Locomotion and Movement — Class 11 MCQs with Answers

Locomotion and Movement — important questions & MCQs with answers (Class 11 Biology)

14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 76 are timed and scored when you sign in.

1. Q1Easy

   Voluntary muscles are:

   A.Skeletal/striated✓ Correct

   B.Cardiac

   C.Smooth

   D.All

   Answer: A. Skeletal/striated

   Explanation: Skeletal muscle is striated and voluntary, moved consciously via tendons on bone. Cardiac muscle is also striated but involuntary — that overlap is the tempting wrong pick here.

2. Q2Easy

   Number of bones in adult human body:

   A.500

   B.300

   C.100

   D.206✓ Correct

   Answer: D. 206

   Explanation: Adults have 206 bones: axial 80 + appendicular 126. Children start near 270–300 because bones like skull plates and sacral segments haven't fused yet.

3. Q3Easy

   Which of the following is NOT a type of movement shown by human body cells?

   A.Photonastic✓ Correct

   B.Amoeboid

   C.Ciliary

   D.Muscular

   Answer: A. Photonastic

   Explanation: Photonastic movement is a plant response to light, not a cell movement type. Human cells instead show amoeboid (WBCs), ciliary (trachea) and muscular movement.

4. Q4Easy

   Functional unit of contraction in skeletal muscle is:

   A.Myosin head

   B.Myofibril

   C.Sarcolemma

   D.Sarcomere✓ Correct

   Answer: D. Sarcomere

   Explanation: The sarcomere, the segment between two Z lines, is skeletal muscle's functional contractile unit. A myofibril is a bundle of many sarcomeres strung end to end.

5. Q5Easy

   Total number of bones in adult human skeleton is:

   A.212

   B.180

   C.300

   D.206✓ Correct

   Answer: D. 206

   Explanation: Adult human skeleton totals 206 bones: 80 axial (skull, vertebral column, ribs, sternum) plus 126 appendicular (limbs and girdles).

6. Q6Easy

   Amoeboid movement in humans is performed by:

   A.Platelets

   B.RBCs

   C.Macrophages and leucocytes✓ Correct

   D.Sperm

   Answer: C. Macrophages and leucocytes

   Explanation: Macrophages and leucocytes move by amoeboid motion, extending pseudopodia via actin filaments — RBCs and platelets lack this cytoskeletal machinery for locomotion.

7. Q7Medium

   Sliding filament theory: contraction is due to:

   A.Nerves contracting

   B.Bones moving

   C.Actin sliding over myosin✓ Correct

   D.Cells dividing

   Answer: C. Actin sliding over myosin

   Explanation: Sliding filament theory: thin actin filaments slide over stationary thick myosin filaments via cross-bridge cycling powered by ATP — myosin doesn't shrink, it pulls actin inward.

8. Q8Medium

   Hinge joint example:

   A.Knee✓ Correct

   B.Shoulder

   C.Hip

   D.Skull sutures

   Answer: A. Knee

   Explanation: A hinge joint like the knee moves in only one plane (flex/extend), unlike the ball-and-socket hip or shoulder, which rotate freely in multiple planes.

9. Q9Medium

   Smooth muscles are found in walls of:

   A.Tongue

   B.Skeletal limbs only

   C.Heart wall

   D.Internal organs like stomach and intestine✓ Correct

   Answer: D. Internal organs like stomach and intestine

   Explanation: Smooth muscle lines internal organ walls like the stomach and intestine, contracting involuntarily for peristalsis — the tongue and limbs instead use skeletal muscle.

10. Q10Medium

    In a sarcomere, A band represents:

    A.Region of only thin filaments

    B.Region containing thick (myosin) filaments✓ Correct

    C.Region between two Z lines

    D.Region with no filaments

    Answer: B. Region containing thick (myosin) filaments

    Explanation: The A band marks where thick myosin filaments lie, overlapping actin at its edges; its length stays constant during contraction, unlike the shrinking I band.

11. Q11Medium

    Pectoral girdle in humans consists of:

    A.Ilium and ischium

    B.Clavicle and scapula✓ Correct

    C.Sternum and ribs

    D.Sacrum and coccyx

    Answer: B. Clavicle and scapula

    Explanation: The pectoral girdle is one clavicle plus one scapula per side, anchoring the arm to the axial skeleton — the pelvic girdle instead fuses ilium, ischium and pubis.

12. Q12Hard

    Ca²⁺ binds ___ to initiate muscle contraction.

    A.Actin directly

    B.Troponin✓ Correct

    C.Tropomyosin

    D.Myosin head only

    Answer: B. Troponin

    Explanation: Ca²⁺ binds troponin, not actin or tropomyosin directly — this shifts tropomyosin off actin's myosin-binding sites, exposing them for cross-bridge formation.

13. Q13Hard

    Osteoporosis is characterised by:

    A.Decreased bone mass and density✓ Correct

    B.Joint inflammation

    C.Muscle paralysis

    D.Excess cartilage

    Answer: A. Decreased bone mass and density

    Explanation: Osteoporosis is reduced bone mass and density from calcium/oestrogen loss, common post-menopause — distinct from arthritis, which is joint inflammation, not bone loss.

14. Q14Hard

    Assertion: All locomotions are movements. Reason: All movements are locomotions.

    A.Both false

    B.Both true; R explains A

    C.A true, R false✓ Correct

    D.A false, R true

    Answer: C. A true, R false

    Explanation: Locomotion is always a movement, so the assertion is true — but not all movement is locomotion (a heartbeat doesn't relocate the body), so the reason is false.

Locomotion and Movement — FAQs

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• 02Biological Classification
• 03Plant Kingdom
• 04Animal Kingdom
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• 06Anatomy of Flowering Plants

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