IB Biology SL C Interaction and Interdependence Questions

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

Exam points

Explain enzyme specificity, energy transformations and metabolic reactions using biological evidence and data.
Explain cellular respiration and photosynthesis, including energy transfer, limiting factors and interpretation of experimental data.
Explain neural signalling, body-system integration and defence against disease through mechanisms and feedback.
Analyse populations, communities, energy flow and matter cycling using field data, models and statistical evidence.

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.

(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.

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

All question bank results loaded

a	leaf cells contain chloroplasts;
b	light is absorbed by chlorophyll (in chloroplasts);
c	other pigments absorb different wavelengths;
d	light energy is used in photosynthesis;
e	(light is needed) to combine water and carbon dioxide/fix carbon dioxide;
f	carbon compounds/organic compounds/glucose/starch/carbohydrate are produced;
g	blue and red light is absorbed;
h	perform photolysis OR split water molecules;

I	nucleus/cell body/soma
II	myelin sheath/Schwann cell
III	axon
IV	dendrites

Covered syllabus points

Question 1

Question 2

Question 3

Question (a)

Question (b)

Question (c)

Question (d)

Question 4