CBSE Class 5 Science The Skeletal System Worksheet Set 02

Lesson - 7. The Skeletal System

I. Name the following. [FA-4 + SA-2]

Question 1. A point where two separate bones meet.
Answer: Joint
In simple words: The place where two or more bones connect is called a joint.

Exam Tip: Remember that joints are responsible for making our skeletal system flexible.

Question 2. The joint between two vertebrae.
Answer: Gliding joint
In simple words: The joint between backbone bones allows slight sliding movements.

Exam Tip: Gliding joints allow bones to slide past one another in any direction.

Question 3. A frame work of bones.
Answer: Skeleton
In simple words: The skeleton is the framework of bones that gives shape to our body.

Exam Tip: An adult human skeleton is made up of 206 bones.

Question 4. The other name for backbone.
Answer: Spine or vertebral column
In simple words: The backbone is also known as the spine.

Exam Tip: The spine consists of 33 small bones called vertebrae.

Question 5. The joint that allows movement in all directions.
Answer: Ball and socket joint
In simple words: This joint moves freely in every direction like the shoulder and hip.

Exam Tip: The rounded end of one bone fits into the hollow cup of another bone.

Question 6. The strong fibres by which the muscles are attached to the bones.
Answer: Tendons
In simple words: Tendons connect muscles to bones so they can pull them.

Question 7. The muscles which are under our control.
Answer: Voluntary muscles
In simple words: Muscles that we can move according to our will are voluntary muscles.

Exam Tip: Muscles in our arms and legs are examples of voluntary muscles.

Question 8. The other name of thigh bone.
Answer: Femur
In simple words: The femur is the longest and strongest bone in the human body.

Exam Tip: Femur is located in the upper leg.

Question 9. Tough tissues by which the bones are held together.
Answer: Ligaments
In simple words: Ligaments are strong bands that tie bones together at joints.

Exam Tip: Ligaments provide stability to joints during movement.

Question 10. Two pairs of lower ribs which are not attached to the breastbone.
Answer: Floating ribs
In simple words: The last two pairs of ribs are called floating ribs because they are only attached to the backbone.

Exam Tip: There are 12 pairs of ribs in total; the last 2 pairs are floating ribs.

II. Fill in the blanks.

Question 1. Muscles are made up of tough ________________ tissues.
Answer: muscle (or contractile)
In simple words: Muscle tissues help in body movement by contracting and relaxing.

Exam Tip: Muscle tissue is specialized for contraction.

Question 2. The ________________ covers and protects the brain.
Answer: skull
In simple words: The hard bony case called the skull protects our brain.

Exam Tip: The cranium is the part of the skull that encloses the brain.

Question 3. Muscles are attached to the bones by strong fibres called ________________.
Answer: tendons
In simple words: Tendons anchor muscles securely to bones.

Exam Tip: Tendons are extremely strong and inelastic cords.

Question 4. ________________ muscles are not under our control.
Answer: Involuntary
In simple words: Muscles that work automatically without our conscious control are involuntary muscles.

Exam Tip: Muscles of the stomach and heart are involuntary.

Question 5. The ________________ protects the heart and the lungs.
Answer: rib cage
In simple words: The cage-like bone structure in our chest protects vital organs like the heart and lungs.

Exam Tip: The rib cage is connected to the backbone at the back and breastbone in the front.

Question 6. In the upper arm there is a long bone called ________________.
Answer: humerus
In simple words: Humerus is the single bone present in the upper arm.

Exam Tip: It extends from the shoulder to the elbow.

Question 7. A break in the bone is called a ________________.
Answer: fracture
In simple words: Cracks or breaks in bones are termed fractures.

Exam Tip: Fractures require medical attention and casts to heal properly.

Question 8. The ________________ protects the spinal cord.
Answer: backbone (or vertebral column)
In simple words: The delicate spinal cord runs through and is shielded by the backbone.

Exam Tip: The vertebral column is made of 33 ring-shaped bones stacked together.

Question 9. The delicate spinal cord passes through the ________________.
Answer: backbone (or vertebral column)
In simple words: The hollow tube inside the backbone safely houses the spinal cord.

Exam Tip: This arrangement protects the central nervous system pathway.

Question 10. The ________________ and ________________ of the muscles move bones.
Answer: contraction, relaxation
In simple words: Muscles pull bones by shortening (contraction) and lengthening (relaxation).

Exam Tip: Muscles always work in pairs to move a bone back and forth.