Grade 11 : Biology - Locomotion and Movement (Set 1)

Question 1

Amoeboid movement in human specialized cells is typically exhibited by which of the following?

Accepted Answer

B) Macrophages and leucocytes

Answer

A) Red blood cells

Answer

C) Ciliated epithelial cells

Answer

D) Nerve cells

Question 2

Ciliary movement is primarily observed in which part of the human internal tubular organs?

Accepted Answer

B) Trachea and fallopian tubes

Answer

A) Skeletal muscle fibers

Answer

C) Cardiac stomach

Answer

D) Capillaries

Question 3

Which of the following muscle types is non-striated and involuntary in action?

Accepted Answer

B) Visceral (smooth) muscle

Answer

A) Skeletal muscle

Answer

C) Cardiac muscle

Answer

D) Voluntary muscle

Question 4

The anatomical functional unit of muscle contraction in a myofibril is called the:

Accepted Answer

B) Sarcomere

Answer

A) Sarcolemma

Answer

C) Myofilament

Answer

D) Cross-bridge

Question 5

A single sarcomere is defined as the region of a myofibril situated between two consecutive:

Accepted Answer

C) Z-lines

Answer

A) A-bands

Answer

B) I-bands

Answer

D) M-lines

Question 6

Which protein masks the active myosin-binding sites on actin filaments during the resting state of muscle?

Accepted Answer

B) Tropomyosin

Answer

A) Troponin

Answer

C) Meromyosin

Answer

D) Titin

Question 7

During muscle contraction, calcium ions released into the sarcoplasm bind to which protein subunit?

Accepted Answer

C) Troponin

Answer

A) Myosin head

Answer

B) F-actin

Answer

D) Tropomyosin

Question 8

According to the sliding filament theory, which region of the sarcomere shortens or disappears during contraction?

Accepted Answer

B) H-zone

Answer

A) A-band

Answer

C) Myosin filament length

Answer

D) Thick filament width

Question 9

How many total bones constitute the adult human axial skeleton?

Accepted Answer

B) 80

Answer

A) 126

Answer

C) 206

Answer

D) 28

Question 10

How many pairs of ribs are directly attached ventrally to the sternum (true ribs)?

Accepted Answer

B) 7 pairs

Answer

A) 12 pairs

Answer

C) 3 pairs

Answer

D) 2 pairs

Question 11

Rib pairs 11 and 12 are called floating ribs because:

Accepted Answer

B) Their ventral ends are not connected to the sternum

Answer

A) They attach directly to sternal cartilage

Answer

C) They do not articulate with thoracic vertebrae

Answer

D) They are completely composed of cartilage

Question 12

What is the standard number of cervical vertebrae present in almost all mammals, including humans?

Accepted Answer

B) 7

Answer

A) 5

Answer

C) 12

Answer

D) 8

Question 13

The joint between the atlas (first vertebra) and axis (second vertebra) is an example of a:

Accepted Answer

B) Pivot joint

Answer

A) Hinge joint

Answer

C) Ball and socket joint

Answer

D) Gliding joint

Question 14

Which type of joint is present between the flat cranial bones of the human skull?

Accepted Answer

A) Fibrous joint

Answer

B) Cartilaginous joint

Answer

C) Synovial joint

Answer

D) Saddle joint

Question 15

The joint present between adjacent vertebrae in the human vertebral column is classified as a:

Accepted Answer

B) Cartilaginous joint

Answer

A) Fibrous joint

Answer

C) Ball and socket joint

Answer

D) Hinge joint

Question 16

Repeated strenuous activation of skeletal muscle causes muscle fatigue primarily due to accumulation of:

Accepted Answer

B) Lactic acid

Answer

A) Pyruvic acid

Answer

C) Acetic acid

Answer

D) Uric acid

Question 17

An autoimmune disorder affecting neuromuscular junctions that causes progressive fatigue and weakness of skeletal muscle is:

Accepted Answer

B) Myasthenia gravis

Answer

A) Muscular dystrophy

Answer

C) Tetany

Answer

D) Osteoarthritis

Question 18

Tetany is characterized by rapid, wild spasms in body muscles caused by low concentration of which ion in body fluids?

Accepted Answer

C) Calcium ion ($Ca^{2+}$)

Answer

A) Sodium ion ($Na^+$)

Answer

B) Potassium ion ($K^+$)

Answer

D) Chloride ion ($Cl^-$)

Question 19

Osteoporosis is an age-related musculoskeletal disorder characterized by reduced bone mass, commonly associated with decreased levels of:

Accepted Answer

B) Estrogen

Answer

A) Progesterone

Answer

C) Insulin

Answer

D) Thyroid hormone

Question 20

Gout is an inflammatory disorder of joints caused primarily by the accumulation and deposition of:

Accepted Answer

B) Uric acid crystals

Answer

A) Calcium carbonate crystals

Answer

C) Lactic acid deposits

Answer

D) Cholesterol crystals

Grade 11 : Biology - Locomotion and Movement (Set 1)