29. Which of the following is (are) true? a. Predators normally require more tha

Question

29. Which of the following is (are) true?

a. Predators normally require more than one host to reach maturity.

b. True parasites feed on one or more hosts and normally kill their hosts.

c. Parasitoids normally require only one host to complete development.

d. None of the above

e. Two of the above

30. The number of insect herbivore species found in an area is positively correlated to

a. the structural diversity of the plant community.

b. the number of plant species in the community.

c. the number of insect predators/parasitoids in the community.

d. Only a and b.

e. All of the above.

31. Which of the following diseases are transmitted by Diptera?

a. Malaria, Elephantiasis, and Dengue.

b. Malaria, Chagas’, and West Nile Virus.

c. Chagas’, Plague, and Malaria

d. Plague, Encephalitis, and Malaria

e. Encephalitis, West Nile Virus, and Plague.

32. Introduced insects have a tendency to become pests because

a. they are often brought into a region accidently on the crop plants to which they are specialized.

b. the natural assemblage of predators is not introduced with the pest.

c. agricultural methods used in the new region were developed prior to the introduction of a pest and these methods may enhance the pest’s ability to survive and reproduce.

d. Two of the above.

e. All of the above.

Explanation / Answer

Parasites feed on more than one host but do not kill their hosts.

Hence the given statement that parasites feed on one or more hosts and normally kill their hosts is false.

Option b is the answer

The number of insect herbivore species found in an area is positively correlated to the number of plant species in the community.

Option b is the answer

Dipteran vectors cause varied number of diseases. Some if them include malaria, elephentiasis, dengue, west nile virus etc.

Option a is the correct answer

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