Important Biology Questions for NDA/CDS/AFCAT
Q1. Which one of the following is an enzyme?
a) Glucagon
b) Insulin
c) Somatotropin
d) Trypsin
Answer: d) Trypsin
Trypsin is a digestive enzyme that breaks down proteins.
Q2. Which vitamin is provided by sunlight to the body?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: d) Vitamin D
Sunlight helps synthesize Vitamin D in the skin.
Q3. Deficiency of which element leads to dental caries?
a) Iron
b) Copper
c) Fluorine
d) Zinc
Answer: c) Fluorine
Lack of fluorine causes weak teeth and cavities.
Q4. Healing of wounds is hastened by which vitamin?
a) Vitamin A
b) Vitamin E
c) Vitamin C
d) Vitamin K
Answer: c) Vitamin C
Vitamin C helps in collagen formation and wound healing.
Q5. Which disease is caused by a mad dog’s bite?
a) Hydrocele
b) Hydrophobia
c) Hydroperitoneum
d) Hydrocephalus
Answer: b) Hydrophobia (Rabies)
Rabies virus causes hydrophobia after dog bites.
Q6. Which vegetable protein is equal to animal protein?
a) Soybean protein
b) Wheat protein
c) Corn protein
d) Bengal gram protein
Answer: a) Soybean protein
Soy protein is closest to animal protein in quality.
Q7. Carotene in Indian cow’s milk causes:
a) Creamish white color
b) Yellow color
c) Deep yellow color
d) No change
Answer: b) Yellow color
Beta-carotene gives Indian cow’s milk a yellow tint.
Q8. A woman weighing 45 kg doing heavy physical work needs:
a) 2500 calories/day
b) 3000 calories/day
c) 2800 calories/day
d) 3700 calories/day
Answer: b) 3000 calories/day
Energy requirement increases with physical activity.
Q9. Foot and mouth disease is found in:
a) Cats and dogs
b) Cattle
c) Poultry
d) Humans
Answer: b) Cattle
It’s a viral disease affecting cloven-hoofed animals.
Q10. Which one of the following is a primate?
a) Bear
b) Otter
c) Loris
d) Pangolin
Answer: c) Loris
Loris is a small nocturnal primate.
Q11. Mushrooms belong to which group?
a) Ferns
b) Algae
c) Fungi
d) Lichens
Answer: c) Fungi
Mushrooms are edible fungi.
Q12. Food wrapped in newspapers may get contaminated by:
a) Lead
b) Iron
c) Aluminum
d) Magnesium
Answer: a) Lead
Printing ink contains lead, harmful if ingested.
Q13. Which produces no flowers but only seeds?
a) Coffee
b) Cashew nut
c) Groundnut
d) Pine
Answer: d) Pine
Pine is a gymnosperm—no flowers, only naked seeds.
Q14. Which plant is used for green manuring in India?
a) Wheat
b) Sunhemp
c) Cotton
d) Rice
Answer: b) Sunhemp
Sunhemp enriches soil fertility when ploughed in.
Q15. Food that provides protein closest to meat is:
a) Butter & bread
b) Groundnuts, dal & wheat
c) Sprouted gram & groundnuts
d) Groundnuts & jaggery
Answer: c) Sprouted gram & groundnuts
High in quality plant proteins.
Q16. Which disease is inheritable?
a) Leukemia
b) Colour blindness
c) Malignancy
d) Hepatitis
Answer: b) Colour blindness
A genetic disorder linked with X-chromosome.
Q17. Which elements are present in all proteins?
Carbon
Hydrogen
Oxygen
Nitrogen
a) 2 & 3
b) 1, 2 & 4
c) 1, 3 & 4
d) 1, 2, 3 & 4
Answer: d) 1,2,3 & 4
Proteins are made of C, H, O, and N atoms.
Q18. For which disease is no vaccine yet available?
a) Tetanus
b) Malaria
c) Measles
d) Mumps
Answer: b) Malaria
No effective vaccine, prevention is via control of mosquitoes.
Q19. Which vitamin is synthesized in the body by intestinal bacteria?
a) Vitamin B1
b) Vitamin B4
c) Vitamin D
d) Vitamin K
Answer: d) Vitamin K
Gut bacteria produce Vitamin K, essential for blood clotting.
Q20. BCG vaccine is given for immunity against:
a) Polio
b) Cholera
c) Smallpox
d) Tuberculosis
Answer: d) Tuberculosis
BCG (Bacillus Calmette-Guérin) protects against TB.
