Get complete Class 5 Science Chapter 3 The Locomotor System question answers, MCQs, fill in the blanks, true or false, match the following, short and long answers, HOTS questions, and revision notes .
Let’s Recall
Tick (✓) the right answer.
- How many bones are there in the skull?
(a) 22 (b) 32 (c) 26 (d) 28
Answer: (a) 22
- Which joint allows maximum movement?
(a) Pivot joint (b) Ball and socket joint (c) Gliding joint (d) Hinge joint
Answer: (b) Ball and socket joint
- What protects the brain?
(a) Ribcage (b) Vertebral column (c) Skull (d) Limbs
Answer: (c) Skull
- Which joint allows our head to move up, down and sideways?
(a) Hinge joint (b) Pivot joint (c) Gliding joint (d) Ball and socket joint
Answer: (b) Pivot joint
- Backbone is made up of ____________.
(a) Vertebrae (b) Cartilages (c) Muscles (d) Ligaments
Answer: (a) Vertebrae
Fill in the blanks with appropriate words.
- The human skeleton encloses and protects many __________ organs of the body.
Answer: Internal
- The muscles which are under our control are called __________ muscles.
Answer: Voluntary
- __________ protects bones from wear and tear.
Answer: Cartilage
- There are about __________ muscles in our body.
Answer: 640
- The vertebral column protects the delicate __________ cord.
Answer: Spinal
Write ‘T’ for True and ‘F’ for False statements.
- Muscles are attached to bones by ligaments.
Answer: F
Correct Statement: Muscles are attached to bones by tendons.
- Ribcage protects the heart and lungs.
Answer: T
- Gliding joint is present in wrists.
Answer: T
- Cardiac muscles are voluntary in action.
Answer: F
Correct Statement: Cardiac muscles are involuntary.
- Femur is the longest bone in forelimb.
Answer: F
Correct Statement: Femur is the longest bone in the hind limb (leg).
Match the following.
| Column A | Column B | Answer |
| 1. Stapes | (c) The smallest bone | 1 → (c) |
| 2. Backbone | (d) Protects spinal cord | 2 → (d) |
| 3. Floating ribs | (e) Last two pairs of ribs | 3 → (e) |
| 4. Sternum | (a) A bone in the centre of chest | 4 → (a) |
| 5. Thigh bone | (b) Femur | 5 → (b) |
Short Answer Questions
- Name the different kinds of movable joints in your body.
Answer:
The four kinds of movable joints are:
- Hinge joint
- Ball and socket joint
- Pivot joint
- Gliding joint
- What are immovable joints? Where are they located?
Answer:
Immovable joints are joints that do not allow movement. They are found between the bones of the skull, except the lower jaw.
- What are tendons?
Answer:
Tendons are strong fibrous tissues that attach muscles to bones.
- Which part of the facial region is movable? How does it help us?
Answer:
The lower jaw is the movable part of the face. It helps us chew food, speak and open and close the mouth.
- What is the difference between voluntary and involuntary muscles?
Answer:
| Voluntary Muscles | Involuntary Muscles |
| Work under our control. | Work without our control. |
| Found in arms and legs. | Found in organs like the stomach and intestines. |
- What is bone marrow?
Answer:
Bone marrow is the soft tissue present inside some bones. It produces blood cells.
- Long Answer Questions
- What is a joint? Describe the different types of joints present in our body with examples.
Answer:
A joint is the place where two or more bones meet.
Types of joints are:
- Hinge Joint: Allows movement in one direction. Examples: Elbow and Knee.
- Ball and Socket Joint: Allows movement in all directions. Examples: Shoulder and Hip.
- Pivot Joint: Allows the head to move up, down and sideways. Example: Neck.
- Gliding Joint: Allows bones to slide over one another. Examples: Wrist and Ankle.
- Describe the bones of backbone and limbs.
Answer:
The backbone is made up of 33 small bones called vertebrae. These form the vertebral column and protect the spinal cord.
We have two pairs of limbs:
- Forelimbs (arms)
- Hind limbs (legs)
The thigh bone (femur) is the longest bone in the body.
- Mention various functions of our skeletal system.
Answer:
The skeletal system:
- Gives shape and support to the body.
- Protects internal organs.
- Helps in movement.
- Produces blood cells in the bone marrow.
- Describe the bones of the ribcage.
Answer:
The ribcage consists of 12 pairs of ribs. The ribs are attached to the sternum in front and the backbone at the back. The last two pairs are called floating ribs because they are not attached to the sternum. The ribcage protects the heart and lungs.
- Describe three types of muscles. How do muscles work?
Answer:
The three types of muscles are:
- Voluntary muscles: Work under our control.
- Involuntary muscles: Work automatically without our control.
- Cardiac muscles: Found only in the heart and work continuously.
How muscles work:
Muscles work in pairs. When one muscle contracts, the other relaxes. Together they help move the bones and different parts of the body.
- HOTS Questions
- Imagine your neck joint to be a hinge joint. What kind of movement would you find very difficult to make?
Answer:
I would not be able to turn my head from side to side. I could only move it forward and backward.
- If the lower jaw was not movable, what activities would you not be able to do?
Answer:
I would not be able to chew food, speak properly or open and close my mouth.
- What would happen if our backbone was made of one single bone?
Answer:
Our body would become stiff. We would not be able to bend, twist or move our back easily.