Question 11 of 17
Locomotion And Movement
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Class XI · Biology practice
Locomotion and Movement PYQs
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17 questions in this collection · Page 2 of 2
Question 12 of 17
Locomotion And Movement
Which of the following muscular disorders is
inherited ?
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Question 13 of 17
Locomotion And Movement
Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans?
The lower limb consists of femur, patella, tibia-fibula and then the tarsal bones of the foot.
Question 14 of 17
Locomotion And Movement
The number of vertebrae in a human is _____.
The adult human vertebral column consists of 26 vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 1 sacrum and 1 coccyx.
Question 15 of 17
Locomotion And Movement
Match List-I with List-II:
| List-I | List-II |
|---|---|
| A. Tetany | I. Inflammation of joints |
| B. Arthritis | II. Autoimmune disorder affecting neuromuscular junction |
| C. Myasthenia gravis | III. Wild contraction in muscle due to low Ca++ in body fluid |
| D. Muscular dystrophy | IV. Progressive degeneration of skeletal muscle |
Tetany is caused by low Ca++, arthritis is inflammation of joints, myasthenia gravis is an autoimmune disorder of the neuromuscular junction and muscular dystrophy causes progressive degeneration of skeletal muscles.
Question 16 of 17
Locomotion And Movement
Choose the correct statements regarding muscle contraction.
(A) A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.
(B) The neural signal generates an action potential which causes the release of Ca++ into sarcoplasm.
(C) Increase in Ca++ inactivates the actin for breaking cross bridges.
(D) Actin binds to the myosin head to form a cross bridge.
(E) Shortening of sarcomere takes place by pulling actin filaments towards the centre of the A band.
Choose the correct answer from the options given below:
(A) A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.
(B) The neural signal generates an action potential which causes the release of Ca++ into sarcoplasm.
(C) Increase in Ca++ inactivates the actin for breaking cross bridges.
(D) Actin binds to the myosin head to form a cross bridge.
(E) Shortening of sarcomere takes place by pulling actin filaments towards the centre of the A band.
Choose the correct answer from the options given below:
Motor neurons transmit impulses to muscle fibres. Ca++ released into the sarcoplasm activates actin by binding troponin. Cross bridges form between actin and myosin, and actin filaments slide towards the centre of the A band. Statement C is incorrect because Ca++ activates, not inactivates, actin.
Question 17 of 17
Locomotion And Movement
Which of the following statements are correct with reference to human endoskeleton?
(A) Human skull is monocondylic.
(B) The joint between any two adjoining vertebrae is a cartilaginous joint.
(C) In human beings, the number of cervical vertebrae is seven.
(D) All ribs except the last two pairs are bicephalic.
(E) The occipital bone of skull is articulated with atlas vertebra.
Choose the correct answer from the options given below:
(A) Human skull is monocondylic.
(B) The joint between any two adjoining vertebrae is a cartilaginous joint.
(C) In human beings, the number of cervical vertebrae is seven.
(D) All ribs except the last two pairs are bicephalic.
(E) The occipital bone of skull is articulated with atlas vertebra.
Choose the correct answer from the options given below:
Humans possess seven cervical vertebrae. Adjacent vertebrae are connected by cartilaginous joints. The occipital bone articulates with the atlas. The human skull is dicondylic, and the last three pairs of ribs are not bicephalic.
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