Which of the following represents a biological consequence of irrigation of agricultural fields?
A) lowered water tables when wells are used
B) introduction of fertilizers and pesticides into the water table
C) transmission of diseases by aquatic organisms
D) accumulation of salt in irrigated soils in arid zones
E) environmental effects of engineered structures (dikes, wells, etc.)
Ans: C) transmission of diseases by aquatic organisms
You might also like to view...
Discuss how the initiation of DNA synthesis occurs in bacteria using the terms origin of replication, replication fork, and theta structures
What will be an ideal response?
In general, in a sample of n individuals, the frequency of an allele is
A. the number of occurrences of the allele. B. the number of occurrences of the allele divided by n. C. the number of occurrences of the allele divided by twice the number of individuals in the sample (2n). D. twice the number of occurrences of the allele divided by n.
Deuterostomes evolved during the:a
Cambrian. b. Proterozoic. c. Paleozoic. d. Cenozoic. e. Devonian
Transfer of DNA between bacterial cells by viruses is called (transformation/transduction/conjugation)
What will be an ideal response?