Identifying Trophic Levels in Food Webs

Steps:

• Recall definitions: Producers make food (e.g., plants); herbivores eat producers; carnivores eat other animals; consumers include herbivores and carnivores.
• Examine the diagram: Count organisms by role—1 producer (base level), 3 herbivores (plant-eaters), 4 carnivores (meat-eaters), totaling 7 consumers.
• Match counts to choices: Verify which option aligns with these tallies.
• Confirm: Total organisms should sum logically (1 producer + 7 consumers = 8 total).

Why A is correct:

• It matches exact counts: 1 producer (autotrophs), 3 herbivores (primary consumers), 4 carnivores (secondary/tertiary consumers), and 7 total consumers (all heterotrophs).

Why the others are wrong:

• B: Wrong carnivore (2 instead of 4) and producer (4 instead of 1) counts.
• C: Wrong consumer (4 instead of 7) and herbivore (8 instead of 3) counts.
• D: Wrong carnivore (7 instead of 4) and herbivore (2 instead of 3) counts.

Final answer: A