GSEB Class 6 Science Solutions Chapter 8 Body Movement

Question 1. Fill in the blanks:
(a) Joints of the bones help in the ............. of the body.
(b) A combination of bones and cartilages forms the ............. of the body.
(c) The bones at the elbow are joined by a ............. joint.
(d) The contraction of the ............. pulls the bones during movement.
Answer:
(a) movement
(b) skeleton
(c) hinge
(d) muscle
In simple words: The connections between bones help the body move. Bones and soft cartilage together create the body's main framework. The bones in your elbow connect using a hinge type of joint. When your muscles tighten, they pull on your bones, making them move.

Exam Tip: Remember the four main types of joints (ball and socket, pivot, hinge, fixed) and the role of muscles in movement for these fill-in-the-blank questions.

Question 2. Indicate 'true' and false' among the following sentences:
(a) The movement and locomotion of all animals are exactly the same.
(b) The cartilages are harder than bones.
(c) The finger bones do not have joints.
(d) The forearm has two bones.
(e) Cockroaches have an outer skeleton.
Answer:
(a) False
(b) False
(c) False
(d) True
(e) True
In simple words: Not all animals move and travel in the same way, so (a) is false. Cartilages are actually softer than bones, making (b) false. Finger bones do have joints, so (c) is false. The forearm has two main bones, which means (d) is true. Cockroaches possess an outside skeleton called an exoskeleton, so (e) is true.

Exam Tip: Understand the basic functions and properties of different body parts and animal characteristics to correctly identify true or false statements.

Question 3. Match the items in Column I with one or more items of Column II:

Exam Tip: For matching questions, eliminate options you are sure about first, then deduce the remaining matches. Some items might have multiple correct descriptions, but typically only one best fit will be presented in the answer key.

Answer the following questions:

Question (a) What are a ball and socket joint?
Answer: The round end of one bone fits into the empty space of another bone. This particular connection is known as a ball and socket joint. These joints let us move in many directions, like in our shoulder and hip.
In simple words: A ball and socket joint is where one bone's rounded part fits into a cup-shaped space on another bone, allowing movement in all directions, like your shoulder.

Exam Tip: When defining joints, always mention the fitting mechanism (e.g., rounded end into hollow space) and provide common examples from the human body.

Question (b) Which of the skull bones is movable?
Answer: Within the skull, only the bottom jaw bone can move.
In simple words: Only the lower jaw in the skull is capable of movement.

Exam Tip: Remember that most skull bones are fixed joints, with the lower jaw (mandible) being the key exception, crucial for eating and speaking.

Question (c) Why can our elbow not move backward?
Answer: Our elbow is unable to bend backward because it contains a hinge joint. This type of joint only permits movement in a single direction.
In simple words: Our elbow has a hinge joint, which means it can only bend one way, preventing it from moving backward.

Exam Tip: Clearly state the type of joint (hinge joint for the elbow) and explain its characteristic movement (movement in one plane) to fully answer this type of question.