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Quiz: Prairie Plants and Grassland Ecosystems

Test your understanding of tallgrass prairie ecology, grasses, wildflowers, soil systems, and fire management with these review questions.

1. What nickname is Big Bluestem's seed head commonly known by, and why?

  1. "Foxtail" because it resembles a fox's bushy tail
  2. "Turkey foot" because the seed head splits into three finger-like branches
  3. "Cattail" because it grows near water like a cattail
  4. "Bottlebrush" because the seeds cluster in a cylindrical shape
Show Answer

The correct answer is B. Big Bluestem's seed head typically splits into three finger-like branches that resemble a turkey's foot, earning it the nickname "turkey foot." Big Bluestem is the signature grass of the tallgrass prairie, growing up to eight feet tall, and is so closely associated with this ecosystem that it is sometimes called the "Big Bluestem prairie."

Concept Tested: Big Bluestem

See: Chapter 3

2. What is the key difference between warm-season (C4) and cool-season (C3) prairie grasses?

  1. Warm-season grasses are always taller than cool-season grasses
  2. Cool-season grasses have deeper root systems than warm-season grasses
  3. Warm-season grasses grow most actively in summer heat, while cool-season grasses grow in the cooler temperatures of spring and fall
  4. Cool-season grasses are always native, while warm-season grasses are always non-native
Show Answer

The correct answer is C. Warm-season (C4) grasses begin growing in late spring and reach peak growth during the hottest summer months, using a more efficient photosynthetic pathway for hot conditions. Cool-season (C3) grasses green up earlier and grow most actively in the moderate temperatures of spring and fall. Both types include native species, and height varies by species, not by season category.

Concept Tested: Warm Season Grasses

See: Chapter 3

3. Why is the presence of Prairie Dropseed in a prairie considered an indicator of high quality?

  1. It produces the deepest roots of any prairie grass
  2. It is extremely slow to establish and does not colonize disturbed or recently restored sites
  3. It is the only grass that can survive fire
  4. It produces seeds that only germinate in pristine soil
Show Answer

The correct answer is B. Prairie Dropseed is extremely slow to establish from seed, often taking three or more years to reach maturity, and it typically does not colonize disturbed or recently restored sites. Its presence indicates that a prairie has been relatively undisturbed for a long time. Individual plants may persist for decades. Prairie Dropseed is also notable for its fragrant seed heads, described as smelling like buttered popcorn.

Concept Tested: Prairie Dropseed

See: Chapter 3

4. What ecological service do Prairie Clovers provide that most other prairie wildflowers do not?

  1. They are the only flowers that attract monarch butterflies
  2. They produce berries that feed songbirds through winter
  3. They fix atmospheric nitrogen into a form usable by plants through a partnership with soil bacteria
  4. They release chemicals that repel invasive species
Show Answer

The correct answer is C. Prairie Clovers are legumes that partner with specialized soil bacteria to fix atmospheric nitrogen into a form that plants can use. This nitrogen fixation enriches the soil and benefits neighboring plants, making Prairie Clovers important contributors to prairie nutrient cycling. While many other wildflowers support pollinators, the nitrogen-fixing ability is unique to legumes like Prairie Clover and Leadplant.

Concept Tested: Prairie Clover

See: Chapter 3

5. A common misconception blames a particular plant for causing hay fever. Which plant is wrongly accused, and what is the actual cause?

  1. Goldenrod is blamed, but Common Ragweed is the actual cause
  2. Purple Coneflower is blamed, but grass pollen is the actual cause
  3. Milkweed is blamed, but tree pollen is the actual cause
  4. Blazing Star is blamed, but mold spores are the actual cause
Show Answer

The correct answer is A. Goldenrod is commonly and incorrectly blamed for hay fever because its bright yellow flowers are visible during allergy season. In reality, Goldenrod pollen is heavy and sticky, carried by insects rather than wind. The true culprit is Common Ragweed, which blooms at the same time and releases vast quantities of lightweight, wind-borne pollen. Ragweed's tiny green flowers go unnoticed compared to Goldenrod's showy display.

Concept Tested: Goldenrod Species

See: Chapter 3

6. Which of the following correctly describes the role of mycorrhizal fungi in prairie soils?

  1. They decompose dead roots and release nitrogen into the air
  2. They form symbiotic partnerships with plant roots, extending their reach to access water and nutrients in exchange for sugars
  3. They compete with plant roots for soil nutrients, reducing plant growth
  4. They create a waterproof layer around roots that prevents drought damage
Show Answer

The correct answer is B. Mycorrhizal fungi form symbiotic partnerships with prairie plant roots: the fungus extends the plant's root network, accessing water and nutrients (especially phosphorus) that roots alone cannot reach, and in return the plant shares sugars produced through photosynthesis. More than 80 percent of prairie plant species depend on these partnerships. Mycorrhizal networks are a critical component of healthy prairie soil ecology.

Concept Tested: Prairie Soil Ecology

See: Chapter 3

7. Where do prairie remnants most commonly survive today?

  1. In areas with the most fertile soils
  2. On land that was easy to irrigate
  3. In places that were difficult to plow, such as rocky terrain, railroad rights-of-way, and pioneer cemeteries
  4. Along major highway corridors built in the 1950s
Show Answer

The correct answer is C. Prairie remnants survive in places that were difficult to plow: rocky or steep terrain, railroad rights-of-way that were never cultivated, pioneer cemeteries left undisturbed, roadsides with native soil intact, and state or federal preserves. These fragments are irreplaceable because they contain plant communities that took thousands of years to develop, along with unique soil biology that cannot be recreated in restored prairies.

Concept Tested: Prairie Remnants

See: Chapter 3

8. You are planning a rain garden in a low, moist area of your yard and want to include milkweed for monarch butterflies. Which milkweed species would be the best choice?

  1. Butterfly Milkweed, which prefers dry sandy soils
  2. Whorled Milkweed, which thrives on dry prairies
  3. Common Milkweed, which spreads aggressively by rhizomes
  4. Swamp Milkweed, which grows naturally in wet prairies and along shorelines
Show Answer

The correct answer is D. Swamp Milkweed is the best choice for a rain garden or other moist site because it naturally grows in wet prairies and along shorelines. Butterfly Milkweed and Whorled Milkweed prefer dry conditions and would struggle in a rain garden. Common Milkweed could survive in moist soil but spreads aggressively by rhizomes and might overtake a small rain garden. Matching milkweed species to your site's moisture level is key to success.

Concept Tested: Milkweed Species

See: Chapter 3

9. What are the three historical forces that shaped Minnesota's tallgrass prairies before European settlement?

  1. Logging, mining, and agriculture
  2. Fire, grazing by bison, and climate
  3. Flooding, volcanic activity, and erosion
  4. Indigenous farming, beaver dams, and tornadoes
Show Answer

The correct answer is B. For thousands of years, tallgrass prairies were shaped by three forces: fire (from lightning and burns set by Indigenous peoples), grazing by vast bison herds, and climate (hot summers, cold winters, drought, and strong winds). These forces favored deep-rooted grasses over trees. Indigenous peoples, including the Dakota, used fire strategically to manage the landscape for millennia before European settlement.

Concept Tested: Tallgrass Prairie History

See: Chapter 3

10. Why is fire considered essential for maintaining a healthy tallgrass prairie?

  1. It sterilizes the soil to eliminate plant diseases
  2. It permanently eliminates all non-native grasses from the site
  3. It removes accumulated thatch, recycles nutrients, warms soil, and kills invading tree seedlings
  4. It triggers seed germination in all prairie wildflower species simultaneously
Show Answer

The correct answer is C. Fire maintains prairie health by removing dead plant litter (thatch) that smothers new growth, recycling nutrients through ash, warming the soil earlier in spring, and killing tree and shrub seedlings that would otherwise shade out prairie plants. Prairie plants survive fire because their growing points are protected underground. Without periodic fire, prairies gradually convert to shrubland and eventually forest.

Concept Tested: Fire Ecology

See: Chapter 3

Ready to use these ideas rather than recall them? Try the Applied Quiz for this chapter — ten scenario questions that put you in a situation and ask what to do.