Locomotion and Movement

NEET Biology · 98 questions · Page 3 of 10 · Click an option or "Show Solution" to reveal answer

Q21

What will happen if ligaments are cut or broken?

A Bones will move freely at joints through cartilage and synovial fluid

B No movement at joints

C Bones will become unfixed

D Bones will become fixed

Correct Answer

Option C

Solution

(c) Ligaments are specialised connective tissues which connect bones together, hence if they are cut or broken the bone will become unfixed.

Q22

ATPase enzyme needed for muscle contraction is located in

A actinin

B troponin

C myosin

D actin

Correct Answer

Option C

Solution

Actin forms the light or I- Band.

Actin slides over myosin during contraction.

Troponin protein is involved in establishing connection with myosin cross bridges.

Actin is not involved in muscle contraction.

It is also an ATPase (an enzyme) which is activated by $Ca^{2+}$ and $Mg^{2+}$ ions.

Hence, ATPase enzyme is located in myosin.

Q23

An acromian process is characteristically found in the:

A pelvic girdle of mammals

B pectoral girdle of mammals

C skull of frog

D sperm of mammals

Correct Answer

Option B

Solution

(b) Each half of pectoral girdle has two bones i.e. clavicle and scapula.

A spine like, acromian process is attached to scapula for articulation with clavicle bone.

Q24

Which of the following pairs, is correctly matched?

A Hinge joint

-

between vertebrae

B Gliding joint

-

between zygapophyses of the successive vertebrae

C Cartilaginous

-

skull bones joint

D Fibrous joint

-

between phalanges

Correct Answer

Option B

Solution

(b) Hinge joint : elbow joint, knee joint, ankle joint, inter phalangeal joint.

Gliding joint : Intercarpal joint, intertarsal joint, sternoclavicular joint and joint between pre and post zygapophysis of adjacent vertebra.

Fibrous joint (Synarthroses) : Joints of cranium - bones.

Joints between teeth and Jaw bones.

Cartilaginous joint (Amphiarthroses): Joints between mammalian vertebrae and two innominate bones (pubic symphysis).

Q25

In human body, which one of the following is anatomically correct?

A Collar bones - 1 pair

B Salivary glands - 1 pair

C Cranial nerves - 12 pairs

D Floating ribs - 3 pairs

Correct Answer

Option D

Solution

(d) Floating ribs are $2-$ pairs $(11^{\text{th }}$ and $12^{\text{th }}$ pair) which are not attached to sternum.

Q26

Which one of the following items gives its correct total number?

A Floating ribs in humans - 3

B Amino acids found in proteins - 20

C Types of diabetes - 2

D Cervical vertebrae in humans - 7

Correct Answer

Option A

Solution

(a) In a human's total number of ribs are Fourteen (14).

These are of three types True ribs—These are 7 in number.

(2) False ribs- These are three (3) in number.

(3) Floating ribs-These are 3 in number.

Q27

Long bones function in

A support

B support, erythrocyte and leucocyte synthesis

C support and erythrocyte synthesis

D erythrocyte formation

Correct Answer

Option B

Solution

(b) Long bones provide support and their red bone marrow synthesizes blood cells (RBCs and WBCs).

Q28

Elbow joint is an example of:

A hinge joint

B gliding joint

C ball and socket join

D pivot joint

Correct Answer

Option A

Solution

(a) Elbow joint is an example of hinge joint.

The elbow is a hinge joint; it can open and close like a door.

Hinge joint is a form of diarthrosis (freely movable joint) that allows angular movement in one plane only, increasing or decreasing the angle between the bones e.g. elbow joint, knee joint etc.

Q29

Which one of the following is the correct matching of three items and their grouping category? Items Group

A ilium, ischium, pubis - coxal bones of pelvic girdle

B actin, myosin, - muscle proteins rhodopsin.

C cytosine, uracil, - pyrimidines thiamine

D malleus, incus, - ear ossicles cochlea

Correct Answer

Option A

Solution

(a) The pelvic girdle is formed by two innominate bones consists of three separate bones ilium, ischium and the pubis.

Q30

Parathormone deficiency produces muscle cramps or tetany as a result of

A lowered blood Ca2+

B enhanced blood Na+

C enhanced blood glucose

D enhanced blood Ca+

Correct Answer

Option A

Solution

(a) Parathormone deficiency lowers blood Ca2+, increasing neuromuscular excitability causing tetany.

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