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1. d 

2. c 

3. a 

4. b

1. b 

2. d

3. a 

4. c

A ligament is a band of strong fibrous tissue which connects a bone to a bone.

Tendon: 

1. They are made of elastic tissue.

 2. They attach muscle to a bone.

Ligament: 

1. They are short bands of tough fibrous connective tissues. 

2. They connect one bone to another

(d) Smooth muscle

Muscles are long bundles of contractile tissue, which has a fixed end (Origin) and movable end which pulls some other part.

The caudal or tail fin helps in changing direction.

1. Skull has 22 bones of which 8 bones are fixed together to form the cranium. 

2. It is called brain box since it protects the brain.

1. The skeleton system provides the hard structure or framework to the human body which supports and protects the body. 

2. It is composed of connective tissues like bones, cartilage, tendons and ligaments.

Gliding and flapping.

The hardest working muscle is found in the Eye.

1. True

2. True

3. False 

Correct statement: Pelvic girdle is a part of appendicular skeleton.

4. True

5. False 

Correct statement: Cardiac muscle is a involuntary muscle.

6. True

(c)  shoulder 

There are three types of movements: 

1. Amoeboid movement: 

It is brought about by pseudopodia which are appendages which move with movement of protoplasm within a cell.

2. Ciliary movement: 

This movement is brought about by appendages called as cilia which are the hair-like extensions of the epithelium. Both these kinds of movements are seen with cells of the lymphatic system. 

3. Muscular movement: 

It is a more complex movement which is brought about by the musculoskeletal system. This type of movement is seen in the higher vertebrates. Example: Human beings.

The movements brought about by the musculoskeletal system, comprising of the joints, skeleton and types of muscles. 

Some of the movements in body parts of human are: 

1. Movement of eyelids.

2. Movement of the heart muscles. 

3. Movement of teeth and jaw. 

4. Movement of arms and legs. 

5. Movements of head. 

6. Movements of neck.

Muscle is a bundle of contractile tissue.

1. locomotion 

2. Movement 

3. skeleton 

4. Skull facial bones. sternum. ribs, vertebral column 

5. Pelvic, Pectoral girdle 

6. Joint 

7. Smooth muscle 

8. Radial

1. chitin 

2. earthworm 

3. pivot 

4. ligament 

5. tendon 

6. Arthritis 

7. calcium, phosphorous 

8. mesoderm 

9. Stapes 

10. cranium 

11. Humerus 

12. upper jaw

1. A streamlined body is one which is pointed at the ends and broad in the middle. When such a body travels through a fluid or gaseous medium it exhibits minimum friction or resistance. A body shape which is streamlined helps cut against the friction created by the medium around the moving body.

2. Streamlined body lowers the friction drag between a fluid, air or water and an object moving trough that fluid. Drag is a force that slows down motion. Streamlining reduces the surface area of the moving object.

3. Streamlining reduces friction of movement to a minimum thus decreasing overall drag. Fishes can save energy while swimming because of the streamlined body.

In the backbone, vertebrae are joined by gliding points, which allow the body to be bent back, front or side wards.

(a) condyloid

(a) (i) and (iii)

(a) Cervical – 7

Skull is a immovable joint.

1. Ball and socket joint – Eg. Hip 

2. Hinge joint – Eg. Elbow.

There are 6 types of movable joints. 

Snail lack muscles and skeleton for movement.

(b) cartilage

(c) Upper jaw and skull

(a) To swim easily in water