Q81. What is the primary function of the esophagus in the digestive system?
A) To digest food
B) To absorb nutrients
C) To transport food to the stomach
D) To produce digestive enzymes
Show Answer
Correct Answer: C) To transport food to the stomach
Explanation: The esophagus is a muscular tube that connects the throat (pharynx) with the stomach. Its main function is to transport food and liquids from the mouth to the stomach for digestion.
Q82. Which part of the human body is responsible for the sense of hearing?
A) Skin
B) Eyes
C) Nose
D) Ears
Show Answer
Correct Answer: D) Ears
Explanation: The ears are responsible for the sense of hearing. Sound waves enter the ear canal and cause the eardrum and ossicles in the middle ear to vibrate, transmitting the sound to the inner ear where it is converted into nerve impulses.
Q83. What is the main function of the corpus callosum in the brain?
A) To regulate emotions
B) To control voluntary movements
C) To connect the two hemispheres of the brain
D) To process sensory information
Show Answer
Correct Answer: C) To connect the two hemispheres of the brain
Explanation: The corpus callosum is a wide, flat bundle of neural fibers beneath the cortex that connects the left and right cerebral hemispheres, enabling communication between them.
Q84. Which vitamin is important for the health of bones and teeth?
A) Vitamin A
B) Vitamin B12
C) Vitamin C
D) Vitamin D
Show Answer
Correct Answer: D) Vitamin D
Explanation: Vitamin D is important for the health of bones and teeth as it promotes calcium absorption and maintains adequate serum calcium and phosphate concentrations to enable normal mineralization of bone.
Q85. What is the primary function of the atria in the human heart?
A) To pump blood out of the heart
B) To receive blood returning to the heart
C) To store blood
D) To oxygenate blood
Show Answer
Correct Answer: B) To receive blood returning to the heart
Explanation: The atria are the two upper chambers of the heart. Their main function is to receive blood as it returns to the heart from the body (right atrium) and the lungs (left atrium).
Q86. Which part of the human body is responsible for the sense of taste?
A) Skin
B) Nose
C) Eyes
D) Tongue
Show Answer
Correct Answer: D) Tongue
Explanation: The tongue is responsible for the sense of taste. It contains taste buds that detect sweet, sour, salty, bitter, and umami flavors.
Q87. What is the function of the villi in the small intestine?
A) To produce digestive enzymes
B) To absorb nutrients
C) To move food through the intestine
D) To secrete hormones
Show Answer
Correct Answer: B) To absorb nutrients
Explanation: The villi are small, finger-like projections that line the small intestine and increase its surface area to maximize nutrient absorption.
Q88. Which hormone is produced by the ovaries and regulates the menstrual cycle?
A) Testosterone
B) Progesterone
C) Insulin
D) Adrenaline
Show Answer
Correct Answer: B) Progesterone
Explanation: Progesterone, produced by the ovaries, is a hormone that regulates the menstrual cycle and is important for maintaining pregnancy.
Q89. What is the primary function of the optic nerve in the human body?
A) To control eye movement
B) To regulate pupil size
C) To transmit visual information to the brain
D) To protect the eye
Show Answer
Correct Answer: C) To transmit visual information to the brain
Explanation: The optic nerve carries visual information from the retina to the brain, where it is processed to form images.
Q90. Which part of the human body is responsible for the sense of balance?
A) Ears
B) Eyes
C) Skin
D) Nose
Show Answer
Correct Answer: A) Ears
Explanation: The ears, specifically the vestibular system within the inner ear, are responsible for the sense of balance. The semicircular canals and otolith organs detect head movements and gravity, helping to maintain balance and spatial orientation.