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Which of the following substances does a plant obtain from the air?

• Nitrogen

• Magnesium

• Water

• Carbon

• All of the listed responses are correct.

Which of the following would be considered as a sustainable agricultural practice?

• flooding fields

• drip irrigation

• phytoremediation

• draining aquifers to irrigate crops

• the second and the third responses are correct

What is the goal of photoremediation?

• To replace lost minerals in soil

• To increase resistance to aluminum toxicity

• To test whether an element is essential to a certain species of plant

• To grow crops such as alfalfa and wheat that provide good ground cover

• To clean contaminated sites by using plants that have the ability to extract and store soil pollutants

The biological process that produces 96% of the dry mass of a plant is called __________.

• oxidation

• photosynthesis

• transpiration

• cation exchange

• respiration

Soil could be deficient in any of the following nutrients. If you had to supply one of them, which would be needed in the smallest amount?

• Nitrogen

• Phosphorus

• Iron

• Potassium

• Sulfur

Which of the following is a true statement regarding mineral deficiency symptoms in plants?

• Symptoms always show up in younger leaves first.

• Symptoms of mineral deficiency always show up in older leaves first.

• Deficiency symptoms of freely moving nutrients will show up first in younger organs.

• Deficiency symptoms of immobile nutrients will show up first in older organs.

• Growing tissues would show signs of mineral deficiency of mobile nutrients after older tissues.

Which of the following organisms can fix nitrogen?

• Legumes

• Rhizobia

• Mycorrhizal fungi

• Lichens

• Azolla

In root nodules, the plants provide __________, and the bacteria provide __________.

• carbohydrates; fixed nitrogen

• ATP; nitrogen gas

• carbohydrates; nitrogen gas

• an aerobic environment; fixed nitrogen

• amino acids; ATP

By trapping insects, carnivorous plants obtain __________, which they need __________.

• sugars; because they can't make enough in photosynthesis

• phosphorus; to make protein

• nitrogen; to make sugar

• water; because they live in dry soil

• nitrogen; to make protein