Unit 1 Progress Check: MCQ
A temperate grassland biome has a gross primary productivity of 3,480kilocalories/meter2/year and a net primary productivity of 2,000kilocalories/meter2/year. Which of the following is the approximate number of kilocalories/meter2/year available to herbivores in that biome?
200kilocalories/meter2/year
Based on the food web shown above, which of the following correctly describes the flow of energy through the trophic levels from producers to quaternary consumers?
Brittlebrush, grasshopper, grasshopper mouse, rattlesnake, red-tailed hawk
Which of the following types of organisms are required to complete the nitrogen cycle, including the process of denitrification?
Correct. Certain bacteria are specialized in fixing nitrogen, in association with plants such as soybeans and other legumes. Other types of bacteria perform nitrification: converting ammonium ions into nitrite ions, and then into nitrate ions. Finally, other bacteria perform denitrification, the reduction of nitrates back into nitrogen gas.
The total rate of photosynthesis in a given area.
Gross primary productivity
Energy is transferred along food chains from one stage to the next. Which statement best explains how the energy is transferred?
If a primary producer stores 10,000kcal of energy, then a tertiary consumer will have 10kcal of energy available.
Which trophic level has the least available energy in kilojoules in this food web?
Killer whale
Which of the following best describes the flow of energy in most terrestrial and near-surface marine ecosystems?
Producers use energy from the sun to make organic matter, such as sugars, from carbon dioxide and water and are then consumed by organisms higher in the food chain.
Based on the second law of thermodynamics, how much biomass of phytoplankton would be needed to produce 1 kilogram (kg) of large fish in this food web?
Since energy transfer is not 100% efficient and assuming the 10% rule, 10kg of phytoplankton would not be enough to produce 1kg of large fish. 1,000kg
The majority of the nitrogen on Earth can be found in which of the following reservoirs?
The atmosphere
Which of the following describes the most likely change to terrestrial biomes resulting from warmer average global temperatures?
The global distribution of midlatitude biomes, such as grasslands and temperate rain forests, would increase.
Which of the following statements is best supported by the diagram of the phosphorus cycle?
The phosphates absorbed by animal tissue through consumption eventually return to the soil.
Which of the following terrestrial biomes has the highest net primary productivity?
Tropical rain forest
source of carbon
fossil fuels
