10 Jun BIOLOGY 171 – Which of the following statements is
Question
1. Which of the following statements is NOT TRUE of nitrogen-fixing bacteria?
a. They are very common in symbioses in all plant families.
b. They provide an important way for biologically available nitrogen to enter ecosystems.
c. They are very common in symbioses with plants from the legume family.
d. They live in root nodules.
e. Some are free-living in the soil.
2. Decomposers such as bacteria and fungi are critical to ecosystem processes because __________________________.
a. they capture carbon dioxide from the environment and, therefore, are the base of all terrestrial and oceanic food chains.
b. they allow organic molecules to be stored in detrital pools.
c. their activities determine how quickly nutrients are recycled.
d. they are not directly impacted by temperature and precipitation regimes and thus can photosynthesize in all seasons.
3. What can decomposers do? Choose all of the accurate statements.
a. Make organic carbon available in the soil, which plants can take up
b. Convert organic molecules containing nitrogen into bioavailable forms of nitrogen in the soil, which plants can take up
c. Convert organic nitrogen to nitrogen gas, which plants can take up
d. Convert organic molecules containing phosphorus into bioavailable forms of phosphorus in the soil, which plants can take up
e. Convert organic phosphorus to phosphoric gas in the air, which plants can take up
f. Convert nitrogen gas into nitrate, which plants can take up
g. Convert organic carbon into carbon dioxide gas, which plants can take up
4. Which of the following accurately matches the element (C, N, or P) with a form of the element that plants can take up and assimilate? Choose all that apply.
a. N: nitrate in soil
b. P: phosphate in soil
c. C: carbonate in soil
d. P: phosphoric gas (PO2) in the air
e. N: nitrogen gas (N2) in the air
f. C: carbon dioxide gas (CO2) in the air
5. Which of the following accurately matches the element (C, N, or P) with a form of the element that plants can take up and assimilate? Choose all that apply.
a. N: nitrate in soil
b. P: phosphate in soil
c. C: carbonate in soil
d. P: phosphoric gas (PO2) in the air
e. N: nitrogen gas (N2) in the air
f. C: carbon dioxide gas (CO2) in the air
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