Selina solutions concise biology class 9 icse Solutions for Chapter 12 skeleton movement and locomotion

Exercises in Chapter 12 skeleton movement and locomotion Grade 9

Exercise

Questions in Exercise

Fill in the blanks (i) Our skeleton consists of bones ________ and ___________ (ii) ___________ is the chief component of our skeleton (iii) Shape wise the bones can be classified as ________, ________, ________ and ________ (iv) The central hollow part of the long bones is known as ________ (v) A bone becomes soft and flexible when placed in dilute ________

Mention if the following statements are true (T) or false (F)

(i) Humerus of the upper arm is the longest bone. T/F

(ii) Axial skeleton incudes shoulder and hip girdles T/F

(iii) There are 10 vertebrae in the neck T/F

(iv) There are three kinds of ribs – true, false and floating T/F

(v) The shoulder girdle is large and trough-shaped T/F

Match the bones (Column I) with the kind of joint (Column II)

Column I (Bones) Column II (Joint)

(i) Humerus and shoulder girdle (a) Partially movable

(ii) Two adjacent vertebrae (b) Gliding

(iii) Skull and upper end (c) Immovable

of the backbone

(iv) Bones of brain box (d) Ball and socket

(v) Rib and breast bone (e) Pivot

Your external ear(pinna) is supported by

(a) Bone

(b) Cartilage

(d) Capsule

The type of joint found at shoulder is also found at

(a) Elbow

(b) Knee

(d) Hip

Which one of the following categories of vertebrae are correctly numbered (a) Cervical - 7 (b) Thoracic - 10 (c) Lumbar - 4 (d) Sacral - 4

Human skeleton altogether contains 213 bones. Which of these are the 6 bones? (a) Neck vertebrae (b) Ear ossicles (c) Carpals (d) Metacarpals

Name the parts of the skeleton where the following are located: Transverse process, glenoid cavity, shoulder-blade, acetabulum.

Name any two parts of your body where the supporting skeleton is made of cartilage instead of bone.

What is the difference between a true rib and a floating rib?

Do the muscles pull the structures, or push them? Explain briefly.

Just as the humerus corresponds to femur, what bones correspond to tarsals, metacarpals, ulna and radius respectively?

Some people in old age complain of stiff joints. What do you think could be a possible reason for it?

What are the uses of the skeleton in our body?

Name the different types of joints? Give one example of each type

What is the difference between ligament and tendon? (On the basis of their function).

What are bones made of? Are the bones living or non-living? Give reason.

Given below is a diagram of human skeleton. Name the bones numbered 1-11

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Chapters in this book

Introducing Biology

Cell: The Unit Of Life

Tissues: Plant And Animal Tissues

The Flower

Pollination And Fertilization

Seeds: Structure And Germination

Respiration In Plants

Five Kingdom Classification

Economic Importance Of Bacteria And Fungi

Nutrition

Digestive System

Skeleton – Movement And Locomotion

Skin – The Jack Of All Trades

The Respiratory System

Hygiene

Diseases: Cause and Control

Aids To Health

Health Organizations

Waste Generation and Management