CSS - PMS - CCE - PCS - General Science
Organs
Which bone protects the brain?
A. Sternum
B. Skull
C. Pelvis
D. Femur
Correct Answer: B
The skull, especially the cranium, encloses and protects the brain.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ system provides structural support and protects internal organs?
A. Skeletal system
B. Endocrine system
C. Digestive system
D. Urinary system
Correct Answer: A
The skeletal system supports the body and protects organs such as the brain, heart and lungs.
CSS - PMS - CCE - PCS - General Science
Organs
Which tissue produces most blood cells in adults?
A. Bone marrow
B. Thyroid
C. Pancreas
D. Gallbladder
Correct Answer: A
Red bone marrow is the principal site of hematopoiesis in adults.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ is most important for T-cell development in children?
A. Thymus
B. Spleen
C. Liver
D. Pancreas
Correct Answer: A
The thymus provides an environment for T-cell maturation.
CSS - PMS - CCE - PCS - General Science
Organs
Which small lymphatic structures filter lymph fluid?
A. Lymph nodes
B. Nephrons
C. Alveoli
D. Villi
Correct Answer: A
Lymph nodes filter lymph and house immune cells.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ acts as a blood filter and is part of the lymphatic system?
A. Spleen
B. Pancreas
C. Gallbladder
D. Kidney
Correct Answer: A
The spleen is a lymphoid organ that filters blood and supports immune function.
CSS - PMS - CCE - PCS - General Science
Organs
Which pigment largely determines skin color and protects against ultraviolet radiation?
A. Hemoglobin
B. Melanin
C. Keratin
D. Bilirubin
Correct Answer: B
Melanin is produced by melanocytes and helps protect tissues from UV radiation.
CSS - PMS - CCE - PCS - General Science
Organs
Sweat glands help regulate body temperature mainly through which process?
A. Filtration
B. Evaporation
C. Digestion
D. Osmosis only
Correct Answer: B
Evaporation of sweat removes heat from the body surface.
CSS - PMS - CCE - PCS - General Science
Organs
Which is the outermost major layer of the skin?
A. Dermis
B. Epidermis
C. Hypodermis
D. Peritoneum
Correct Answer: B
The epidermis is the outer epithelial layer of skin.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ protects the body, helps regulate temperature and provides sensation?
A. Skin
B. Spleen
C. Pancreas
D. Thymus
Correct Answer: A
The skin acts as a barrier, assists thermoregulation and contains sensory receptors.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains taste buds?
A. Tongue
B. Larynx
C. Pharynx
D. Esophagus
Correct Answer: A
Taste buds are concentrated on papillae of the tongue, with additional sites in the oral cavity.
CSS - PMS - CCE - PCS - General Science
Organs
Which sensory organ detects odors?
A. Tongue
B. Nose
C. Ear
D. Skin
Correct Answer: B
Olfactory receptors in the nasal cavity detect odors.
CSS - PMS - CCE - PCS - General Science
Organs
Which membrane is commonly called the eardrum?
A. Tympanic membrane
B. Pleura
C. Peritoneum
D. Retina
Correct Answer: A
The tympanic membrane vibrates in response to sound waves.
CSS - PMS - CCE - PCS - General Science
Organs
Which inner ear structures are especially important for balance?
A. Semicircular canals
B. Cochlea only
C. Tympanic membrane
D. Auditory ossicles
Correct Answer: A
The semicircular canals detect rotational head movements and contribute to balance.
CSS - PMS - CCE - PCS - General Science
Organs
Which part of the inner ear is primarily responsible for hearing?
A. Cochlea
B. Semicircular canals
C. Eustachian tube
D. Pinna
Correct Answer: A
The cochlea converts sound vibrations into nerve impulses.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ is responsible for hearing and balance?
A. Eye
B. Ear
C. Nose
D. Tongue
Correct Answer: B
The inner ear contains structures for both hearing and equilibrium.
CSS - PMS - CCE - PCS - General Science
Organs
Which transparent structure focuses light onto the retina?
A. Lens
B. Sclera
C. Choroid
D. Optic disc
Correct Answer: A
The lens changes shape to focus light on the retina.
CSS - PMS - CCE - PCS - General Science
Organs
Which part of the eye contains photoreceptor cells?
A. Cornea
B. Retina
C. Lens
D. Iris
Correct Answer: B
The retina contains rods and cones, the photoreceptor cells.
CSS - PMS - CCE - PCS - General Science
Organs
Which part of the eye controls the amount of light entering?
A. Retina
B. Iris
C. Optic nerve
D. Sclera
Correct Answer: B
The iris adjusts pupil diameter and therefore regulates incoming light.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ is responsible for vision?
A. Ear
B. Eye
C. Nose
D. Tongue
Correct Answer: B
The eye receives and focuses light and converts it into neural signals for vision.