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BIOLOGY [2 Mark Question Answer]

The Skeletal System · ICSE STD 9 (ICSE - English Medium). 10 questions.

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[2 Mark Question Answer]

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Question 12 Marks
What are the various parts of a human skeleton?
Answer
The various parts of a human skeleton are:
$(i)$ Axial skeleton: This consists of skull, vertebral column, sternum and ribs
$(ii)$ Appendicular skeleton: It consists of pectoral and pelvic girdles and bones of limbs
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Question 22 Marks
What are the two principal divisions of the skeleton in vertebrates?
Answer
(i) Axial skeleton
(ii) Appendicular skeleton
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Question 32 Marks
How many vertebrae are found in human neck? Give their names.
Answer
There are seven cervical vertebrae. First vertebra is called atlas, second is axis while the rest are called typical cervical vertebrae.
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Question 42 Marks
Name the longest and the smallest bone of the human body.
Answer
Longest bone - Femur
Smallest bone - Stapes of middle ear.
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Question 52 Marks
How do biceps and triceps work?
Answer
Biceps muscles first contract to bend the arm, following which the triceps muscles act to straighten the arm. Thus act in opposite ways and are antagonistic muscles, since they counteract each other's action. The muscles of biceps are called flexor muscle while that of the triceps is the extensor muscle. This whole coordination of muscular action is under the nerve impulse and brain control.
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Question 62 Marks
Name the bones that make up upper arm and lower limb of man.
Answer
Forelimbs consists of one humerus (anterior arm bone), one radius and one ulna (posterior arm bones), $8$ carpals (wrist bones), $5$ metacarpals (palm bones) and $14$ phalanges (finger bones).
Hind limb consists of one femur bone or thigh bone, one tibia and fibula which are bones of the leg, $8$ tarsal (bones of ankle), $5$ metatarsals (bones of feet), and $14$ phalanges (bones of fingers).
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Question 72 Marks
What is the ball and socket joint and where are they present in the body?
Answer
In a ball and socket joint, the ball of one bone is fitted into the socket of another bone such that the ball can move in the socket. Such a joint always involves a long bone, which can move in all planes. This type of joint is found in pectoral girdle, glenoid cavity, femur and acetabulum of pelvic girdle.
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Question 82 Marks
Name any two types of movable joints found in the body of man.
Answer
$(i)$ Ball and socket joint
$(ii)$ Pivot joint
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Question 92 Marks
Name three types of levers found in the human skeleton
Answer
The three levers found in the human skeleton are:
$(i)$ First order levers
$(ii)$ Second order levers
$(iii)$ Third order levers
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Question 102 Marks
Describe the fore and hind limbs of man.
Answer
Forelimbs: It consists of one humerus $($anterior arm bone$)$, one radius and one ulna $($posterior arm bones$)$, $8$ carpals $($wrist bones$)$, $5$ metacarpals $($ palm bones$)$ and $14$ phalanges $($finger bones$)$.
Hindlimb: It consists of one femur bone or thigh bone, one tibia and fibula which are bones of the leg, $8$ tarsals $($bones of ankle$)$, $5$ metatarsals $($bones of feet$)$, and $14$ phalanges $($bones of fingers$)$.
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[2 Mark Question Answer] - BIOLOGY STD 9 Questions - Vidyadip