NEET Biology Locomotion and Movement MCQs Set 16

Answer: (c) Scapula

Explanation:
1. The scapula is a large flat triangular bone in the dorsal thorax between the second and seventh ribs.
2. Femur, hip bone and sacrum are different in shape and position.

Teacher's Note:
1. Scapula: shoulder blade.
2. Has a spine and acromion.

Answer: (b) Synovial joints

Explanation:
1. Synovial joints have a fluid-filled synovial cavity between the articulating surfaces.
2. This allows free movement.

Teacher's Note:
1. Hinge joints are one type.
2. Synovial joints: most movable.

Answer: (c) Bones and cartilages

Explanation:
1. The skeletal system consists of bones and cartilages.
2. Blood, lymph and nerves are not skeletal tissues.

Teacher's Note:
1. Bones are hard.
2. Cartilage is flexible.

Answer: (a) Synovial joints

Explanation:
1. Synovial joints allow considerable movement and play the main role in locomotion.
2. Fibrous joints are immovable and cartilaginous joints have little movement.

Teacher's Note:
1. Hip, knee and shoulder are synovial.
2. Sutures are fibrous.

Answer: (c) (a) iv, (b) i, (c) ii, (d) iii

Explanation:
1. Ribs are 24 (iv), vertebrae 26 (i), phalanges 14 per limb (ii) and the sternum is 1 (iii).
2. So the matching is iv, i, ii, iii.

Teacher's Note:
1. Ribs 24.
2. Vertebrae 26.

Answer: (c) Ball & socket joints

Explanation:
1. The humerus and pectoral girdle (scapula) form a ball and socket joint.
2. It allows movement in all directions.

Teacher's Note:
1. Ball and socket: shoulder and hip.
2. Maximum mobility.

Answer: (c) A single U-shaped bone present at the base of the buccal cavity is quadrate

Explanation:
1. The U-shaped bone at the base of the buccal cavity is the hyoid, not the quadrate, so statement 3 is incorrect.
2. The brain box has 8 bones and the frontal bone is single.

Teacher's Note:
1. Hyoid is free.
2. It is not a skull bone.

Answer: (a) Ilium, ischium and pubis

Explanation:
1. Each pelvic half consists of the ilium, ischium and pubis.
2. The coracoid belongs to the pectoral girdle.

Teacher's Note:
1. Pelvic girdle supports the legs.
2. Coracoid is in the scapula.

Answer: (a) Ulna

Explanation:
1. The trochlear (semilunar) notch is on the ulna and articulates with the humerus.
2. It is part of the elbow joint.

Teacher's Note:
1. Ulna: trochlear notch.
2. Olecranon is the elbow tip.

Answer: (d) 29

Explanation:
1. The total of 29 bones in the skull includes 8 cranial, 14 facial, 6 ear ossicles and 1 hyoid.
2. So the skull and associated bones total 29.

Teacher's Note:
1. 8 + 14 + 6 + 1 = 29.
2. Without associated bones: 22.

Answer: (d) Ribs, vertebral column and sternum

Explanation:
1. The thoracic cage is formed by the ribs, vertebral column (thoracic part) and sternum.
2. The diaphragm is a muscle and not part of the skeleton.

Teacher's Note:
1. Rib cage protects the lungs and heart.
2. Diaphragm is muscular.

Answer: (b) Craniostylic

Explanation:
1. Mammals have a craniostylic jaw suspension, in which the lower jaw articulates directly with the skull.
2. Amphistylic, autodiastylic and hyostylic types occur in fishes and others.

Teacher's Note:
1. Craniostylic: mammals.
2. Autostylic: amphibians.

Answer: (b) Between the atlas and the odontoid process of axis

Explanation:
1. A pivot joint occurs between the atlas and the odontoid process of the axis.
2. The hip and shoulder are ball and socket joints.

Teacher's Note:
1. Pivot: head rotation.
2. Hinge: elbow.

Answer: (d) Ball and socket joint

Explanation:
1. The shoulder and hip are ball and socket joints, which allow the widest range of movement.
2. Pivot and hinge joints move in fewer planes.

Teacher's Note:
1. Ball and socket: 360 degrees.
2. Most mobile joints.

Answer: (b) Osteoporosis

Explanation:
1. In osteoporosis the bone loses mass and becomes fragile.
2. Gout and arthritis are joint inflammations.

Teacher's Note:
1. Common in elderly women.
2. Low estrogen is a cause.

Answer: (c) C

Explanation:
1. The two halves of the pelvic girdle meet ventrally at the pubic symphysis, so A is true.
2. The symphysis is made of fibrocartilage and allows slight movement, so R is false.

Teacher's Note:
1. Cartilaginous joint.
2. Not fibrous.

Answer: (a) A

Explanation:
1. The first seven pairs of ribs are the true ribs.
2. They are attached dorsally to the thoracic vertebrae and ventrally to the sternum by hyaline cartilage, so R explains A.

Teacher's Note:
1. True ribs: vertebrosternal.
2. Hyaline cartilage joins them.

Answer: (a) A

Explanation:
1. A ball and socket synovial joint gives the maximum mobility.
2. A ball can rotate in a spherical socket about any axis, which explains this.

Teacher's Note:
1. Shoulder and hip joints.
2. Rotation in all planes.

Answer: (b) B

Explanation:
1. Arthritis is inflammation of the synovial joints, so A is true.
2. Synovial joints are mobile, so R is true but it does not explain A.

Teacher's Note:
1. Arthritis: joint inflammation.
2. Gout is one type.

Answer: (b) B

Explanation:
1. The axis allows rotation of the neck because its odontoid process forms a pivot for the atlas, so A is true.
2. The atlas lacks a centrum, so R is true but does not explain the rotation.

Teacher's Note:
1. Atlas has no centrum.
2. Axis has the odontoid process.

Answer: (a) A

Explanation:
1. Pronation and supination of the hand are possible in humans.
2. The radius and ulna articulate by a pivot joint, which explains these movements.

Teacher's Note:
1. Radius rotates over ulna.
2. Pivot joint.