Practice B3.3 Muscle and motility (HL) with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
HLPaper 1A
| Sarcomere Region | Resting Length (μm) | Contracted Length (μm) |
|---|---|---|
| A-band | 1.8 | 1.8 |
| I-band | 0.7 | 0.4 |
| H-zone | 0.4 | 0.1 |
Based on the data, which conclusion best supports the sliding filament mechanism?
Question 2
HLPaper 1A
Refer carefully to the specific arrangement and position of the biceps and triceps in the image.
Which change would be observed in the diagram if the forearm were raised instead of extended?
Question 3
SLPaper 1A
Muscle fibres appear larger than most other cells. Which of the following explains this?
Question 4
HLPaper 1A
What is the role of calcium ions released from the sarcoplasmic reticulum?
Question 5
HLPaper 1A
What is the role of the joint capsule in an elbow joint?
Question 6
HLPaper 1A
What is a similarity between human and insect muscles?
Question 7
HLPaper 2
1.[7]
Explain how the sliding filament model accounts for muscle contraction and relaxation including the roles of ATP and calcium ions.
Question 8
HLPaper 1A
Which processes require calcium?
I. Muscle contraction
II. Movement of an action potential along an axon
III. Production of the skeleton of hard corals
Question 9
HLPaper 1A
The electron micrograph shows sarcomeres in myofibrils of striated muscle during muscle contraction. The lines P-Q and R-S show two regions of one sarcomere.
How would regions P-Q and R-S change when the muscle relaxes?
| P-Q | R-S |
|---|---|
| wider | narrower |
| narrower | wider |
| wider | no change |
| no change | wider |
Question 10
HLPaper 1A
Which structure is used for locomotion in the earthworms but not in arthropods, bony fishes or birds?