IB Biology SL C Interaction & Interdependence Question Bank

Practise IB Biology SL C Interaction and Interdependence through questions on signalling, transport, defence, ecosystems and organism interactions.

Covered syllabus points

C1.1 Enzymes and metabolism C1.2 Cell respiration C1.3 Photosynthesis C2.2 Neural signalling C3.1 Integration of body systems C3.2 Defence against disease C4.1 Populations and communities C4.2 Transfers of energy and matter

[Maximum number: 1]

How do cells capture the energy released by cell respiration?

They store it in molecules of carbon dioxide.

They produce glucose.

The energy is released as pyruvate.

They produce ATP.

[Maximum number: 5]

Describe how leaf cells make use of light energy.

[Maximum number: 7]

The diagram below shows a motor neuron.

Figure for Question C Interaction and Interdependence question 3 — IB Biology SL

(a)

Label the structures indicated by the numbers I-IV.

[ 2 ]

(b)

State a function of motor neurons.

[ 1 ]

(c)

Define resting potential.

[ 1 ]

(d)

Outline how nerve impulses are transmitted along a nerve fibre.

[ 3 ]

a. (sodium channels/voltage-gated channels open and) $\mathrm{Na}^{+}$ diffuse into neuron (down concentration gradient);
b. inside of neuron becomes positive compared to outside / potential is reversed / depolarization;
c. wave of depolarization moves (down the membrane);
d. (potassium channels open and) $\mathrm{K}^{+}$ diffuse out (down concentration gradient);
e. inside becomes negative compared with outside / potential across membrane restored / repolarization;
f. active transport of $\mathrm{K}^{+}$ (into neuron) and $\mathrm{Na}^{+}$ (out of neuron) restores resting potential;

[Maximum number: 3]

The diagram shows a biofilm that has formed on a tooth.

Figure for Question C Interaction and Interdependence question 4 — IB Biology SL

Using the diagram, explain the concept of emergent properties of biofilms.

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Covered syllabus points

C Interaction and Interdependence question 1

C Interaction and Interdependence question 2

C Interaction and Interdependence question 3

Question (a)

Question (b)

Question (c)

Question (d)

C Interaction and Interdependence question 4