Practise 18 real Federal Board questions on Support and Movement from 2023 to 2026. See the answer and explanation as soon as you answer.
Support and Movement is one of the 15 main chapters in our Federal Board FSC Biology question bank (12th class), and about 4% of its real questions come from it. Tayyari Karo has 18 real questions on this chapter from 2023 to 2026; 8 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 14 medium, 2 hard, 2 easy.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
During muscle contraction, which part of Sarcomere remains constant in length?
Answer: B. A band
The A band (length of the thick myosin filament) stays constant during contraction, while the I band and H zone shorten as filaments slide.
Which one of the following does not correspond to the thin myofilament?
Answer: C. Myosin
Myosin forms the thick filament of the sarcomere; actin, tropomyosin and troponin are all components of the thin filament.
Put the following statement in proper order to describe muscle contraction: 1. Signal sent by CNS via motorneuron 2. Sarcomere Shortens 3. Generation of action potential in the sarcolemma 4. Release of Ca⁺² from sarcoplasmic reticulum
Answer: D. 1→3→4→2
Correct sequence: (1) CNS sends signal via motor neuron → (3) action potential generated in sarcolemma → (4) Ca²⁺ released from sarcoplasmic reticulum → (2) sarcomere shortens.
When ligaments are stretched or torn, it can lead to a condition called:
Answer: A. Sprain
A sprain is the stretching or tearing of a ligament at a joint.
The bone dissolving cells are:
Answer: D. Osteoclasts
Osteoclasts resorb (break down/dissolve) bone matrix, releasing calcium and remodeling bone; osteoblasts build new bone.
The immobility and fusion of vertebral joints is called:
Answer: A. Spondylosis
Spondylosis refers to degenerative stiffening/fusion of the vertebral joints of the spine.
(a) Describe the role of calcium ions in muscle contraction. (b) What happens to sarcomere during contraction?
(a) When a nerve impulse triggers release of Ca²⁺ from the sarcoplasmic reticulum, Ca²⁺ binds to troponin on the thin filament, causing tropomyosin to shift and expose the myosin-binding sites on actin — allowing cross-bridges to form and the sliding filament mechanism (contraction) to proceed. Without Ca²⁺, the binding sites stay blocked and contraction cannot occur.
(b) During contraction, the thin (actin) filaments slide past the thick (myosin) filaments toward the centre of the sarcomere: the I band and H zone narrow/shorten, and the overall sarcomere length decreases, while the A band length remains unchanged (constant, as it corresponds to the length of the myosin filament).
Briefly describe three types of joints with one example of each.
(1) Fibrous (immovable/synarthrosis) joint — bones held together by fibrous connective tissue with little/no movement, e.g. sutures of the skull.
(2) Cartilaginous (slightly movable/amphiarthrosis) joint — bones connected by cartilage allowing limited movement, e.g. joints between vertebrae (intervertebral discs).
(3) Synovial (freely movable/diarthrosis) joint — bones separated by a fluid-filled synovial cavity, allowing free movement, e.g. the knee or elbow (hinge joint).
| Session | Questions |
|---|---|
| 2026 Annual | 5 |
| 2025 1st Annual | 3 |
| 2025 2nd Annual | 5 |
| 2024 Annual | 3 |
| 2023 Annual | 2 |
18 real Federal Board (FBISE) Biology questions on Support and Movement from 2023 to 2026, for 12th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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