IB Biology HL C4.1.17 Top Down Vs Bottom Up Control Topic Practice

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Study C4.1.17—Top-down vs. bottom-up control conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 3]

An investigation into food web interactions was conducted in mesocosms in the Mediterranean Sea, off the coast of France. The effects of the addition of soil and fish on bacterial populations were tested.

Figure for Question 1 — IB Biology HL
Figure for Question 1 — IB Biology HL

Question (a)

(a)

Assuming that the populations of bacteria are under bottom-up control, identify the mesocosms in which the bacterial populations will be highest.

[ 1 ]

Question (b)

(b)

Outline top-down effects on the bacteria in the four mesocosms.

[ 2 ]
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