Class 11-Biology-chapter 17 – : Locomotion and Movement InstructionTotal Questions : 20Total time :20 minTotal Marks : 20 x 3 = 60 MarksEach Correct Question carries : 3 MarksEach incorrect Question Carries : -1 MarksEach Unattempted Question carry : 0 MarksBe careful On Negative Markings 1. Skeletal muscles are striated as They are made up of many fibres. They show a pattern of cross-banding. They have many blood vessels. They are made up of very few fibrils. None 2. Which one of the following pairs of chemical substances is correctly categorized? Troponin and myosin - Complex proteins in striated muscles Secretin and rhodopsin - Polypeptide hormones Calcitonin and thymosin - Thyroid hormones Pepsin and prolactin - Two digestive enzymes secreted in stomach None 3. The term tetanus refers to The state of muscle fatigue caused by depletion of ATP and accumulation of lactic acid3 A stronger contraction resulting from multiple motor unit summation The partial sustained contraction of major supporting muscles The result of wave summation, which produces a smooth and sustained contraction of a muscle None 4. Which of the following contractile proteins contributes 55% of muscle protein by weight ? Actin Myosin Tropomyosin Troponin None 5. An age-dependent disorder characterized by increased fragility and low bone mass resulting from deficiency of Ca and vitamin D is Rickets Osteoarthritis Oesteoporosis Rheumatoid arthritis None 6. The further treatment of fibres with saturated salt solutions removes actin and its two associated proteins tropomyosin and troponin and also destroy the I-bands. This shows that the thin filaments are made up of................. proteins. None of the above Myosin Actin Tropomyosin and troponin None 7. Select the correct statement regarding the specific disorder of muscular or skeletal system Gout - inflammation of joints due to extra deposition of calcium Muscular dystrophy - age related shortening of muslces Myasthenia gravis- auto immune disorder which inhibits sliding of myosin filaments Osteoporosis - decrease in bone mass and higher chances of fractures with advancing age None 8. If the skeletal muscle fibres are soaked and treated with high concentration of salts, large quantities of proteins are removed. The fibres can no longer contract and the A-bands disappear. This shows that Actin is essential for contraction Proteins do not play any role in the contraction of fibres Both myosin and actin are essential for contraction Myosin is essential for contraction of the fibres None 9. Upon stimulation of skeletal muscles, calcium is immediately made available for binding to troponin from lymph bone Wood sarcoplasmic reticulum None 10. The H-zone in the skeletal muscle fibre is due to The central gap between actin filaments extending through myosin filaments in the A-band The absence of myofibrils in the central porhon of A-band Extension of myosin filaments in the central portion of the A-band The central gap between myosin filaments in the A-bands None 11. The joint between skull and atlas which allows nodding movement is called _______. Atlanto-axial joint Occipital condyle Atlanto-occipital joint None of the above None 12. The characteristic and an example of a synovial joint in humans is Fluid filled synovial cavity between two bones : Joint between atlas and axis Fluid cartilage between two bones, limited movement : Knee joint Lymph filled between two bones, limited movement : Gliding joint between carpals Fluid filled between two joints, provides cushion : Skull bones None 13. The globular head of myosin contains ATPase enzyme. Troponin Calcium ions in large quantities. ATP None 14. The intervertebral discs are pads of cartilage placed between two adjacent vertebrae; the regions of the vertebrae that are in contact with these pads are Centra Spinous processes Transverse processes Articulating facets None 15. The contraction of one of the muscle rotates the forearm to turn the palm downward or backward. Identify the muscle from the following. Pronator Abductor Extensor Flexor and adductor None 16. An acromian process is characteristically found in the Skull of frog Pelvic girdle of mammals Pectoral girdle of mammals Sperm of mammals None 17. Select the correct statement regarding the specific disorder of muscular or skeletal system. Myasthenia gravis - Autoimmune disorder which inhibits sliding of myosin filaments Osteoporosis - decrease in bone mass and higher chances of fractures with advancing age Gout - Inflammation of joints due to extra deposition of calcium. Muscular dystrophy - age related shortening of muscles None 18. Which one of the following is correctly matched? List IA Cytosine, uracil, thiamineB Malleus, incus, cochleaC Ilium, ischium, pubisD Actin, myosin, rhodopsin List II1 Pyrimidines2 Ear ossicles3 Coxal bones of the pelvic girdle4 Muscle proteins A B D C None 19. Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency? Relaxin- Gigantism Parathyroid hormone- Tetany Insulin- Diabetes insipidus Prolactin- Cretinism None 20. The thin filaments of a myofibril contain two filaments of ___(A)__ actin and __(B)__ protein along with __(C)___ protein for masking binding site for myosin. A - 1F, B - tropomyosin, C - troponin A - 2F, B - troponin, C - tropomyosin A - F, B - troponin, C - Tropomyosin A - F, B - tropomyosin, C - troponin None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
