Multiple Choice
How do vestigial structures provide evidence for evolution?
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1. Introduction to Biology
Natural Selection and Evolution
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In a typical pond ecosystem, is a frog considered a secondary consumer?
A
Yes, because frogs primarily eat insects, which are primary consumers.
B
Yes, because frogs are producers in the food web.
C
No, frogs are tertiary consumers because they eat fish.
D
No, frogs are primary consumers because they eat plants.
Verified step by step guidance1
Understand the concept of trophic levels in an ecosystem: Producers (autotrophs) create their own food through photosynthesis, primary consumers (herbivores) eat producers, secondary consumers (carnivores or omnivores) eat primary consumers, and tertiary consumers eat secondary consumers.
Analyze the diet of frogs: Frogs primarily eat insects, which are herbivores (primary consumers) that feed on plants. This places frogs in the category of secondary consumers because they consume primary consumers.
Eliminate incorrect options: Frogs are not producers because they do not create their own food through photosynthesis. Frogs are also not tertiary consumers in this context because they primarily eat insects, not other carnivores or secondary consumers. Lastly, frogs are not primary consumers because they do not eat plants.
Confirm the correct answer: Based on the food web and trophic level definitions, frogs are secondary consumers because they feed on primary consumers (insects).
Conclude that the correct answer is: 'Yes, because frogs primarily eat insects, which are primary consumers.'
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