Which of the following structural features of plants would not be expected to reduce transpiration?
A) thick cuticle on leaves and stems
B) abundant epidermal hairs on leaves and stems
C) sunken stomata
D) stomata on upper and lower surfaces of the leaves
E) reduced leaf size
Answer: D
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A population reaches a stable-age distribution when the
A) population stops growing. B) birthrate is less than the death rate. C) net reproductive rate (R0 ) is zero. D) proportion of individuals in each age group remains the same.
Involuntary muscle includes ________
A) skeletal muscle only B) smooth muscle only C) smooth muscle and cardiac muscle D) smooth muscle, cardiac muscle, and some skeletal muscle
In which growth phase is there intense activity preparing for population growth, but no increase in population?
A. stationary phase B. log phase C. death phase D. lag phase
How many mass extinctions mark the boundaries for geologic time periods?
A. One B. Three C. Five D. Eight E. Twelve