The death rate of organisms in a population exhibiting a Type III survivorship curve is:
a. usually correlated with density-independent causes.
b. more or less constant throughout their lives.
c. lower after the organisms survive to the critical age of establishment.
Ans: c. lower after the organisms survive to the critical age of establishment.
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Many plants have fungi in a close symbiotic relationship with the plant roots. These are
a. root nodules. b. mycorrhizae. c. parenchyma. d. sclerenchyma. e. stomata.
. Four of the five answers listed below are
relationships in which at least one of the interactants benefits. Select the EXCEPTION.
a. competition b. parasitism c. mutualism d. commensalism e. predation
If an individual with the dominant phenotype is crossed with an individual with the recessive phenotype and all the offspring have the dominant phenotype, it would be concluded that the individual with the dominant phenotype is _____.
a. homozygous dominant b. heterozygous c. homozygous recessive
Which of the following microbes produces a protein that kills a variety of insect pests?
A. Pseudomonas B. Haemophilus influenzae C. Bacillus thuringiensis D. Thermus aquaticus E. Plasmodium falciparum