Multiple Choice
Which of the following human activities is a primary cause of eutrophication in aquatic ecosystems?
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48. Ecology
Introduction to Ecology
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In a typical grassland food web, which of the following organisms would most likely be classified as secondary consumers?
A
Hawks that prey on snakes
B
Frogs that eat insects
C
Rabbits that feed on grass
D
Grass that performs photosynthesis
Verified step by step guidance1
Step 1: Understand the concept of trophic levels in a food web. Primary producers (like grass) perform photosynthesis and are at the base of the food web. Primary consumers (like rabbits) feed directly on primary producers. Secondary consumers feed on primary consumers or other organisms lower in the food chain.
Step 2: Analyze the role of each organism in the food web. Grass is a primary producer because it performs photosynthesis. Rabbits are primary consumers because they feed on grass. Frogs that eat insects are secondary consumers because insects are primary consumers.
Step 3: Recognize that hawks that prey on snakes are tertiary consumers. Snakes are secondary consumers because they often eat primary consumers like rodents or insects. Hawks, being higher up in the food chain, are tertiary consumers.
Step 4: Focus on the organism classified as secondary consumers. Frogs that eat insects fit this category because they consume primary consumers (insects).
Step 5: Conclude that frogs that eat insects are the correct answer, as they occupy the secondary consumer trophic level in the grassland food web.
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