BIOLOGY MCQs (STS IBA JST Pattern
1. Removing part of plant causes plant death mainly due to:
A) Leaves
B) Stem
C) Roots
D) Flowers
Correct Answer: C) Roots
2. Basic component of all living things is:
A) Protein
B) Water
C) Fat
D) Minerals
Correct Answer: B) Water
3. Process of food preparation in plants is called:
A) Respiration
B) Photosynthesis
C) Digestion
D) Transpiration
Correct Answer: B) Photosynthesis
4. All living organisms consist of:
A) Organs
B) Tissues
C) Cells
D) Systems
Correct Answer: C) Cells
5. Which of the following is a root vegetable?
A) Potato
B) Carrot
C) Onion
D) Tomato
Correct Answer: B) Carrot
6. Leaves are green due to:
A) Xylem
B) Chlorophyll
C) Phloem
D) Stomata
Correct Answer: B) Chlorophyll
7. Teeth replaced by permanent teeth are:
A) Molar teeth
B) Incisors
C) Milk teeth
D) Wisdom teeth
Correct Answer: C) Milk teeth
8. Male reproductive cell is:
A) Egg
B) Ovum
C) Sperm
D) Zygote
Correct Answer: C) Sperm
9. Female reproductive cell is:
A) Sperm
B) Ovum
C) Pollen
D) Zygote
Correct Answer: B) Ovum
10. Bird active during night is:
A) Eagle
B) Owl
C) Crow
D) Sparrow
Correct Answer: B) Owl
11. Animal without external ears is:
A) Dog
B) Snake
C) Cat
D) Cow
Correct Answer: B) Snake
12. Tallest tree in the world is:
A) Pine
B) Redwood
C) Neem
D) Oak
Correct Answer: B) Redwood
13. Average life of a housefly is:
A) 1 day
B) 1 week
C) 1 month
D) 15–30 days
Correct Answer: D) 15–30 days
(Your answer 1 year was wrong)
14. Urine is formed in:
A) Liver
B) Heart
C) Kidneys
D) Lungs
Correct Answer: C) Kidneys
15. Herbivores are animals that:
A) Eat meat
B) Eat plants
C) Eat both
D) Eat insects
Correct Answer: B) Eat plants
16. Omnivores are animals that:
A) Eat plants only
B) Eat meat only
C) Eat both plants and animals
D) Eat grass
Correct Answer: C) Eat both plants and animals
17. Dogs are:
A) Herbivores
B) Carnivores
C) Omnivores
D) Insectivores
Correct Answer: C) Omnivores
(Your answer was correct)
18. Part of skeleton protecting brain:
A) Rib cage
B) Skull
C) Backbone
D) Femur
Correct Answer: B) Skull
19. Number of bones in shark body:
A) 0 (No bones, cartilage skeleton)
B) 50
C) 100
D) 200
Correct Answer: A) 0
20. Animal that never drinks water in life:
A) Camel
B) Kangaroo Rat
C) Goat
D) Cow
Correct Answer: B) Kangaroo Rat21. Physical basis of life is:
A) Cell
B) Protoplasm
C) Tissue
D) Organ
Correct Answer: B) Protoplasm
22. Largest cell in the world is:
A) Human ovum
B) Ostrich egg
C) Nerve cell
D) Bacteria
Correct Answer: B) Ostrich egg
23. Largest human cell is:
A) Nerve cell
B) Ovum
C) Muscle cell
D) Blood cell
Correct Answer: B) Ovum
24. Longest human cell is:
A) Muscle cell
B) Blood cell
C) Nerve cell
D) Skin cell
Correct Answer: C) Nerve cell
25. Number of muscles in human body:
A) 500
B) 639
C) 700
D) 450
Correct Answer: B) 639
26. Vertebrate with two chambered heart:
A) Frog
B) Fish
C) Snake
D) Bird
Correct Answer: B) Fish
27. Number of ribs in human body:
A) 20
B) 22
C) 24
D) 26
Correct Answer: C) 24
28. Hormones are produced by:
A) Nervous system
B) Endocrine glands
C) Digestive system
D) Muscles
Correct Answer: B) Endocrine glands
29. Normal blood sugar level is:
A) 40–60 mg/dL
B) 80–120 mg/dL
C) 150–200 mg/dL
D) 200–250 mg/dL
Correct Answer: B) 80–120 mg/dL
30. Normal blood pressure is:
A) 80/60
B) 100/60
C) 120/80
D) 150/100
Correct Answer: C) 120/80
(Your list had incorrect format)
31. Largest blood vessel in human body:
A) Vein
B) Aorta
C) Artery
D) Capillary
Correct Answer: B) Aorta
32. Vessel carrying impure blood from heart to lungs:
A) Aorta
B) Pulmonary artery
C) Pulmonary vein
D) Vena cava
Correct Answer: B) Pulmonary artery
33. Bronchitis is related to:
A) Heart
B) Lungs
C) Kidney
D) Liver
Correct Answer: B) Lungs
34. Tuberculosis is caused by:
A) Virus
B) Bacteria
C) Fungi
D) Parasite
Correct Answer: B) Bacteria
35. Dengue fever is spread by:
A) Housefly
B) Anopheles mosquito
C) Aedes mosquito (female)
D) Culex mosquito
Correct Answer: C) Aedes mosquito
36. Growing plants without soil is called:
A) Photosynthesis
B) Hydroponics
C) Germination
D) Transpiration
Correct Answer: B) Hydroponics
37. Baby blue whale drinks milk per day:
A) 50 liters
B) 100 liters
C) 190 liters
D) 300 liters
Correct Answer: C) 190 liters
38. Universal donor blood group:
A) A
B) B
C) O negative
D) AB
Correct Answer: C) O negative
(Your list wrote only O — corrected)
39. Average blood in human body:
A) 3 liters
B) 4 liters
C) 5–6 liters
D) 8 liters
Correct Answer: C) 5–6 liters
40. Facial muscles involved in speaking:
A) 30
B) 50
C) 70
D) 100
Correct Answer: C) 70
41. Number of taste buds in young person:
A) 10,000
B) 50,000
C) 100,000
D) 150,000
Correct Answer: C) 100,000
42. Human senses are:
A) 3
B) 4
C) 5
D) 6
Correct Answer: C) 5
43. Functions of ears:
A) Hearing only
B) Balance only
C) Hearing and balance
D) Smell
Correct Answer: C) Hearing and balance
44. Platelets help in:
A) Digestion
B) Breathing
C) Blood clotting
D) Oxygen transport
Correct Answer: C) Blood clotting
45. Instrument to detect ear disorder:
A) Stethoscope
B) Microscope
C) Auriscope
D) Thermometer
Correct Answer: C) Auriscope
46. Citrus fruits contain:
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Correct Answer: C) Vitamin C
47. Cover of air around Earth is:
A) Biosphere
B) Atmosphere
C) Hydrosphere
D) Lithosphere
Correct Answer: B) Atmosphere
48. Plants and animals maintain balance of:
A) Water
B) Soil
C) Gases
D) Sunlight
Correct Answer: C) Gases
49. Graveyard of RBCs:
A) Liver
B) Kidney
C) Spleen
D) Heart
Correct Answer: C) Spleen
50. Yellow color of urine is due to:
A) Urea
B) Uric acid
C) Urochrome
D) Ammonia
Correct Answer: C) Urochrome