WorksheetsTN_Botany_ NEET_
Total questions: 23
Worksheet time: 11mins
Organisms use nitrogen to form
carbohydrates and lipids
proteins and lipids
lipids and nucleic acids
proteins and nucleic acids
Which of the following is true about phosphorus?
Phosphorus is an important component of RNA and DNA.
Phosphorus can be “fixed” by lightning.
Phosphorus is released into the air when animals exhale carbon dioxide.
Phosphorus is found primarily in the atmosphere.
Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert
proteins into nitrates
nitrates intro nitrogen gas
ammonia into proteins
nitrogen gas into ammonia
What is nitrogen fixation?
Nitrogen incorporated into plant tissues
Plants get nitrogen from nitrates
When nitrogen gas is converted into ammonia
nitrogen is harvested from the atmosphere by higher plants
Because of biogeochemical cycling,
human activity has no effect on elements, chemical compounds, and other forms of matter.
living organisms are not limited by any one nutrient.
nutrients are circulated throughout the biosphere.
many nutrients do not reach toxic concentrations in the biosphere.
In the phosphorous cycle what happens after the rain removes phosphate from sedimentary rocks and washes into the hydrosphere?
All phosphate molecules wash back into the ocean, and settle to the floor
Cellular respiration produces CO2, which is released into the air or water
The Earth's geological plates shift and the rock is pushing upwards
Rain dissolves limestone into its component molecules
When nitrogen gas is turned in to a form that plants and animals can use is called
Nitrogen Fixation
Combustion
Photosynthesis
Decomposition
Why must nitrogen fixation occur?
Bacteria cannot eat anything else except for nitrogen gas
Ammonia is necessary for animals to drink
If nitrogen gas is not fixed, then it is not usable for plants
Plants can directly use nitrogen gas (N2)
Which cycle is shown
carbon
water
nitrogen
phosphorus
Growing legumes such as alfalfa, peas or soy beans increases the process of
denitrification
nitrogen fixation
ammonification
ammonium oxidation
How are nitrogen-based fertilizers made?
Photosynthesis
It's already made
Denitrification
Combining nitrogen gas with hydrogen
Which of the following is a limiting nutrient in an aquatic ecosystem?
Nitrogen
Carbon
Water
Oxygen
Which process takes Carbon dioxide from the air and converts it into a form of carbon used by living things?
Precipitation
Photosynthesis
Respiration
Bioremediation
The nitrogen cycle is a biogeochemical cycle because it moves ?
only between living things (biosphere)
only in the soil (geosphere)
between the 4 different spheres
only in the air (atmosphere)
What role do bacteria play in the nitrogen cycle?
Convert inorganic nitrogen into organic nitrates
Break down dead organisms
Move nitrogen from the atmosphere into the soil
Turn nitrates into nitrogen gas.
If the atmosphere is 78% N2, why can't we just get our nitrogen by breathing?
We have no mechanism to break the triple bond of nitrogen between the atoms.
Our lungs would be damaged by the N2.
We need oxygen for cellular respiration.
The legumes take it up first.
What happens when organisms die and decay?
Their nitrogen moves to the air as nitrogen gas
Their nitrogen becomes tapped in clay and is unusable
They stay on earth forever
Their nitrogen returns to the soil as ammonium
How do animals get nitrogen
from drinking water
lightning storms
breathing it in
eating other organisms
Which of these correctly shows the reservoirs where most of Earth's carbon atoms and nitrogen atoms are residing at any given time?
Nitrogen makes up ________ percent of the air that we breathe.
87%
38%
78%
21%
