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An estuary is a body of water in which fresh water draining from the land mixes with salt water from the ocean. The result of this mixture is an environment with abundant plant and animal life. The Indian River Lagoon is a 156-mile-long estuary on Florida"s eastern coast. It is a diverse estuary, supporting thousands of species of plants and animals.The food web & food pyramid shown above are examples of the relationships that exist in the Indian River Lagoon ecosystem.Bạn vẫn xem: bài thi tiếng anh trên mạng ioe lớp 7 cấp cho thành phố

Câu 1Which of the following has the largest population in the Indian River Lagoon ecosystem?

A. Crab

B. Egret

C. Flounder

D. Phytoplankton

Câu 2

In the Indian River Lagoon ecosystem, many organisms compete with one another for food sources.Which organism in the food website competes with egrets for food?

A. Clam worm

B. Crab

C. Flounder

D. Heron

Câu 3

Which of the following statements most accurately describes the energy transfer between the levels of the food pyramid in the Indian River Lagoon?

A. Energy travels up the pyramid.

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B. Energy stays in the phytoplankton at the lowest level.

C. Energy is released into the environment only at the đứng top level.

Câu 4

Which gas is a waste hàng hóa given off by the respiratory system of a human?

A. Oxygen (O2)

B. Nitrogen (N2)

C. Sulfur dioxide (SO2)

D. Carbon dioxide (CO2)

Câu 5


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An oscilloscope is an instrument that can be used to lớn display the properties of waves. Melanie studies four pictures of waves from an oscilloscope.Which picture shows waves with the shortest wavelength?

A. I

B. II

C. III

D. IV

Câu 6

Iron chloride is formed when 44 g of iron and 56 g of chlorine react completely.What is the expected mass of iron chloride?

A. 12 g

B. 44 g

C. 56 g

D. 100 g

Câu 7

Which change will occur if global temperatures increase và the polar ice caps melt?

A. Coastal cities will be flooded.

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B. Land for farming will increase.

C. Crop production will increase.

D. Climates will become cooler.

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Câu 8


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The table above shows the distance a cart travels over time.