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Practice Reading: Multiple Choice, Single Answer ID: #34930 Plankton
Instructions ›
Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.
The surface water of the ocean is rich in tiny forms of plant and animal life. This vast floating population of microscopic organisms is called the “plankton.” Just as man and all land animals depend ultimately for their food supply upon the grass and other green-leaved plants which, under the influence of sunlight, are able to transform the inorganic constituents of the atmosphere and the soil into organic foodstuffs—protein, fat, carbohydrates— so the tiny unicellular marine plants of plankton are able to transform the inorganic components of their environment into fat, protein, and carbohydrates under the influence of sunlight. All marine life, therefore, depends directly or indirectly on these tiny organisms.

What does the writer say about plankton?

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Result:

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Option 2: "Aquatic creatures depend on it for their survival."

Explanation: This option is correct as the text indicates that all marine life depends directly or indirectly on plankton. This aligns with the idea that aquatic creatures rely on plankton for their food supply, as plankton transforms inorganic materials into organic foodstuffs.

Option 1: "The surface water of the earth is covered with it."

Explanation: This option is incorrect because the text does not state that the surface water is covered with plankton. Instead, it mentions that plankton is a floating population in the ocean's surface water, which implies presence but not coverage.

Option 3: "Plankton produces inorganic substances in the environment."

Explanation: This option is incorrect because the text states that plankton transforms inorganic components into organic substances (fat, protein, carbohydrates), not that it produces inorganic substances. This misrepresents the role of plankton.

Option 4: "Man and all land animals depend ultimately for their food supply upon it."

Explanation: This option is incorrect because while the text discusses how land animals depend on plants for food, it does not state that they depend on plankton. The focus is on marine life's dependence on plankton, not land animals.

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