Free Support and Movement MCQs with Answers
738 Support and Movement MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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121. If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:
- A. 9
- B. 5
- C. 6
- D. 7
Explanation: In a cross-section of the sarcomere, each thick filament lies at the centre of a hexagonal arrangement and is surrounded by six thin actin…
Correct answer: 6- A. 7 nm.
- B. 8 nm
- C. 16nm
- D. 10-100 ?m.
Explanation: A thick myosin filament has a diameter of about 15 to 16 nm, so 16 nm is the appropriate value.
Correct answer: 16nm- A. H- zone
- B. M- Line
- C. Z- Line
- D. A band
Explanation: A sarcomere extends from one Z-line to the next Z-line, and these boundaries move closer during contraction.
Correct answer: Z- Line- A. Sarcolemma
- B. Sarcoplasm
- C. Sarcoplasmic reticulum
- D. Cytosol
Explanation: The sarcoplasmic reticulum is a specialised smooth endoplasmic reticulum that stores calcium ions and releases them to start muscle…
Correct answer: Sarcoplasmic reticulum- A. A band
- B. 1 band
- C. H zone
- D. Sarcomere
Explanation: The H zone is the central part of the sarcomere containing thick myosin filaments without overlapping thin actin filaments, so only myosin…
Correct answer: H zone- A. 206
- B. 300
- C. 650
- D. 703
Explanation: The human body has about 600 to 650 skeletal muscles, so 650 is the accepted approximate figure.
Correct answer: 650- A. Skeletal Muscles
- B. Smooth Muscles
- C. Cardiac Muscles
- D. All of these
Explanation: Skeletal muscles are the most numerous and make up most of the muscle mass involved in voluntary movement and posture.
Correct answer: Skeletal Muscles- A. Strength
- B. Flexibility
- C. Normal physical endurance
- D. Agility
Explanation: Cardiorespiratory capacity measures how effectively the heart, lungs and blood supply oxygen during sustained activity, so it is most…
Correct answer: Normal physical endurance- A. Bony fish
- B. Cartilaginous fish.
- C. Fish like mammals.
- D. All fishes.Primary & Secondary Schooling (K-12)
Explanation: S-band or lateral undulatory locomotion is characteristically associated with cartilaginous fish, whose flexible bodies and fins produce…
Correct answer: Cartilaginous fish.- A. Plantigrade
- B. Digitigrade
- C. Unguligrade
- D. Hopping
Explanation: Unguligrade animals walk on the tips of their digits, often enclosed in hooves, which lengthens the effective limb and permits the…
Correct answer: Unguligrade- A. Cockroach
- B. Snail
- C. Earthworm
- D. Star fish
Explanation: An earthworm moves by alternating circular and longitudinal muscle contractions while its setae anchor parts of the body to the soil.
Correct answer: Earthworm- A. Ulna
- B. Radius
- C. Olecronon process of ulna.
- D. Scapula
Explanation: The biceps brachii inserts mainly on the radial tuberosity and therefore attaches to the radius.
Correct answer: Radius- A. Bracheoradialis
- B. Brachialis.
- C. Intercostals
- D. Triceps
Explanation: The triceps brachii opposes the biceps brachii: biceps flexes the elbow whereas triceps extends it.
Correct answer: Triceps- A. They are multinucleated.
- B. They are 10 - 100 ?m in diameter & surrounded by sarcolemma
- C. They contain O2 storing molecules called hemoglobin.
- D. Their cytoplasm contains high concentration of carbohydrates
Explanation: Skeletal muscle fibres contain myoglobin, an oxygen-storing pigment, rather than haemoglobin, which is the oxygen-carrying protein in red…
Correct answer: They contain O2 storing molecules called hemoglobin.- A. They appear darker than smooth muscles by naked eye.
- B. Alternating dark and light bands appear on their surface when visualized by naked eye.
- C. Alternating dark and light bands appear on their surface when visualized via a microscope.
- D. All of these
Explanation: Skeletal muscle is called striated because microscopic examination shows repeating alternating dark A bands and light I bands.
Correct answer: Alternating dark and light bands appear on their surface when visualized via a microscope.- A. A smooth muscle
- B. A cardiac muscle
- C. A skeletal muscle.
- D. All of these
Explanation: Smooth muscle contraction is regulated involuntarily by autonomic signals, local factors, and hormones, rather than by conscious motor…
Correct answer: A smooth muscle- A. Sciatica
- B. Spondylosis
- C. Slipped disc
- D. Disc tumour
Explanation: The MRI report indicates 'degeneration of intervertebral discs in the lumbar region and protrusion of the spongy nucleus pulposus.' These…
Correct answer: Spondylosis- A. Disc slip
- B. Sciatica
- C. Arthritis
- D. Spondylosis
Explanation: Spondylosis, also known as spinal osteoarthritis, is a degenerative disorder that affects the spine, particularly the intervertebral discs…
Correct answer: Spondylosis- A. Skull, vertebrae, ribs and sternum
- B. Sternum, humerus, femur and phalanges.
- C. Skull, pectoral girdle, pelvic girdle and ribs
- D. Vertebrae, clavicle, shoulder blade and humerus
Explanation: The axial skeleton consists of the skull, vertebrae, ribs, and sternum.
Correct answer: Skull, vertebrae, ribs and sternum- A. Lateral side of tibia
- B. Distal end of femur
- C. Anterior side of tibia
- D. Proximal end of tibia
Explanation: The fibula is a bone located in the lower leg, running parallel to the tibia.
Correct answer: Proximal end of tibia