Quiz 4 prep

This question is regarding the Nitrogen Cycle. ________________ is when bacteria or fungi convert N gas or N compounds into ammonium ions.

• Nitrogen Fixation

• Nitrification

• Ammonification

• Denitrification

This question is regarding the Nitrogen Cycle. ________________ is when bacteria convert N gas into organic compounds organisms can take up.

• Nitrogen Fixation

• Nitrification

• Ammonification

• Denitrification

This question is regarding the Nitrogen Cycle. During ______________, soil bacteria convert ammonium ions to nitrite ions. Then, nitrite ions are converted to nitrate ions.

• Nitrogen Fixation

• Nitrification

• Ammonification

• Denitrification

This question is regarding the Nitrogen Cycle. During _______________, bacteria convert nitrate ions into N gas.

• Nitrogen Fixation

• Nitrification

• Ammonification

• Denitrification

Assimilation refers to the process by which an organism absorbs nutrients from food. (Eg - when a plant takes up a nutrient).

• true

• false

What is the main reason for using legume cover crops (eg- hairy vetch and clover) in agriculture?

• To increase soil nitrogen content with less synthetic fertilizer

• To decrease the pH level of the soil

• To increase the oxygen content in the atmosphere

• To reduce water usage in agriculture

Before planting legumes, some producers inoculate legumes before planting. This adds rhizobia and promotes nitrogen fixation.

• true

• false

________________ are compounds made up of a phosphorus atom combined with oxygen atoms

• Sulfates

• Phosphates

• Phosphites

• none of the answers are correct

Nitrogen-fixing Bacteria help to convert nitrogen gas into usable nitrogen. These bacteria can be found in __________

• hairy vetch

• legumes

• clover

• all of the answers are correct

_______________ is in short supply and can limit the growth of organisms.

• Phosphorus

• A limiting nutrient

• Both answers are correct

• none of the answers are correct