Ecosystem 6 - Unit Test

Based on the given diagram, which pair of animals exhibit a mutual relationship?

• Eagle and Thrush

• Butterfly and Dragonfly

• Butterfly and Lavenders

• Wolf and Python

Based on the given diagram, which animal pair is competing for exactly the same food resource, wherein both are just competitors and are not preyed upon by each other?

• Python and Eagle

• Frog and Dragonfly

• Wolf and Eagle

• Wolf and Python

Leaves of plants in the tropical rainforest floor are wide and broad. This adaptation is dictated by specifically what environmental factor?

• The plants are closer to the rivers and streams making water easily available.

• The forest floor receives a relatively less amount of sunlight as compared to the other layers.

• Wind cannot reach the forest floor due to the existence of bigger plants in the understory.

• More nutrients can be extracted from the soil because of its proximity.

Why do rainforests harbor high biodiversity?

• It receives a considerable amount of rainfall to sustain plant life.

• The existence of vegetation encourages population growth in consumers.

• It contains plant life that changes color according to the climate.

• Due to the existence of high population of plants, the soil is not considered nutrient-rich.

Among the four types of coral reefs, it is described as horseshoe-shaped that started as a reef system coral colony around a volcanic island that sunk which left the coral behind.

• Fringing Reef

• Barrier Reef

• Atoll

• Patch Reefs

Coral reefs are mostly found in tropical areas. What environmental factor is the main cause of this occurrence?

• The salinity of the ocean water affects the emergence of coral reefs in tropical areas.

• The animal population is diverse in tropical areas.

• Tropical areas receives direct sunlight.

• Tropical areas are most affected by typhoons.

The existence of a wide diversity of crabs in a mangrove forest indicates the the ecosystem is healthy and thriving. Which of the following fiddler crab activities exhibits a symbiotic relationship in the ecosystem?

• Fiddler crabs fighting for resources.

• These crabs creates tunnels in the mudflats to avoid desiccation.

• They burrow to hide from predators.

• They have one claw that is considerably larger than the other.

Estuaries are characterized by its brackish waters, and are dominated by mangroves. How was it possible for mangroves to survive in waters with different salinity from sea and fresh waters?

• They have leaves that can absorb fresh water from the rain.

• Mangroves have sturdy stems that does not easily rot with water exposure.

• They have roots that are alternative breeding areas for fishes.

• They have roots adapted to changes in salt concentrations.

This freshwater microalgae can be found in swamp ecosystems. What is the importance of the existence of phytoplanktons in freshwater ecosystems?

• They are the main producers in the ecosystem food web.

• When there is algal bloom, it covers the surface of the water helping the organisms that are submerged within.

• They prevent the water from getting polluted.

• Phytoplankton in freshwater biomes are adapted to low water concentrations.

Identify the relationship between the frog and the water lily.

• mutualism

• commensalism

• parasitism

• competition