Q1.6. The graphs below illustrate population sizes in an artificial lake before

Question

Q1.6. The graphs below illustrate population sizes in an artificial lake before and after a top predator (a minnow that eats zooplankton) was added. Which explanation below is consistent with the patterns shown in the graphs? BEFORE (no minnows) AFTER (with minnows) Zooplankton 2 Zooplankton 2 Zooplankton 1 Zooplankton 1 Algae 2 Algae 2 Algae 1 Algae 1 0 50 100 150 200 250 0 50 100 150 200 250 Population Size Population Size The predator preys preferentially on zooplankton 1, which outcompetes zooplankton 2 in the absence of predators The predator feeds equally on both zooplankton without preference. Zooplankton 1 outcompetes zooplankton 2 in the absence of predators The predator preys preferentially on zooplankton 1, which feeds preferentially on algae 1 The predator preys preferentially on zooplankton 2, which feeds preferentially on algae2 Submit

Explanation / Answer

Option a is correct because in first graph the number of zooplankton 1 is more than zooplankton 2 it means they compete with each other. In second graph after adding predators the number of zooplankton 1 decrease because predators pray preferentially on zooplankton 1.

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