MERIT YARD

Class 11th Biology - Locomotion and Movement - MERIT YARD

Question 1 / 40Which of the following is the structural and functional unit of muscle contraction?

A) Myofibril

B) Muscle fibre

C) Sarcomere

D) Sarcoplasmic reticulum

Question 2 / 40Which ion is essential for muscle contraction?

A) Na+

B) K+

C) Ca++

D) Mg++

Question 3 / 40The number of floating ribs in human body is:

A) 3 pairs

B) 2 pairs

C) 5 pairs

D) 12 pairs

Question 4 / 40The total number of bones in the human skull is:

A) 14

B) 8

C) 22

D) 30

Question 5 / 40Knee joint is an example of:

A) Hinge joint

B) Ball and socket joint

C) Pivot joint

D) Gliding joint

Question 6 / 40Which protein masks the active binding sites for myosin on actin filaments?

A) Troponin

B) Tropomyosin

C) Troponin (Correct)

D) Meromyosin

Question 7 / 40The only movable bone in the skull is:

A) Maxilla

B) Mandible

C) Ethmoid

D) Sphenoid

Question 8 / 40Accumulation of uric acid crystals in joints causes:

A) Arthritis

B) Gout

C) Osteoporosis

D) Tetany

Question 9 / 40An ATPase enzyme is located on:

A) Myosin head

B) Actin

C) Troponin

D) Z-line

Question 10 / 40The number of vertebrae in the cervical region of almost all mammals is:

A) 5

B) 7

C) 12

D) 8

Question 11 / 40Saddle joint is present between:

A) Carpal and Metacarpal of thumb

B) Atlas and Axis

C) Humerus and Pectoral girdle

D) Carpals

Question 12 / 40Red muscle fibres are rich in:

A) Sarcoplasmic reticulum

B) Myoglobin and Mitochondria

C) Lactic acid

D) DNA

Question 13 / 40Acromion process is found in:

A) Pelvic girdle

B) Pectoral girdle (Scapula)

C) Skull

D) Vertebral column

Question 14 / 40Wild contractions in muscles due to low Ca++ in body fluids is:

A) Muscular dystrophy

B) Tetany

C) Myasthenia gravis

D) Fatigue

Question 15 / 40Which bone is also called the 'Collar bone'?

A) Scapula

B) Clavicle

C) Sternum

D) Patella

Question 16 / 40The storehouse of calcium ions in muscle fibres is:

A) Sarcolemma

B) Sarcoplasmic reticulum

C) Lysosome

D) Sarcosome

Question 17 / 40During muscle contraction, which zone disappears?

A) A-band

B) H-zone

C) I-band

D) Z-line

Question 18 / 40Total number of bones in one human arm is:

A) 22

B) 25

C) 30

D) 14

Question 19 / 40Glenoid cavity articulates:

A) Pelvic girdle with femur

B) Humerus with Scapula

C) Clavicle with Scapula

D) Radius with Ulna

Question 20 / 40An autoimmune disorder affecting neuromuscular junction is:

A) Gout

B) Myasthenia gravis

C) Arthritis

D) Tetany

Question 21 / 40Which skeletal muscle is non-striated and involuntary?

A) Cardiac muscle

B) Skeletal muscle

C) Smooth muscle

D) None

Question 22 / 40The number of tarsals in each ankle is:

A) 7

B) 8

C) 5

D) 14

Question 23 / 40Elbow joint is an example of:

A) Pivot joint

B) Hinge joint

C) Saddle joint

D) Ball and socket joint

Question 24 / 40The thick filament of a muscle fibre is made of:

A) Actin

B) Myosin

C) Troponin

D) Tropomyosin

Question 25 / 40Which of the following is a U-shaped bone at the base of the buccal cavity?

A) Hyoid bone

B) Ethmoid bone

C) Malleus

D) Sternum

Question 26 / 40Sliding filament theory was proposed by:

A) Huxley

B) Watson

C) Singer

D) Brown

Question 27 / 40Smallest bone in the human body is:

A) Malleus

B) Incus

C) Stapes

D) Patella

Question 28 / 40Acetabulum is a part of:

A) Pectoral girdle

B) Pelvic girdle

C) Skull

D) Vertebra

Question 30 / 40The dark band of a myofibril is:

A) A-band

B) I-band

C) Z-line

D) H-zone

Question 31 / 40Osteoporosis is related to the deficiency of:

A) Progesterone

B) Estrogen

C) Thyroxine

D) Insulin

Question 32 / 40Pivot joint is found between:

A) Atlas and Axis

B) Humerus and Ulna

C) Carpals

D) Femur and Pelvic girdle

Question 33 / 40Which of the following is not a bone of the hind limb?

A) Femur

B) Tibia

C) Humerus

D) Fibula

Question 34 / 40Carpals are bones of the:

A) Wrist

B) Ankle

C) Palm

D) Fingers

Question 35 / 40Amoeboid movement is shown by:

A) Spermatozoa

B) Macrophages and Leucocytes

C) Ciliated epithelium

D) Muscle cells

Question 36 / 40The human vertebral column has how many vertebrae?

A) 24

B) 26

C) 33

D) 12

Question 37 / 40Sternum is a ________ bone.

A) Flat

B) Long

C) Short

D) Irregular

Question 38 / 40Presence of myoglobin is high in:

A) Red muscles

B) White muscles

C) Smooth muscles

D) None

Question 39 / 40Sutures in the skull are:

A) Fibrous joints

B) Cartilaginous joints

C) Synovial joints

D) Ball and socket joints

Question 40 / 40During muscle contraction, A-band:

A) Remains same

B) Shortens

C) Increases

D) Disappears