Skip to content

Quiz: Wetland and Shoreline Plants

Test your understanding of wetland ecosystems, shoreline plants, rain gardens, and water management with these review questions.

1. What adaptation allows marsh plants like cattails and bulrushes to survive in waterlogged soils where oxygen is scarce?

  1. They store extra oxygen in their leaves during winter
  2. They have hollow stems with aerenchyma tissue that transports oxygen from above-water leaves down to submerged roots
  3. They do not need oxygen because they use a different type of photosynthesis
  4. They grow roots that extend above the water surface to breathe air directly
Show Answer

The correct answer is B. Many marsh plants have hollow stems containing aerenchyma, specialized tissue that creates internal air channels to transport oxygen from leaves and stems above the water down to submerged roots. This adaptation allows roots to function in the anaerobic (oxygen-poor) soils typical of marshes and wetlands, where most upland plants would quickly die.

Concept Tested: Marsh Plants

See: Chapter 5

2. How do carnivorous bog plants like pitcher plants and sundews supplement their nutrition?

  1. They absorb nutrients from rainwater through their leaves
  2. They parasitize the roots of nearby sphagnum moss
  3. They trap and digest insects to obtain nitrogen and phosphorus unavailable in nutrient-poor bog soil
  4. They form partnerships with specialized fungi that deliver nutrients
Show Answer

The correct answer is C. In the nutrient-poor, acidic conditions of bogs, carnivorous plants supplement their nutrition by trapping and digesting insects. Pitcher plants use fluid-filled, tube-shaped leaves with downward-pointing hairs that prevent insects from climbing out. Sundews use sticky droplets on their leaves to trap prey. This strategy provides the nitrogen and phosphorus these plants cannot obtain from the bog's impoverished soil.

Concept Tested: Bog Plants

See: Chapter 5

3. What is the Ojibwe name for Wild Rice, and why is the plant culturally significant?

  1. Wakan; it is used exclusively for ceremonial purposes
  2. Manoomin; it has been a sacred food and cultural anchor for Indigenous peoples for centuries
  3. Wahpe; it was the primary building material for traditional shelters
  4. Mashkiki; it was valued only as a medicinal plant
Show Answer

The correct answer is B. Wild Rice is known as manoomin in the Ojibwe language and holds deep cultural and spiritual importance for the Ojibwe, Dakota, and other Indigenous peoples of Minnesota. Harvesting wild rice has been a sacred tradition for centuries, involving two people in a canoe using knockers to tap ripe grains free. The grain remains a staple food and anchor of cultural identity. Wild Rice is also Minnesota's state grain.

Concept Tested: Wild Rice

See: Chapter 5

4. Which native wetland wildflower is primarily pollinated by hummingbirds due to its long, tubular, brilliant red flowers?

  1. Blue Flag Iris
  2. Joe-Pye Weed
  3. Cardinal Flower
  4. Swamp Milkweed
Show Answer

The correct answer is C. Cardinal Flower produces spikes of brilliant scarlet-red, tubular flowers that are perfectly adapted for hummingbird pollination. The long tube shape matches the Ruby-throated Hummingbird's long bill and hovering flight, while most insects cannot reach the nectar. Cardinal Flower blooms in late summer along streams, wet meadows, and floodplains.

Concept Tested: Cardinal Flower

See: Chapter 5

5. What are the four planting zones used in a "living shoreline" stabilization project, from water to land?

  1. Deep water, shallow water, beach, and lawn
  2. Submerged, emergent, transitional, and upland buffer
  3. Aquatic, sandy, gravel, and rock
  4. Underwater, mud flat, shrub, and forest
Show Answer

The correct answer is B. A living shoreline uses four planting zones: the submerged zone (underwater plants like Wild Celery and pondweeds), the emergent zone (plants at the water's edge like bulrushes and Blue Flag Iris), the transitional zone (moist bank plants like sedges and willows), and the upland buffer (native grasses and wildflowers on drier slopes). Using plants from multiple zones creates continuous vegetation from water to land.

Concept Tested: Shoreline Stabilization

See: Chapter 5

6. Why is hybrid cattail considered a problem in Minnesota wetlands, unlike native Broad-leaved Cattail?

  1. Hybrid cattail produces no seeds, so wildlife cannot use it for food
  2. Hybrid cattail is toxic to fish and amphibians
  3. Hybrid cattail forms dense monocultures that crowd out native marsh plants and reduce wildlife diversity
  4. Hybrid cattail cannot survive Minnesota winters and dies back, leaving bare soil
Show Answer

The correct answer is C. Hybrid cattail combines the toughness of both parent species and is highly aggressive, forming dense monocultures that crowd out native marsh plants, reduce wildlife diversity, and alter wetland hydrology. Many "cattail-choked" wetlands in Minnesota are dominated by this hybrid rather than the native Broad-leaved Cattail. In balanced numbers, native cattail provides valuable wildlife habitat, water filtration, and shoreline erosion control.

Concept Tested: Native Cattail

See: Chapter 5

7. How does a rain garden capture and treat stormwater runoff?

  1. It channels water through underground pipes to a treatment facility
  2. It uses chemical additives in the soil to neutralize pollutants
  3. It captures runoff in a planted depression where deep-rooted native plants and soil microbes filter pollutants as water infiltrates the ground
  4. It collects water in a sealed basin for later irrigation use
Show Answer

The correct answer is C. A rain garden is a shallow, planted depression that captures stormwater runoff from impervious surfaces. The garden fills with a few inches of water that soaks into the ground over 24-48 hours. During infiltration, deep native plant roots create soil channels that improve absorption, while roots and soil microbes filter out pollutants like phosphorus, nitrogen, oil, and heavy metals. Even a small rain garden (100-300 square feet) can significantly reduce pollution reaching local waterways.

Concept Tested: Rain Garden Plants

See: Chapter 5

8. You are designing a rain garden and need to place plants in the correct moisture zones. Where should Blue Flag Iris be planted?

  1. On the dry upper edges of the rain garden
  2. In the deepest, wettest center of the rain garden
  3. Only on the surrounding upland, away from any standing water
  4. Evenly across all zones since it tolerates any moisture level
Show Answer

The correct answer is B. Blue Flag Iris naturally grows in marshes, wet meadows, and along lake margins, making it an excellent choice for the deepest, wettest zone of a rain garden where temporary standing water collects. Plants like Prairie Blazing Star belong on the drier upper edges, while Joe-Pye Weed fits the middle slopes. Matching plants to moisture zones is a key principle of rain garden design.

Concept Tested: Rain Garden Plants

See: Chapter 5

9. A single acre of wetland can store approximately how much floodwater?

  1. About 1,000 gallons
  2. About 50,000 gallons
  3. About 1 to 1.5 million gallons
  4. About 10 million gallons
Show Answer

The correct answer is C. A single acre of wetland can store 1 to 1.5 million gallons of floodwater. Dense root systems and organic soils absorb water like a sponge, and wetlands slowly release stored water, reducing peak flows downstream. When wetlands are drained, this storage capacity disappears and downstream communities experience more severe flooding. Programs like Minnesota's RIM Reserve compensate landowners for permanently restoring wetlands.

Concept Tested: Flood Mitigation

See: Chapter 5

10. Why do native prairie plantings infiltrate stormwater 4 to 10 times faster than conventional turf grass lawns?

  1. Prairie plants release chemicals that make soil more absorbent
  2. Prairie plants have leaves that absorb more rainwater before it hits the ground
  3. Native prairie grass roots extend 6-15 feet deep, creating an extensive network of soil channels for water to follow
  4. Prairie soil has more sand mixed in, which naturally drains faster
Show Answer

The correct answer is C. The key difference is root depth. Typical lawn grasses have roots only 2-4 inches deep, while native prairie grasses send roots 6-15 feet into the ground. These deep roots create an extensive network of channels through the soil profile. When rain falls on a native planting, water follows these root channels deep into the ground, dramatically increasing infiltration rates compared to shallow-rooted turf grass.

Concept Tested: Stormwater Management

See: Chapter 5

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.