Unsustainable farming practices include
A) abandoning fields and allowing them to go through natural succession.
B) using herbicides and pesticides.
C) abandoning the use of irrigation to water fields.
D) mulching fields after harvest.
E) planting different crops in the same field in alternating years.
B
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Respiration is controlled by
(a) chemoreceptors. (b) stretch receptors. (c) centers in the brain stem. (d) all of the above.
Lithoautotrophs use inorganic nutrients for carbon and energy sources.
Answer the following statement true (T) or false (F)
What provides the greatest visual acuity (the precise
discrimination between adjacent points in space) in the human eye? a. photoreceptors in the sclera b. photoreceptors in the fovea c. protein filaments in the lens d. photoreceptors in the optic nerve e. none of these
Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?
a. There was more enzyme present in the more concentrated solutions. b. A greater amount of heat was generated in the more concentrated solutions. c. The more concentrated solutions lowered the activation energy of the reaction. d. The higher substrate concentrations in the more concentrated solutions speeded the reaction. e. The density of the water was lower in the more concentrated solutions.