A catalyst speeds up a chemical reaction as a result of which of the following?
A) It provides an alternate pathway with a lower activation energy.
B) It increases the number of collisions between reacting molecules.
C) It makes the reaction more endothermic.
D) It makes the reaction more exothermic.
A
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Which of the following best describes the role of biological activity in soil development?
A) Plant roots provide channels for air and water movement in soils. B) Broadleaf trees tend to increase the alkalinity of soil, whereas needleleaf trees increase the acidity. C) Earthworms increase soil porosity and contribute to soil movement and organic content. D) All organisms living in, on, and over the soil, influence soil development and characteristics: they can influence the pH, the organic matter, chemical content, and biological content of soils.
Which of the following is not an element of the climate of an area?
A) hourly wind speed and direction B) insolation C) temperature D) air pressure E) atmospheric moisture
Soils in tropical rainforests are
A. thin and nutrient poor. B. thin and nutrient rich. C. thin. D. nutrient rich. E. nutrient poor.
A generalist is a species that
A. Occupies a large habitat range B. Occupies a wide range of ecological niches C. Can reproduce only under specific conditions D. Can reproduce under highly variable conditions E. None of these are characteristics of a generalist species