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Question 1:

What are aquatic ecosystems?

A) Ecosystems found in the atmosphere
B) Ecosystems found on land
C) Ecosystems found in the ocean and freshwater bodies
D) Ecosystems found underground

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Explanation: The correct answer is C) Ecosystems found in the ocean and freshwater bodies. Aquatic ecosystems refer to the ecosystems found in both marine (ocean) and freshwater environments, including lakes, rivers, streams, wetlands, and coral reefs. These ecosystems are characterized by distinct aquatic organisms and are crucial for supporting biodiversity, providing habitat for various species, and performing vital ecosystem functions.

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Question 2:

Which of the following is an example of a freshwater ecosystem?

A) Coral reef ecosystem
B) Mangrove ecosystem
C) Lake ecosystem
D) Savanna ecosystem

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Explanation: The correct answer is C) Lake ecosystem. Lakes are an example of freshwater ecosystems. They are large bodies of water surrounded by land and are characterized by a variety of aquatic life, including fish, plants, and microorganisms. Other examples of freshwater ecosystems include rivers, streams, and wetlands.

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Question 3:

What is the largest aquatic ecosystem on Earth?

A) Coral reef ecosystem
B) Lake ecosystem
C) Ocean ecosystem
D) Mangrove ecosystem

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Explanation: The correct answer is C) Ocean ecosystem. The ocean is the largest aquatic ecosystem on Earth, covering approximately 71% of the planet's surface. It encompasses a wide range of habitats, including the open ocean, coral reefs, and deep-sea ecosystems. The ocean plays a vital role in regulating the climate, providing habitat for numerous marine species, and supplying resources that support human societies.

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Question 4:

What is the primary factor influencing the distribution of marine ecosystems?

A) Temperature
B) Precipitation
C) Salinity
D) Sunlight

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Explanation: The correct answer is C) Salinity. Salinity, the concentration of dissolved salts in water, is the primary factor influencing the distribution of marine ecosystems. Different marine organisms have varying tolerance to salinity levels, and the availability of specific species and communities is closely tied to the salinity conditions of the water. For example, coral reefs are typically found in areas with lower salinity, while salt marshes thrive in areas with higher salinity.

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Question 5:

What is an example of a threatened aquatic ecosystem?

A) Mangrove ecosystem
B) Tundra ecosystem
C) Grassland ecosystem
D) Alpine ecosystem

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Explanation: The correct answer is A) Mangrove ecosystem. Mangroves are an example of a threatened aquatic ecosystem. Mangrove forests are found in coastal areas and provide important habitats for a wide range of species. However, they are under threat due to factors such as coastal development, pollution, and climate change. The loss of mangrove ecosystems has significant ecological and socioeconomic impacts, including the loss of important nursery grounds for fish and increased vulnerability to coastal erosion and storm damage.