L 3.4 Cycles of Matter Flashcards
How does matter move through the biosphere?
Unlike the one-way flow of energy, matter is recycled within and between
ecosystems.
biogeochemical cycles
Elements pass from one organism to another and among parts of the biosphere through closed loops
How does water cycle through the biosphere?
Water continuously moves between the oceans, the atmosphere, and land—sometimes outside living organisms and sometimes inside them.
What is the importance of the main nutrient cycles?
Every organism needs nutrients to build tissues and carry out life functions.
Nutrient
chemical substances that an organism needs to sustain life
water can also enter the atmosphere by evaporating from leaves of plants in the process of …..
Transpiration
Oxygen gas in the atmosphere is released by one of the most important of all biological activities:
photosynthesis
Oxygen is used in respiration by…..
all multicellular forms of life, and many single-celled organisms as well.
Carbon is a major component of all organic compounds, including carbohydrates, lipids, proteins, and nucleic acids. (true or false)
true
all organisms require nitrogen to make ???
amino acids which combine to form proteins, and nucleic acid, which combine to form DNA and RNA.
Bacteria convert nitrogen gas into ammonia, a process known as
Nitrogen fixation
some other .types of bacteria obtain energy by converting nitrates into nitrogen gas
which is released into the atmosphere in a process called
denitrification
A relatively small amount of nitrogen gas is converted to usable forms by lightning in a process called
Atmospheric nitrogen fixation
The nutrient whose supply limits productivity is called
the limiting nutrient
How does nutrient availability really to the primary productivity of an ecosystem
If Ample sunlight and water are available the primary productivity of ecosystem may be limited by the availability of nutrients
