NEET (UG)

Practice Test 1 — Locomotion and Movement

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

Pseudopodia are used for movement by:

Solution: Leucocytes and macrophages show amoeboid movement using pseudopodia.

Question 2

Which muscle does NOT fatigue and is found only in the heart?

Solution: Cardiac muscle (striated, involuntary) does not fatigue.

Question 3

The dark band of a sarcomere containing myosin is the:

Solution: The A band (anisotropic) contains the thick myosin filaments.

Question 4

According to the sliding-filament theory, during contraction:

Solution: Thin actin filaments slide over thick myosin filaments; A band is unchanged.

Question 5

Calcium for muscle contraction is released from the:

Solution: Ca²⁺ is released from the sarcoplasmic reticulum and binds troponin.

Question 6

The longest bone in the human body is the:

Solution: The femur (thigh bone) is the longest bone.

Question 7

The number of bones in the human skull is:

Solution: The skull has 22 bones (8 cranial + 14 facial).

Question 8

Osteoporosis is most directly linked to a decrease in:

Solution: Reduced oestrogen (e.g. after menopause) lowers bone mass — osteoporosis.

Section B — Assertion & Reason

Question 9

A: During muscle contraction the A band remains the same length.
R: The thick myosin filaments do not shorten; only the overlap with actin increases.

Solution: The A band = myosin length, which is unchanged — R explains A.

Question 10

A: Calcium ions are required to start muscle contraction.
R: Ca²⁺ binds troponin and moves tropomyosin to expose the actin binding sites.

Solution: Ca²⁺ exposing actin sites is exactly why it is required — R explains A.

Question 11

A: Cardiac muscle is voluntary like skeletal muscle.
R: Cardiac muscle shows striations under the microscope.

Solution: A is false — cardiac muscle is involuntary; R is true (it is striated).

Question 12

A: The joints between the vertebrae allow only limited movement.
R: They are cartilaginous joints, not freely movable synovial joints.

Solution: Cartilaginous joints permit only slight movement — R explains A.