CBSE Class 11 Biology Locomotion and Movement MCQs Set 05

Question: Match the following
A. A-band
B. I-band
C. Sarcomere
D. H-zone
E. Myosin
F. Actin, troponin, tropomyosin

Options :
(a) A–V, B–IV, C–VI, D–VII, E–II, F–III, G–I
(b) A–V, B–IV, C–III, D–VII, E–II, F–I, G–VI
(c) A–V, B–IV, C–VI, D–VII, E–III, F–I, G–II
(d) A–V, B–IV, C–VI, D–I, E–II, F–III, G–II
Answer: c

Question: Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is false?
A. Each actin (thin filament) is made of 2F (filamentous) actin
B. F-actin is the polymer of G (globular) actin
C. 2F-actins are twisted into a helix
D. Two strands of tropomyosin lie in the grooves of F-actin
E. Troponin forms the head of the myosin molecule
F. The myosin is a polymerised protein
Options :
a) A,C,G
b) Only G
c) Only F
d) Only C
Answer: c

Question: Myofibrils show alternate dark and light bands in
a) Cardiac muscles
b) Smooth muscles
c) Striped muscles
d) Cardiac muscles and Striped muscles
Answer: d

Question: Z-line divides the myofibrils into
a) Sarcomere
b) Sarcolemma
c) Sarcosome
d) Microtubules
Answer: a

Question: Tropomyosin is moved by which of the following proteins
a) Calmodulin
b) Actin
c) Troponin
d) Acetylcholine
Answer: c

Question: The fascia surrounding a muscle is made up of
a) Cartilage
b) Collagenous connective tissue
c) Adipose tissue
d) Blood vessels
Answer: b

Question: Which of the following statement is false?
a) Smooth muscles are found in urinary bladder, alimentary canal and genital tract
b) A striated muscle is syncytium (multinucleated)
c) The cytoplasm of striated muscle is called endoplasm
d) The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively
Answer: c

Question: Which of the following statements about visceral muscles is correct?
a) They are non-striated muscles
b) They are voluntary muscles
c) They are primarily involved in locomotory actions
d) All
Answer: a

Question: Which of the following is smallest one?
a) Muscle fibre
b) Myofibril
c) Actin
d) Sarcomere
Answer: d

Question: Light bands contain actin and are called
a) A-bands or isotropic band
b) A-bands or anisotropic bands
c) I-bands or isotropic bands
d) I-bands or anisotropic bands
Answer: c

Question: The Cross bridges of Sarcomere in skeletal muscle is made up of
a) Actin
b) Myosin
c) Troponin
d) Mysin
Answer: b

Question: Which of the following statement is correct?
a) Cytoplasmic streaming helps in pseudopodia formation or amoeboid movement
b) Cytoplasmic streaming is caused by contraction of microfilament
c) Both (a) and (b)
d) Locomotion is not a voluntary movement
Answer: c

Question: Which of the following statement is false?
a) Locomotion and many other movements require coordinated muscular activities
b) Muscle is a specialized tissue of endodermal origin
c) There are about 639 muscles which contributes about 40-50% of adult body weight
d) Muscles show contractibility, excitability and conductivity
Answer: b

Question: Following is the figure of actin filaments

a) A-tropomyosin, B-troponin, C-F-actin
b) A-troponin, B-myosin, C-tropomyosin
c) A-troponin, B-tropomyosin, C-myosin
d) A-troponin, B-tropomyosin, C-F-actin
Answer: d

Question: Which of the following statements about the striated muscles is false?
A. In the centre of each I-band is an elastic fibre (z-line) which bisects it
B. Thin filaments are firmly attached to the Z-line
C. M-line is a fibrous membrane in the middle of A-bands
D. A sarcomere comprises one full A-band and 2 half I-bands
Options :
a) All
b) D
c) A and B
d) None
Answer: d