Biology MCQ, Class-11th, Chapter-17, Locomotion and Movement

NCERT based Biology MCQ of Class 11th, Chapter-17, Locomotion and Movement with brief explanation for competitive exams like TGT HTET, KVS PGT, SSC and all other state competition exams.

Right Answer for MCQ will be highlighted on Hover / Click on the option.

12th Biology MCQ PDF Download

NCERT Based MCQ with Explanation:

1. What is the primary function of locomotion in animals?

(a) Reproduction

(b) Searching for food and shelter

(c) Photosynthesis

(d) Excretion

Explanation: Locomotion helps animals find food, shelter, mates, and escape predators.

2. Which movement type is caused by pseudopodia?

(a) Ciliary

(b) Amoeboid

(c) Muscular

(d) Flagellar

Explanation: Amoeboid movement occurs via pseudopodia, as seen in Amoeba and certain human cells like macrophages.

3. Ciliary movement is essential in which human process?

(a) Digestion

(b) Gas exchange

(c) Clearing inhaled dust in the trachea

(d) Blood circulation

Explanation: Cilia in the trachea move dust and foreign particles out of the respiratory tract.

4. What property of muscles allows contraction?

(a) Elasticity

(b) Excitability

(c) Contractility

(d) Extensibility

Explanation: Contractility enables muscles to shorten, producing force and movement.

5. Which type of muscle is involuntary and striated?

(a) Skeletal

(b) Visceral

(c) Cardiac

(d) Smooth

Explanation: Cardiac muscles are striated like skeletal muscles but involuntary, functioning in the heart.

6. What type of muscle is responsible for voluntary movements?

(a) Cardiac muscle

(b) Skeletal muscle

(c) Smooth muscle

(d) Visceral muscle

Explanation: Skeletal muscles are voluntary and striated, enabling controlled body movements like walking and lifting objects.

7. Which type of muscle does not show striations under a microscope?

(a) Skeletal

(b) Cardiac

(c) Smooth

(d) Myofibrils

Explanation: Smooth muscles are non-striated, involuntary muscles found in the walls of internal organs like the digestive tract.

8. What percentage of body weight in an adult human is contributed by muscles?

(a) 20-30%

(b) 40-50%

(c) 60-70%

(d) 10-20%

Explanation: Muscles make up 40-50% of an adult’s body weight and are vital for movement and posture.

9. What is the functional unit of a myofibril?

(a) Sarcolemma

(b) Sarcomere

(c) Z-line

(d) H-zone

Explanation: A sarcomere is the basic functional unit of muscle contraction, defined by the region between two Z-lines.

10. Which ion plays a crucial role in muscle contraction?

(a) Sodium (Na⁺)

(b) Potassium (K⁺)

(c) Calcium (Ca²⁺)

(d) Magnesium (Mg²⁺)

Explanation: Calcium ions bind to troponin, exposing active sites on actin filaments, enabling myosin to initiate contraction.

Biology MCQ, Class-12, Chapter-8, Microbes in Human Welfare

11. What is the main protein present in thin filaments of muscles?

(a) Myosin

(b) Actin

(c) Tropomyosin

(d) Troponin

Explanation: Thin filaments are primarily composed of actin, which interacts with myosin during muscle contraction.

12. What structure stores calcium ions in muscle fibers?

(a) Sarcolemma

(b) Sarcoplasmic reticulum

(c) Mitochondria

(d) Sarcoplasm

Explanation: The sarcoplasmic reticulum releases calcium ions during muscle contraction and reabsorbs them during relaxation.

13. Which protein has ATPase activity in muscle contraction?

(a) Actin

(b) Myosin

(c) Troponin

(d) Tropomyosin

Explanation: The myosin head acts as an ATPase enzyme, hydrolyzing ATP to provide energy for the cross-bridge cycle.

14. What is the role of troponin in muscle contraction?

(a) Stores calcium ions

(b) Masks active sites on actin

(c) Binds to ATP

(d) Generates action potential

Explanation: In the resting state, troponin blocks myosin-binding sites on actin, preventing unwanted contractions.

15. What type of joint is found between the humerus and pectoral girdle?

(a) Hinge joint

(b) Ball and socket joint

(c) Pivot joint

(d) Gliding joint

Explanation: Ball and socket joints allow multidirectional movement and rotation, such as in the shoulder.

16. Which pigment in muscles stores oxygen?

(a) Hemoglobin

(b) Myoglobin

(c) Melanin

(d) Keratin

Explanation: Myoglobin is a red pigment in muscles that binds oxygen, enabling aerobic respiration during prolonged activity.

17. What is the primary source of energy during prolonged muscle activity?

(a) Glucose

(b) Glycogen

(c) ATP from aerobic respiration

(d) Creatine phosphate

Explanation: During sustained activity, muscles rely on ATP generated by aerobic respiration using oxygen stored by myoglobin.

18. How many bones make up the human axial skeleton?

(a) 80

(b) 120

(c) 206

(d) 126

Explanation: The axial skeleton comprises 80 bones, including the skull, vertebral column, ribs, and sternum.

19. Which vertebra articulates with the skull?

(a) Axis

(b) Atlas

(c) Lumbar vertebra

(d) Sacrum

Explanation: The atlas, the first cervical vertebra, connects with the occipital condyles of the skull, enabling nodding movements.

20. What are the smallest bones in the human body?

(a) Phalanges

(b) Carpals

(c) Ear ossicles

(d) Tarsals

Explanation: The ear ossicles (malleus, incus, and stapes) are tiny bones in the middle ear involved in sound transmission.

21. What type of joint is found between the atlas and axis vertebrae?

(a) Hinge joint

(b) Pivot joint

(c) Saddle joint

(d) Ball and socket joint

22. Which type of rib is directly attached to the sternum?

(a) Floating ribs

(b) False ribs

(c) True ribs

(d) Vertebrochondral ribs

23. Which bone is known as the collar bone?

(a) Scapula

(b) Clavicle

(c) Sternum

(d) Humerus

24. What is the longest bone in the human body?

(a) Tibia

(b) Femur

(c) Humerus

(d) Radius

25. Which joint is characterized by the presence of a synovial cavity?

(a) Fibrous joint

(b) Cartilaginous joint

(c) Synovial joint

(d) Suture joint

26. How many cervical vertebrae are present in humans?

(a) 5

(b) 7

(c) 12

(d) 8

27. What is the function of the Z-line in a sarcomere?

(a) Anchors thin filaments

(b) Connects thick filaments

(c) Stores calcium

(d) Facilitates ATP production

28. Which pigment gives red muscle fibers their color?

(a) Hemoglobin

(b) Myoglobin

(c) Melanin

(d) Tropomyosin

29. What is the primary function of white muscle fibers?

(a) Rapid, short-term contraction

(b) Long-term endurance

(c) Oxygen storage

(d) Hormone regulation

30. What type of joint is present in the knee?

(a) Ball and socket

(b) Hinge

(c) Saddle

(d) Pivot

Download Complete PDF with 100+ MCQ (Each Chapter) & Explanation: