Science Olympiad : General Biology MCQ set - 11
Q. Which tissue connects muscles to bones ?
Ans: Tendons
Explanation: Tendons are tough, fibrous tissues that attach muscles to bones and help in movement.
Q. Which tissue connects bones to bones ?
Ans: Ligaments
Explanation: Ligaments are elastic tissues that hold bones together at joints, providing stability.
Q. Which tissue carries water in plants ?
Ans: Xylem
Explanation: Xylem transports water and minerals from roots to all parts of the plant.
Q. Which tissue carries food in plants ?
Ans: Phloem
Explanation: Phloem transports prepared food (glucose) from leaves to other parts of the plant.
Q. Which plant stores food in its roots ?
Ans: Carrot
Explanation: Carrot roots act as storage organs, storing carbohydrates for the plant.
Q. Which part of the brain controls balance ?
Ans: Cerebellum
Explanation: The cerebellum coordinates body balance, posture, and motor activities.
Q. Which part of the brain controls thinking ?
Ans: Cerebrum
Explanation: The cerebrum handles intelligence, memory, reasoning, and voluntary actions.
Q. Which part of the brain controls heartbeat and breathing ?
Ans: Medulla oblongata
Explanation: It regulates involuntary activities like heartbeat, breathing, and swallowing.
Q. Which organ purifies blood in humans ?
Ans: Kidneys
Explanation: Kidneys filter waste products and excess water from blood to form urine.
Q. Which organ removes carbon dioxide from the body ?
Ans: Lungs
Explanation: Lungs expel carbon dioxide during exhalation through the respiratory system.
Q. Which part of the plant absorbs water ?
Ans: Roots
Explanation: Root hairs absorb water and minerals from the soil.
Q. Which vitamin helps in blood clotting ?
Ans: Vitamin K
Explanation: Vitamin K is essential for producing clotting factors in the blood.
Q. Which vitamin helps in calcium absorption ?
Ans: Vitamin D
Explanation: Vitamin D increases calcium absorption in the intestines, strengthening bones.
Q. Which vitamin prevents night blindness ?
Ans: Vitamin A
Explanation: Vitamin A supports vision in dim light by maintaining the pigment rhodopsin.
Q. Which blood group is called universal donor ?
Ans: O Negative (O–)
Explanation: O– blood can be given to all groups because it lacks A, B, and Rh antigens.
Q. Which blood group is called universal recipient ?
Ans: AB Positive (AB+)
Explanation: AB+ can receive blood from all groups because it has all antigens.
Q. Which is the smallest bone in the human body ?
Ans: Stapes
Explanation: The stapes bone in the middle ear is the tiniest, helping transmit sound vibrations.
Q. Which is the largest bone in the human body ?
Ans: Femur
Explanation: The femur, or thigh bone, is the longest and strongest bone in the body.
Q. Which is the largest gland in the human body ?
Ans: Liver
Explanation: The liver is the largest gland, responsible for detoxification and bile production.
Q. Which is the longest cell in the human body ?
Answer: Neuron
Explanation: Nerve cells are long and can reach over a meter in length to carry impulses.
Q. Which part of the eye controls light entry ?
Ans: Pupil
Explanation: The pupil widens or narrows to regulate how much light enters the eye.
Q. Which part of the eye is sensitive to light ?
Ans: Retina
Explanation: The retina contains rods and cones that detect light and color.
Q. Which lens is used to correct myopia (short-sightedness) ?
Ans: Concave lens
Explanation: Concave lenses diverge light rays so distant objects come into focus.
Q. Which lens is used to correct hypermetropia (long-sightedness) ?
Ans: Convex lens
Explanation: Convex lenses converge light rays so nearby objects can be seen clearly.
Q. Which organ controls body temperature ?
Ans: Hypothalamus
Explanation: The hypothalamus acts as the body’s thermostat, maintaining stable temperature.