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Locomotion and Movement Test - 24

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Locomotion and Movement Test - 24
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  • Question 1
    1 / -0
    The binding of troponin to calcium in muscle cells exposes the binding site of
    Solution
    • Muscle contraction thus results from an interaction between the actin and myosin filaments that generates their movement relative to one another. 
    • The molecular basis for this interaction is the binding of myosin to actin filaments, allowing myosin to function as a motor that drives filament sliding. Hence, The binding of troponin to calcium in muscle cells exposes the binding site of Myosin.
    So, the correct answer is 'Myosin'.
  • Question 2
    1 / -0
    The extension of arm is brought about by muscles shown in the diagram. The movement takes place when

    Solution
    Biceps brachii (1) and triceps brachii (2) are the antagonistic pair of the forearm and work opposite to one another to move the forearm in opposite direction. Contraction of biceps brachii flexes the lower arm while the contraction of triceps brachii extends it. So, when biceps brachii relaxes, triceps brachii contracts. Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Which of the following is not related to locomotion?
    Solution
    • Setae are the bristle-like structures that serve in annelid locomotion. 
    • Tendon is a connective tissue structure that connects a muscle to another muscle, or a muscle to a bone and serves to transmit the force generated by a muscle during movement. 
    • Pseudopods are the outgrowth of the membrane and serve in locomotion in protists. 
    • A hydrostatic skeleton is found in many soft-bodied animals and is surrounded by muscles to serve in locomotion. 
    • A typhlosole is an internal fold of the intestinal wall found in some mollusks, lampreys, some annelids, and echinoderms to serve as an absorption surface. 

    Therefore, the correct answer is option E.
  • Question 4
    1 / -0
    The rotational movement in humans is brought about by
    Solution
    Ball and socket joint is where a partially spherical end lies in a socket which allows multi-directional movement and rotation e.g. shoulder
    Pivot joint, also called rotary joint, or trochoid joint, is a freely moveable joint (diarthrosis) that allows only rotary movement around a single axis e.g., neck
    Plane joints permit sliding or gliding movements in the plane of articular surfaces e.g., elbow
    Saddle joints provide stability to the bones while providing more flexibility than a hinge or gliding joint e.g., wrist.
    Thus, the correct answer is option E.

  • Question 5
    1 / -0
    How do muscles attached to the bones move the body?
    Solution
    • The Muscles work by contraction and relaxation this represents that muscles can pull bones, but they can't push them back to the original position.
    • For this reason, muscles are often arranged in pairs that pull bones in opposite directions.
    • Hence muscles attached to the bones move the body by pull movement only.
    • So, the correct answer is 'Pull movement only'.
  • Question 6
    1 / -0
    Shedding of exoskeleton to replace it due to growth in body is called as
    Solution
    • Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa.
    •  Since the cuticle of these animals typically forms a largely inelastic exoskeleton, it is shed during growth and a new, larger covering is formed.
    • The remnants of the old, empty exoskeleton are called exuviae. 
    • In arthropods, such as insects, arachnids and crustaceans, Moulting is the shedding of the exoskeleton (which is often called its shell), typically to let the organism grow. Hence, Shedding of the exoskeleton to replace it due to growth in the body is called ecdysis and moulting. 
    So, the correct answer is 'Both A and B'.
  • Question 7
    1 / -0

    The functions of axial skeleton are

    Solution
    • The axial skeleton supports and protects the brain, spinal cord and many of the internal organs. 
    • It also provides sites for the attachment of other bones and muscles in the body, protect organs to excrete and digestion and also protects the nerves and blood vessels from the brain and spinal cord. Hence, The functions of the axial skeleton are To make locomotion possible, Protect the organs of excretion and Protect organs of digestion. 
      • So, the correct answer is 'All of the above'.


  • Question 8
    1 / -0
    Which of the following assist locomotion in snake
    Solution
    • Generally snakes have two kind of scales. Its top and sides are generally covered by smaller scales and The bottom of the snake is covered by short but very wide scales that look like rungs on a ladder.
    • These special scales at the bottom surface are called scutes.They form the belly of the snake and are integral in the snake’s ability to move.
    • Hence scutes assist in locomotion in snake.
    • So,the correct answer is 'Scutes'.
  • Question 9
    1 / -0
    Which of the following is true of muscle contraction?
    Solution
    •  Upon muscle contraction, the A-bands do not change their length, whereas the I-bands and the H-zone shorten.
    •  This causes the Z lines to come closer together. The protein [tropomyosin] covers the myosin binding sites of the actin molecules in the muscle cell. Hence, A-Band remains constant  is true of muscle contraction
      •  So, the correct answer is 'A-Band remains constant'.
  • Question 10
    1 / -0
    Major functions served by human skeleton are
    Solution
    • The human skeleton is the internal framework of the body. It is composed of around 270 bones at birth this total decreases to around 206 bones by adulthood after some bones get fused together. 
    • The skeletal system performs vital functions like support, movement, protection, blood cell production, calcium storage and endocrine regulation that enable us to survive. Hence, Major functions served by human skeleton are Support and movement, Storage of ions and Production of blood cells.
    So, the correct answer is 'All of the above'.
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