Matter and Energy in the Environment # 5

Flashcard
•
Science
•
8th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the nitrogen cycle?
Back
The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms, including nitrogen gas, ammonia, nitrites, and nitrates, through biological and physical processes.
2.
FLASHCARD QUESTION
Front
How do bacteria contribute to the nitrogen cycle?
Back
Bacteria convert nitrogen gas into ammonia through a process called nitrogen fixation, making nitrogen available for plants.
3.
FLASHCARD QUESTION
Front
What are the three processes that add inorganic phosphate (PO4^3-) to the soil?
Back
Precipitation, runoff, and weathering of rock contribute to the addition of inorganic phosphate to the soil.
4.
FLASHCARD QUESTION
Front
How does phosphorus enter the soil?
Back
Phosphorus enters the soil through the weathering of rocks, decomposition of organic matter, and application of fertilizers.
5.
FLASHCARD QUESTION
Front
What is primary productivity?
Back
Primary productivity is the rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem.
6.
FLASHCARD QUESTION
Front
What effect does increasing nitrogen and phosphorus availability have on primary productivity?
Back
Increasing the availability of nitrogen and phosphorus typically leads to an increase in primary productivity.
7.
FLASHCARD QUESTION
Front
What percentage of the atmosphere is made up of nitrogen?
Back
Approximately 78% of the atmosphere is composed of nitrogen.
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