The base of a biomass pyramid is the smallest for ecosystems ____
a. in the desert
b. in forest habitats
c. in tundra habitats
d. in the sea
e. in prairie habitats
ANSWER: d
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Because of the environmental impact of inorganic fertilizers, scientists are working to engineer plants that more efficiently acquire phosphate. Which options below are likely to achieve that goal? (check all that apply)
_____ Plants that express more phosphatase. _____ Plants that make mycorrhizal associations with fungi. _____ Plants that grow less complex root systems. _____ Smart plants that can sense phosphate levels. _____ Plants that secrete less organic acid.
Which tissue is striated and can rapidly contract, producing voluntary movements?
a. skeletal muscle b. smooth muscle c. bone tissue d. cardiac muscle e. adipose tissue
As blood is pumped through the chambers of the heart it directly supplies the heart with oxygen and nutrients.
Indicate whether the statement is true or false.
In the Gulf of Mexico dead zone, oxygen levels in lower water levels are low because ____.
a. phytoplankton consume vast quantities of oxygen without producing any oxygen b. the runoff into the dead zone is contaminated with high densities of bacteria that consume oxygen c. of the Great Lakes d. pollutants in runoff, especially fertilizers, lead to phytoplankton growth and the dead phytoplankton are consumed by bacteria that use up oxygen e. the runoff into the dead zone is already extremely low in oxygen and mixes with the water already present in the Gulf of Mexico