5.

Question 1

With reference to the human skeletal system, consider the following statements:

1 Joints are the only points in the body where movement is possible.
2 Bones are capable of bending due to their elastic properties.
3 The elbow joint allows movement in all directions.
Which of the statements given above is/are correct?
(a) 1 only
(b) 1 and 2 only
(c) 3 only
(d) None of the above

Answer 1

Answer:
(a) 1 only

Explanation:
Statement 1: Correct. Movement in the human body occurs at joints where bones meet.
Statement 2: Incorrect. Bones are rigid and cannot bend; they facilitate movement only through joints.
Statement 3: Incorrect. The elbow joint is a hinge joint, permitting movement in only one plane (back and forth).

Question 2

Joint Type Example
1. Pivot Neck joint between atlas and axis
2. Ball and Socket Elbow joint
3. Hinge Knee joint
Which of the pairs given above is/are correctly matched?
(a) 1 and 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2, and 3

Answer 2

Answer:
(b) 1 and 3 only

Explanation:
Pair 1: Correct. The neck joint between the atlas and axis bones allows rotational movement and is a pivot joint.
Pair 2: Incorrect. The elbow is a hinge joint, not a ball and socket joint.
Pair 3: Correct. The knee is a hinge joint, allowing movement in one direction.

Question 2

Which of the following correctly matches the type of joint with its movement?

Type of Joint Movement Allowed
A. Ball and Socket 1. Movement in one direction only
B. Hinge 2. Rotational and circular movement
C. Pivot 3. Side-to-side movement
D. Gliding 4. Sliding motion between bones
Select the correct code:
(a) A-2, B-1, C-3, D-4
(b) A-2, B-1, C-4, D-3
(c) A-1, B-2, C-3, D-4
(d) A-4, B-3, C-2, D-1

Answer 2

Answer:
(a) A-2, B-1, C-3, D-4

Explanation:
Ball and Socket Joint: Allows movement in all directions, including rotation (e.g., shoulder).
Hinge Joint: Enables movement in one plane (e.g., elbow).
Pivot Joint: Allows rotation around a fixed point (e.g., neck).
Gliding Joint: Allows sliding motion between bones (e.g., wrist and ankle).

Question 3

With respect to the role of bones in movement, consider the following statements:

1 Bones in the human body are held together by ligaments.
2 Cartilage prevents friction between bones at joints.
3 Tendons are responsible for connecting bones to one another.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 2 only
(c) 1 and 3 only
(d) 1, 2, and 3

Answer 3

Answer:
(a) 1 and 2 only

Explanation:
Statement 1: Correct. Ligaments connect bones to each other at joints.
Statement 2: Correct. Cartilage reduces friction and provides cushioning at joint surfaces.
Statement 3: Incorrect. Tendons connect muscles to bones, not bones to bones.

Question 3

Which of the following best describes the significance of the ball and socket joint?
(a) Provides stability to the skeletal structure.
(b) Allows multi-directional movement and rotation.
(c) Prevents excessive friction between bones.
(d) Limits the movement to one plane for controlled actions.

Answer 3

Answer:
(b) Allows multi-directional movement and rotation.

Explanation: The ball and socket joint (e.g., shoulder and hip) permits movement in all directions, including rotation, providing maximum flexibility.

Question 4

With reference to the human skeleton, consider the following statements:

1 The skeleton protects all internal organs from physical damage.
2 The human skeleton is primarily responsible for body movement and posture.
3 Cartilage is found exclusively in the joints of the human skeleton.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) None of the above

Answer 4

Answer:
(b) 2 only

Explanation:
Statement 1: Incorrect. While the skeleton protects many organs (e.g., skull for the brain, ribs for lungs and heart), not all organs are protected (e.g., abdominal organs like intestines have no bony protection).
Statement 2: Correct. The skeleton provides structure and posture while working with muscles to facilitate movement.
Statement 3: Incorrect. Cartilage is not limited to joints; it is also found in other areas such as the nose, ears, and trachea.

Question 5

Which of the following animals use alternate contraction and relaxation of muscles for movement?

1 Earthworm
2 Fish
3 Snake
Select the correct answer using the code below:
(a) 1 only
(b) 1 and 2 only
(c) 1, 2, and 3
(d) 2 and 3 only

Answer 5

Answer:
(c) 1, 2, and 3

Explanation:
Earthworm: Moves by contracting and relaxing its body muscles while using bristles for grip.
Fish: Uses alternating loops on either side of the body to swim.
Snake: Slithers by creating loops alternately on either side, aided by muscles.

Question 6

Consider the following pairs regarding movement mechanisms in animals:

Animal Mechanism of Movement
1. Cockroach Uses muscles attached to an inner skeleton
2. Birds Strong muscles and hollow bones assist in flight
3. Fish Movement facilitated by fins and tail
Which of the pairs given above is/are correctly matched?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2, and 3

Answer 6

Answer:
(b) 2 and 3 only

Explanation:
Pair 1: Incorrect. Cockroaches have an outer skeleton (exoskeleton) rather than an inner skeleton.
Pair 2: Correct. Birds use strong breast muscles and hollow bones to aid in flight.
Pair 3: Correct. Fish rely on fins and tail to propel themselves through water

Question 7

With respect to animal locomotion, which of the following statements is correct?
(a) All animals with an exoskeleton lack the ability to fly.
(b) Snakes move by creating waves on both sides of their body.
(c) Fish and snakes share the same mechanism of movement.
(d) Birds use lightweight muscles to generate thrust for flying.

Answer 7

Answer:
(b) Snakes move by creating waves on both sides of their body.

Explanation:
Option (a): Incorrect. Animals with an exoskeleton, like cockroaches, can fly.
Option (b): Correct. Snakes create loops (or waves) alternately on each side to move forward.
Option (c): Incorrect. Although both use waves, fish depend on fins and water resistance, while snakes rely on muscle thrust against the ground.
Option (d): Incorrect. Birds use strong muscles, not lightweight ones, to generate the thrust needed for flight.

Question 8

What is the role of bristles in earthworm movement?
(a) They protect the earthworm from predators.
(b) They increase grip on the ground during locomotion.
(c) They help in absorbing nutrients from the soil.
(d) They play a role in the earthworm’s reproduction process.

Answer 8

Answer:
(b) They increase grip on the ground during locomotion.

Explanation: Bristles (setae) on the underside of the earthworm’s body anchor it to the ground, enabling efficient movement during muscle contractions.

Question 9

Which of the following joints allows a cylindrical bone to rotate within a ring?
a) Ball and socket joint
b) Hinge joint
c) Pivotal joint
d) Fixed joint

Answer 9

Answer: c) Pivotal joint

Question 9

How many vertebrae are present in the human backbone?
a) 12
b) 24
c) 33
d) 206

Answer 9

Answer: c) 33

Question 10

What is the function of cartilage in the human body?
a) Formation of the skull
b) Joining bones to muscles
c) Allowing flexibility in joints
d) Facilitating muscle contraction
Answer: c) Allowing flexibility in joints

Question 11

Which part of a cockroach helps it to fly?
a) Outer skeleton
b) Breast muscles
c) Pelvic bones
d) Bristles
Answer: b) Breast muscles

Question 12

Which type of joint is present in the human elbow?
a) Ball and socket joint
b) Pivotal joint
c) Hinge joint
d) Fixed joint
Answer: c) Hinge joint

Question 13

How do muscles work to move bones?

Answer 13

A: Muscles work in pairs; one contracts to pull a bone, while the other relaxes.

Question 14

How many ribs are present in the human rib cage?

a) 10 pairs
b) 11 pairs
c) 12 pairs
d) 13 pairs

Answer 14

Answer: c) 12 pairs

Explanation:
The rib cage has 12 pairs of ribs, which form a protective structure for the heart and lungs.

Question 15

How many bones are found in the human skull?

a) 20
b) 22
c) 25
d) 28

Answer 15

Answer: b) 22

Explanation:
The human skull consists of 22 bones, which include cranial and facial bones.

Question 16

How many bones are present in the human wrist?

a) 6
b) 8
c) 10
d) 12

Answer 16

Answer: b) 8

Explanation:
The human wrist is composed of 8 small bones called carpals, arranged in two rows.

Question 17

How many bones make up the human pelvic girdle?

a) 2
b) 3
c) 4
d) 6

Answer 17

Answer: b) 3

Explanation:
The pelvic girdle is made up of three fused bones: the ilium, ischium, and pubis.

Question 18

Question 1:
Consider the following statements regarding fibrous joints:

1 These joints are immovable and primarily serve the purpose of structural support.
2 The ribcage is an example of a fibrous joint.
3 The upper jaw is formed by the fusion of bones in a fibrous joint.
Which of the statements given above is/are correct?

a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3

Answer 18

Answer: b) 1 and 3 only

Explanation:
Fibrous joints are immovable and include the skull and upper jaw. The ribcage is an example of a cartilaginous joint, not a fibrous joint.

Question 19

Which of the following correctly differentiates between cartilaginous joints and synovial joints?

a) Cartilaginous joints allow for free movement, whereas synovial joints allow limited movement.
b) Synovial joints have a synovial fluid for lubrication, whereas cartilaginous joints do not.
c) Cartilaginous joints include the shoulder and wrist joints, whereas synovial joints include the ribcage and spinal column.
d) Synovial joints are temporary during childhood, whereas cartilaginous joints are permanent.

Answer 19

Answer: b) Synovial joints have a synovial fluid for lubrication, whereas cartilaginous joints do not.

Explanation:
Synovial joints allow free movement due to the presence of synovial fluid. Cartilaginous joints, such as the ribcage and spinal column, lack this fluid and provide limited movement.

Question 20

Which of the following statements regarding synchondrosis joints is correct?

a) They are permanent joints found in adults.
b) They are formed by the fusion of two bones with cartilage.
c) They are temporary joints found during growth and development.
d) They allow a wide range of movement in the skeletal system.

Answer 20

Answer: c) They are temporary joints found during growth and development.

Explanation:
Synchondrosis joints are cartilaginous joints found in children, such as epiphyseal plates, and are replaced by bone after puberty.

Question 21

At birth, a human baby typically has approximately —— bones

Answer 21

300 bones.

Question 22

What are sutures in the human body?
a) Movable joints found in the spine
b) Immovable fibrous joints found in the skull
c) Flexible joints found in the ribcage
d) Partly movable cartilaginous joints in the pelvis

Answer 22

Answer: b) Immovable fibrous joints found in the skull