World Biomes

Marshes are found at the mouths of ______.

• Deserts

• Rivers

• Mountains

• Oceans

Answer explanation

Marshes are wetlands that typically form at the mouths of rivers where freshwater meets saltwater. This environment supports diverse ecosystems, making 'Rivers' the correct answer.

Which adaptation helps marsh plants to survive in low oxygen environments?

• Thick leaves

• Adventitious roots

• Shallow roots

• Elongated stems

Answer explanation

Elongated stems allow marsh plants to access more oxygen from the air above the water, helping them survive in low oxygen environments. This adaptation is crucial for their growth and respiration.

Fill in the blank: _______ are special roots that sprout off underwater stems in marsh plants.

• Tap roots

• Adventitious roots

• Fibrous roots

• Prop roots

Answer explanation

Adventitious roots are specialized roots that develop from non-root tissues, such as underwater stems in marsh plants, allowing them to anchor and absorb nutrients effectively in their aquatic environment.

Swamps and bogs are often located near what geographical feature?

• Deserts

• Streams

• Mountains

• Oceans

Answer explanation

Swamps and bogs are wetlands that often form near streams, as they require a consistent water source. Streams provide the necessary moisture and nutrients, making them ideal locations for these ecosystems.

What are the characteristics of river headwaters?

• Warm and low oxygen

• Cold and highly oxygenated

• Warm and highly oxygenated

• Cold and low oxygen

Answer explanation

River headwaters are typically cold due to their elevation and proximity to snowmelt. They are also highly oxygenated because of the turbulent flow and contact with the atmosphere, making 'Cold and highly oxygenated' the correct choice.

The adaptations of river organisms will vary based on where in the river they are. True or False?

• True

• False

Answer explanation

True. River organisms adapt to different environments within the river, such as varying flow rates, depths, and light availability, leading to diverse adaptations based on their specific habitat.

What type of animal is shown in the second image?

• Bird

• Fish

• Mammal

• Reptile

Answer explanation

The second image depicts a fish, which is characterized by its gills, fins, and aquatic habitat. This distinguishes it from birds, mammals, and reptiles, making 'Fish' the correct answer.

Dams are built to ____.

• increase water flow

• alter the flow of the water

• reduce water levels

• clean the water

Answer explanation

Dams are primarily constructed to alter the flow of water, managing its distribution for purposes like irrigation, flood control, and hydroelectric power generation. The correct choice reflects this fundamental purpose.

What is an estuary?

• A place where fresh and salt water meet

• A desert

• A mountain range

• A forest

Answer explanation

An estuary is defined as a place where fresh water from rivers meets and mixes with salt water from the ocean. This unique environment supports diverse ecosystems, making the first answer choice correct.

In an estuary, fresh water from rivers meets ______.

• A) salt water

• B) fresh water

• C) rain water

• D) lake water

Answer explanation

In an estuary, fresh water from rivers meets salt water from the ocean. This mixing creates a unique environment where both types of water coexist, making option A the correct answer.