The term "plankton" ____.
A. refers to a taxonomic division of algae
B. is a common term for microscopic organisms that drift or swim weakly in water
C. includes only multicellular forms
D. refers to small aquatic plants
E. would apply to large brown algae
Answer: B
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Normal blood pressure for an 8-year-old boy is 100/67 mm Hg. The systolic blood pressure is
(a) 33 mm Hg. (b) 100 mm Hg. (c) 67 mm Hg. (d) 167 mm Hg.
In an isometric contraction of a skeletal muscle,
(a) the tension in the muscle increases. (b) movement occurs. (c) no movement occurs. (d) both a and c occur.
Nutrient recycling in an ecosystem begins with the
a. producers. b. lower level consumers. c. upper level consumers. d. decomposers. e. detritivores.
The failure of a seedling to turn green if grown in the dark is an example of:
a) incomplete dominance. b) interaction between codominant alleles. c) a lack of the chroloplast gene. d) pleiotropy. e) interaction between genotype and environment.