Doon Defence Dreamers – Important Biology MCQs for NDA/CDS/AFCAT
Q1. Golden rice, a genetically-modified crop, has genes for the biosynthesis of?
a) Omega-3 fatty acids
b) Vitamin A
c) Vitamin B
d) Vitamin C
Answer: b) Vitamin A
Golden rice is rich in β-carotene (precursor of Vitamin A).
Q2. Which statement is NOT correct about microbes?
a) Used in sewage treatment plants
b) Used in beverage production in fermenters
c) No antibiotic has been obtained from microbes
d) Used to obtain bioactive molecules
Answer: c) No antibiotic has been obtained from microbes
Antibiotics like penicillin are obtained from microbes.
Q3. Melanin pigment protects humans against?
a) UV radiation
b) Infrared radiation
c) X-rays
d) Short-wave radio radiation
Answer: a) Ultraviolet radiation
Q4. Muscles are connected to bones by tendons made of?
a) Fibrin
b) Collagen
c) Elastin
d) Cellulose
Answer: b) Collagen
Collagen is the main fibrous protein in tendons.
Q5. Which vitamin plays a role in blood clotting?
a) Vitamin A
b) Vitamin D
c) Vitamin E
d) Vitamin K
Answer: d) Vitamin K
Q6. The term “Probiotic” refers to?
a) Organic food
b) Antacid
c) Antibiotic
d) Live microbial food supplement
Answer: d) Live microbial food supplement
Q7. Which microbe curdles milk?
a) Lactic acid bacillus
b) Clostridium botulinum
c) Vibrio cholerae
d) Saccharomyces cerevisiae
Answer: a) Lactic acid bacillus
Q8. Patients with Gouty Arthritis should reduce intake of?
a) Food fibres
b) Nucleic acids
c) Lipids
d) Carbohydrates
Answer: b) Nucleic acids
High nucleic acid foods increase uric acid.
Q9. Causal organism of Elephantiasis is?
a) Ascaris lumbricoides
b) Culex pipiens
c) Wuchereria bancrofti
d) Fasciola hepatica
Answer: c) Wuchereria bancrofti
Q10. Who shared the 1962 Nobel Prize with Watson & Crick?
a) Erwin Chargaff
b) Maurice Wilkins
c) Rosalind Franklin
d) Phoebus Levene
Answer: b) Maurice Wilkins
Q11. Which one is NOT a true fruit?
a) Apple
b) Date
c) Grape
d) Plum
Answer: d) Plum
Q12. Least infectious disease is?
a) Leprosy
b) Hepatitis
c) Tuberculosis
d) Conjunctivitis
Answer: a) Leprosy
Q13. Which of the following is NOT mosquito-borne?
a) Dengue fever
b) Malaria
c) Sleeping sickness
d) Filariasis
Answer: c) Sleeping sickness
Caused by tsetse fly.
Q14. Apart from C, H, O, N, amino acids also contain?
a) Phosphorus
b) Zinc
c) Calcium
d) Sulphur
Answer: d) Sulphur
Q15. Which element is vital for nerve impulse conduction?
a) Calcium
b) Iron
c) Sodium
d) Zinc
Answer: a) Calcium
Q16. Which vitamin is easily destroyed during cooking & storage?
a) Vitamin A
b) Vitamin B6
c) Vitamin C
d) Vitamin K
Answer: c) Vitamin C
Q17. The compound used in anti-malarial drug is?
a) Aspirin
b) Neoprene
c) Isoprene
d) Chloroquine
Answer: d) Chloroquine
Q18. Pellagra is a disease of?
a) Blood (Anaemia)
b) Skin
c) Bones (Osteomalacia)
d) Rickets
Answer: b) Skin
Q19. Richest source of Vitamin D is?
a) Cod liver oil
b) Spinach
c) Milk
d) Cheese
Answer: a) Cod liver oil
Q20. Which test confirms cancer?
a) X-ray
b) Urine test
c) Blood test
d) Biopsy
Answer: d) Biopsy
