Skeleton Movement and Locomotion Concise ICSE Class-9 Selina Solutions
Selina Publications Biology Chapter-12 Skeleton
Skeleton Movement and Locomotion Concise ICSE Class-9 Selina Publishers Solutions Chapter-12 . We Provide Solutions of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-12 Respiration in Plants. Visit official Website CISCE for detail information about ICSE Board Class-9
Skeleton Movement and Locomotion Concise ICSE Class-9 Selina Solutions Chapter-12
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Note :- Before Viewing Concise Solutions of Chapter-12 Skeleton-Movement and Locomotion Selina Biology Solutions. Read the whole chapter carefully with figure. Focus on
(i) Function of human skeleton
(ii) Axial and Appendicular Skeleton.
(iii) Type of joints , location and immovable joint, slightly movable joints and freely movable
( hinge joint ball and socket joint, gliding, joint, pivot joint)
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Review Question
Progress Check (page-118),Chapter-12 Skeleton-Movement and Locomotion Selina Biology Solutions
Question
Fill in the blank
(i)…….
(ii)……….
(iii)…………
(iv)………..
(v)………….
Answer
Chapter-12 Skeleton-Movement and Locomotion Progress Check (page-123) Selina Biology Solutions
Question
Mention if following statement are true(T) or False(F)
(i)…….
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(ii)……….
(iii)…………
(iv)………..
(v)………….
Answer
(i)…False
(ii)….False.
(iii)…..False.
(iv)…..True
(v)……False.
Solutions of Selina Concise Biology Chapter-12 Skeleton-Movement and Locomotion Progress Check (page-125)
Question 1
Mention if following statement are true(T) or False(F)
(i)…….
(ii)……….
(iii)…………
(iv)………..
(v)………….
Answer 1
(i)…True
(ii)….False
(iii)……True
(iv)…….False
(v)…..True
Question 2
Match …………Coulmn ii
Answer 2
Solutions of Selina Concise Biology Chapter-12 Skeleton-Movement and Locomotion A.Multiple Choice Questions
Question 1
Your external ear (pinna) is supported by
(a) Bone
(b) Cartilage
(c) Tendon
(d) Capsule
Answer 1
(b) Cartilage
Question 2
The type of joint found at shoulder is also found at
(a) Elbow
(b) Knee
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(c) Ankle
(d) Hip
Answer 2
(d) Hip
Question 3
Which one of the following categories of vertebrae are correctly matched?
(a) Cervical-7
(b) Thoracic-10
(c) Lumbar-4
(d) Sacral-4
Answer 3
(a) Cervical-7
Question 4
Human skeleton altogether contains 213 bones. Which of these are the 6 bones?
(a) Neck vertebrae
(b) Ear ossicles
(c) Carpals
(d) Metacarpals
Answer 4
(b) Ear ossicles
Solutions of Selina Concise Biology Chapter-12 Skeleton- B. VERY SHORT ANSWER TYPE
Question 1
Name the parts of the skeleton where the following are located:
transverse process, glenoid cavity, shoulder-blade, acetabulum
Answer 1
| Parts
of the skeleton |
Location |
| Transverse process | Neural arches in vertebra |
| Glenoid cavity | Pectoral girdle |
| Shoulder-blade | Shoulder girdle |
| Acetabulum | Pelvic girdle |
Question 2
Name any two parts of your body where the supporting skeleton is made of cartilage instead of bone.
Answer 2
- External Ear
- Tip of the nose
C. SHORT ANSWER TYPE Solutions of Selina Concise Biology Chapter-12 Skeleton
Question 1
What is the difference between a true rib and a floating rib?
Answer 1
| True rib | Floating rib |
| 1. The first seven pairs of ribs are called true ribs. | 1. The last two, i.e., 11th and 12th pairs of ribs are called floating ribs. |
| 2. They are attached in front of the sternum by means of costal cartilages. | 2. They are not attached to the sternum at all. |
Question 2
Do the muscles pull the structures, or push them? Explain briefly.
Answer 2
Muscles pull the structure. A muscle has two ends; a fixed end where the muscle originates and a movable end that pulls some other part. The movable end is drawn out to form a tough structure known as a tendon that is attached to the bone.
When a muscle is stimulated by a nerve, it contracts and becomes shorter and thicker and this pulls the bone at its movable end. Muscles can only contract and relax, they cannot lengthen.
Question 3
Just as the humerus corresponds to femur, what bones correspond to tarsals, metacarpals, ulna and radius respectively?
Answer 3
| Bones | Corresponding bones |
| Humerus | Thigh bone (Femur) |
| Tarsals | Carpals |
| Metacarpals | Metatarsals |
| Ulna | Fibula |
| Radius | Tibia |
Question 4
What are antagonistic muscles? Give one example.
Answer 4
Once a structure has been moved by a muscle, it cannot return to its original position without another muscle acting on it. Muscles that cause opposing movements are known as antagonistic muscles.
Example of antagonistic muscles:
When you flex your arm at the elbow, the muscle that lies above the upper arm, i.e. the biceps is seen and felt bulging. This muscle bulges due to contraction and becomes smaller in length, stiffer and thicker. Contraction of biceps draws the forearm towards the upper arm. However, relaxation of biceps cannot push the forearm back to its original position.
When the arm is extended or straightened, the muscle at the back of the upper arm, i.e. the triceps contracts. The two muscles work antagonistically or in opposite directions to bend or flex and straighten the arm at the elbow.
Question 5
Some people in old age complain of stiff joints. What do you think could be a possible reason for it?
Answer 5
Some joints like shoulder joint, knee joint need to be held firmly in position to be well-lubricated. Such joints contain a lubricating fluid called synovial fluid, which serves as a cushion between the bones and removes friction during movements.
As we age, the joint movement becomes stiffer and less flexible because the amount of lubricating fluid inside the joints decreases and the cartilage becomes thinner. Ligaments also tend to shorten and lose some flexibility, making the joints feel stiff.
D. LONG ANSWER TYPE Solutions of Selina Concise Biology Chapter-12 Skeleton
Question 1
What are the uses of the skeleton in our body?
Answer 1
Uses of skeleton:
(i) Support and shape:
The skeletal system provides a framework to the body. It provides support to all soft parts and gives a definite shape to the body and all body parts.
(ii) Protection:
The skeleton protects the internal delicate and important organs of the body. For example in human beings, the skull protects the brain, ribs protect the heart and lungs, vertebral column protects the spinal cord, etc.
(iii) Movement:
The skeletal system helps in movement. It co-ordinates the movement of attached bones and muscles to bring about locomotion.
(iv) Leverage:
Some bones and joints of the skeletal system form levers and help in magnifying, either the movement or the force. For example, slight contraction of biceps moves the hand to a distance of about a foot.
(v) Formation of blood cells:
The skeleton is the site of haematopoiesis. Various types of blood cells like red blood cells, white blood cells and platelets are formed in the bone marrow of some long bones.
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