100 General Science MCQs: Environmental Science:
26. What is the largest source of greenhouse gas emissions?
a) Agriculture
b) Transportation
c) Industry
d) Energy production
27. Which layer of the Earth’s atmosphere contains the ozone layer?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
28. What is the term for the gradual increase in Earth’s average temperature?
a) Global warming
b) Ozone depletion
c) Acid rain
d) Deforestation
29. What is the process by which plants release water vapor into the atmosphere?
a) Precipitation
b) Condensation
c) Transpiration
d) Evaporation
30. What is the term for the variety of life on Earth, including the diversity of species and ecosystems?
a) Sustainability
b) Biodiversity
c) Conservation
   d) Ecology
100 General Science MCQs: Genetics:
31. Which genetic disorder is characterized by an extra chromosome 21?
a) Down syndrome
b) Turner syndrome
c) Hemophilia
d) Klinefelter syndrome
32. In a Punnett square, what do capital letters represent?
a) Recessive alleles
b) Dominant alleles
c) Genes for males
d) Mutations
33. What is the likelihood that a heterozygous individual will pass on a recessive allele to their offspring?
a) 0%
b) 25%
c) 50%
d) 75%
34. What term describes the genetic makeup of an organism?
a) Phenotype
b) Genotype
c) Allele
d) Hybrid
35. What is the study of the inheritance of traits and variation in populations?
a) Anatomy
b) Physiology
c) Evolution
d) Genetics
100 General Science MCQs: Microbiology:
36. Which microorganism causes tuberculosis?
a) Bacteria
b) Virus
c) Fungus
d) Protozoa
37. What is the process of heating liquids to kill harmful microorganisms?
a) Fermentation
b) Pasteurization
c) Sterilization
d) Filtration
38. Which microorganism is responsible for causing yeast infections?
a) Bacteria
b) Virus
c) Fungus
d) Protozoa
39. What is the smallest infectious agent?
a) Bacteria
b) Virus
c) Fungus
d) Protozoa
40. What is the study of viruses called?
a) Bacteriology
b) Virology
c) Mycology
d) Parasitology
100 General Science MCQs: Ecology:
41. What term describes a relationship between two organisms where one benefits and the other is harmed?
a) Mutualism
b) Parasitism
c) Commensalism
d) Competition
42. What is the ultimate source of energy for most ecosystems?
a) Water
b) Wind
c) Sunlight
d) Soil
43. Which biome is characterized by extremely cold temperatures and little vegetation?
a) Desert
b) Tropical rainforest
c) Tundra
d) Grassland
44. What is the process of converting atmospheric nitrogen into forms that plants can use?
a) Photosynthesis
b) Nitrogen fixation
c) Cellular respiration
d) Denitrification
45. What is the term for the gradual change in species composition of a community over time?
a) Succession
b) Migration
c) Adaptation
d) Evolution
100 General Science MCQs: Anatomy and Physiology:
46. Which organ pumps blood throughout the circulatory system?
a) Lungs
b) Liver
c) Heart
d) Kidneys
47. What is the role of the pancreas in the human body?
a) Producing insulin
b) Filtering blood
c) Digesting food
d) Producing bile
48. What is the largest organ in the human body?
a) Heart
b) Brain
c) Skin
d) Liver
49. Which system is responsible for protecting the body from pathogens?
a) Digestive system
b) Nervous system
c) Immune system
d) Endocrine system
50. Which part of the brain is responsible for coordinating muscle movements and balance?
a) Cerebrum
b) Cerebellum
c) Medulla oblongata
   d) Hypothalamus
A molecular biologist and aspiring bioinformatician with a passion for genomics, rare diseases, and precision medicine. With an MPhil in Molecular Biology and experience in genetics and genomics, he has contributed to clinical research projects on rare genetic disorders. He’s passionate about making genomic data meaningful — and ultimately helpful — for patients and clinicians alike.
