Science Olympiad : Advance Biology MCQ set - 6
Science Olympiad : Advance Biology MCQ practice with Answers set - 6
Q. How many chambers are there in the human heart ?
Ans: 4 chambers
Explanation: The heart has two atria and two ventricles.
Q. Which chamber pumps oxygenated blood to the body ?
Ans: Left ventricle
Explanation: It pumps oxygen-rich blood into the aorta.
Q. Which chamber receives deoxygenated blood ?
Ans: Right atrium
Explanation: It collects deoxygenated blood from the body.
Q. Which is the largest artery in the human body ?
Ans: Aorta
Explanation: The aorta distributes oxygenated blood to the entire body.
Q. Which blood cells transport oxygen ?
Ans: Red Blood Cells (RBCs)
Explanation: RBCs carry oxygen through hemoglobin.
Q. Which protein in RBC carries oxygen ?
Ans: Hemoglobin
Explanation: Hemoglobin binds oxygen molecules in the lungs.
Q. Which type of blood cells fight infections ?
Ans: White Blood Cells (WBCs)
Explanation: WBCs destroy pathogens and protect immunity.
Q. Average blood volume in an adult human ?
Ans: 5–6 liters
Explanation: An adult has approximately 7–8% of body weight as blood.
Q. Universal donor blood group ?
Ans: O negative (O⁻)
Explanation: O⁻ blood can be given to all groups.
Q. Universal recipient blood group ?
Ans: AB positive (AB⁺)
Explanation: AB⁺ can receive blood from all groups.
Q. Which organ produces insulin ?
Ans: Pancreas
Explanation: Pancreatic β-cells secrete insulin.
Q. Which hormone regulates blood sugar ?
Ans: Insulin
Explanation: Insulin lowers blood glucose levels.
Q. Which hormone is called the ‘fight or flight’ hormone ?
Ans: Adrenaline
Explanation: It prepares the body for emergency action.
Q. Which gland is called the ‘master gland’?
Ans: Pituitary gland
Explanation: It controls other endocrine glands.
Q. Which gland regulates metabolism ?
Ans: Thyroid gland
Explanation: Thyroid hormones regulate body metabolism.
Q. Which gland secretes melatonin ?
Ans: Pineal gland
Explanation: Melatonin controls sleep–wake cycles.
Q. Which gland controls calcium level in blood ?
Ans: Parathyroid gland
Explanation: It releases PTH, which increases blood calcium.
Q. Which part of the brain controls breathing & heartbeat ?
Ans: Medulla oblongata
Explanation: It regulates vital involuntary functions.
Q. Which part of the brain controls posture & balance ?
Ans: Cerebellum
Explanation: It coordinates muscle movement and balance.
Q. Largest part of the human brain ?
Ans: Cerebrum
Explanation: It controls thinking, memory, vision, and intelligence.
Q. Functional unit of the nervous system ?
Ans: Neuron
Explanation: Neurons transmit nerve impulses throughout the body.
Q. Which part of neuron receives signals ?
Ans: Dendrites
Explanation: Dendrites receive impulses from other neurons.
Q. Which part of neuron sends signals ?
Ans: Axon
Explanation: Axons carry impulses away from the neuron body.
Q. Which fluid cushions the brain and spinal cord ?
Ans: Cerebrospinal fluid (CSF)
Explanation: CSF protects the CNS from shock and nourishes it.
Q. Which membrane surrounds and protects brain & spinal cord ?
Ans: Meninges
Explanation: The meninges (dura, arachnoid, pia mater) form protective layers.