Biology Mock Test
Biology
Q. Where is blood purified in human body ?
A) Heart B) Lungs C) Kidney D) Liver
Ans: C) Kidney
Explanation: Kidneys filter waste, toxins, and excess water from blood, forming urine and maintaining chemical balance.
Q. Where is insulin produced ?
A) Liver B) Pancreas C) Lungs D) Kidney
Ans: B) Pancreas
Explanation: Beta cells in pancreas secrete insulin to regulate blood sugar by helping cells absorb glucose.
Q. Liquid part of blood ?
A) RBC B) WBC C) Plasma D) Platelet
Ans: C) Plasma
Explanation: Plasma is a yellowish liquid that transports nutrients, hormones, and waste products throughout the body.
Q. Largest organ in human body ?
A) Liver B) Skin C) Heart D) Lung
Ans: B) Skin
Explanation: Skin covers and protects the body, regulates temperature, and provides sensory perception.
Q. Disease due to vitamin D deficiency ?
A) Scurvy B) Rickets C) Anemia D) Beri-Beri
Ans: B) Rickets
Explanation: Lack of vitamin D reduces calcium absorption, causing weak, soft bones in children.
Q. Who discovered the blood bank ?
A) Karl Landsteiner B) Alexander Fleming C) Edward Jenner D) Louis Pasteur
Ans: A) Karl Landsteiner
Explanation: Landsteiner discovered blood groups, enabling safe blood storage and transfusion.
Q. Lifespan of RBC ?
A) 60 days B) 90 days C) 120 days D) 150 days
Ans: C) 120 days
Explanation: Red blood cells transport oxygen for ~120 days before being recycled in spleen/liver.
Q. Largest gland in human body ?
A) Pituitary B) Liver C) Pancreas D) Thyroid
Ans: B) Liver
Explanation: Liver produces bile, stores nutrients, detoxifies chemicals, and regulates metabolism.
Q. Part of ear that hears sound ?
A) Pinna B) Auditory Ossicles C) Cochlea D) Auditory Nerve
Ans: C) Cochlea
Explanation: Cochlea converts sound vibrations into electrical signals sent to the brain.
Q. Hardest substance in human body ?
A) Bone B) Enamel C) Nail D) Cartilage
Ans: B) Enamel
Explanation: Tooth enamel protects teeth from mechanical and chemical damage.
Q. Gas taken in during respiration?
A) Carbon dioxide B) Nitrogen C) Oxygen D) Hydrogen
Ans: C) Oxygen
Explanation: Oxygen is inhaled for cellular respiration to produce energy.
Q. Food transport in plants occurs via?
A) Xylem B) Phloem C) Cambium D) Root Hair
Ans: B) Phloem
Explanation: Phloem carries sugars from leaves to other parts of the plant.
Q. Malaria is spread by?
A) Female Anopheles mosquito B) Male mosquito C) Fly D) Lice
Ans: A) Female Anopheles mosquito
Explanation: Female Anopheles carry Plasmodium parasites, transmitting malaria via bites.
Q. Total bones in human body?
A) 202 B) 206 C) 210 D) 212
Ans: B) 206
Explanation: Adult humans have 206 bones forming the skeleton for support, protection, and movement.
Q. Vitamin produced by sunlight:
A) A B) B C) C D) D
Ans: D) Vitamin D
Explanation: UV rays in sunlight help skin synthesize vitamin D.
Q. Universal donor blood group:
A) A B) B C) AB D) O
Ans: D) O
Explanation: O negative blood lacks antigens, safe for all recipients.
Q. Organ that stores bile:
A) Liver B) Pancreas C) Gall bladder D) Kidney
Ans: C) Gall bladder
Explanation: Gall bladder stores and releases bile for digestion.
Q. Cell part with genetic material:
A) Cytoplasm B) Nucleus C) Ribosome D) Cell wall
Ans: B) Nucleus
Explanation: Nucleus contains DNA and regulates cell functions.
Q. Organ that digests fats:
A) Liver B) Kidney C) Lungs D) Heart
Ans: A) Liver
Explanation: Produces bile to emulsify fats for digestion.
Q. Gas filled in balloons:
A) Oxygen B) Hydrogen C) Helium D) CO₂
Ans: C) Helium
Explanation: Helium is lighter than air and non-flammable.
Q. Pneumonia affects:
A) Liver B) Lungs C) Brain D) Kidney
Ans: B) Lungs
Explanation: Pneumonia inflames alveoli, reducing oxygen exchange.
Q. Hardest substance in body:
A) Bone B) Enamel C) Cartilage D) Nail
Ans: B) Enamel
Explanation: Tooth enamel is the hardest biological tissue.
Q. Part that conducts food in plants:
A) Xylem B) Phloem C) Cambium D) Cortex
Ans: B) Phloem
Explanation: Phloem transports sugars from leaves to other parts.
Q. Colour of chlorophyll:
A) Red B) Yellow C) Green D) Blue
Ans: C) Green
Explanation: Chlorophyll reflects green light, giving leaves their color.
Q. Gas essential for respiration:
A) Oxygen B) Nitrogen C) CO₂ D) Argon
Ans: A) Oxygen
Explanation: Required for cellular respiration to release energy.
Q. Organ that purifies blood:
A) Heart B) Lungs C) Kidney D) Liver
Ans: C) Kidney
Explanation: Kidneys filter waste and maintain water balance.
Q. Disease from mosquito bite:
A) Cholera B) Malaria C) TB D) Typhoid
Ans: B) Malaria
Explanation: Caused by Plasmodium parasite via female Anopheles mosquitoes.
Q. Normal body temperature:
A) 96°F B) 98.6°F C) 100°F D) 97°F
Ans: B) 98.6°F
Explanation: Average human temperature is 37°C (98.6°F).
Q. Gas released in photosynthesis:
A) Oxygen B) CO₂ C) Nitrogen D) Hydrogen
Ans: A) Oxygen
Explanation: Plants release oxygen while producing food using sunlight.
Q. Vitamin for blood clotting:
A) A B) K C) B D) D
Ans: B) Vitamin K
Explanation: Vitamin K synthesizes clotting factors.
Q. Organ controlling body functions:
A) Heart B) Brain C) Liver D) Lungs
Ans: B) Brain
Explanation: Brain regulates all voluntary and involuntary activities.
Q. ‘Kitchen of the plant’:
A) Root B) Leaf C) Stem D) Flower
Ans: B) Leaf
Explanation: Leaves make food via photosynthesis.