical, yet they differ considerably from the sequence of the hemoglobin of dogs. This fact
A) neither supports nor opposes the theory of evolution. B) opposes the theory of evolution. C) supports the theory of evolution.
Choose the one environmental problem that you feel is in need of our most immediate attention. Describe the problem and explain why you feel it is the one that is most urgent.
What will be an ideal response?