181. Choose the correct biology answer: which part of the eye controls the amount of light entering?
✅ A. Iris
a: Iris | b: Cornea only | c: Retina | d: Optic nerve Read more
Biology MCQs – Page 10
182. Choose the correct biology answer: what is the largest organ of the human body?
✅ C. Skin
a: Liver | b: Brain | c: Skin | d: Lung Read more
183. Choose the correct biology answer: which structure controls what enters and leaves a cell?
✅ A. Cell membrane
a: Cell membrane | b: Chromosome | c: Cell wall only | d: Nucleolus Read more
184. Choose the correct biology answer: which molecule is the main immediate energy currency of cells?
✅ B. ATP
a: Starch | b: ATP | c: DNA | d: RNA Read more
185. Choose the correct biology answer: which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Decomposers only | b: Predators | c: Producers | d: Primary consumers Read more
186. Choose the correct biology answer: what is the study of insects called?
✅ A. Entomology
a: Entomology | b: Herpetology | c: Botany | d: Mycology Read more
187. Choose the correct biology answer: what is the study of fungi called?
✅ A. Mycology
a: Mycology | b: Entomology | c: Ecology | d: Ornithology Read more
188. Choose the correct biology answer: which part of the brain helps coordinate balance and movement?
✅ D. Cerebellum
a: Pituitary gland | b: Medulla only | c: Hypothalamus | d: Cerebellum Read more
189. Choose the correct biology answer: which biological process produces two genetically similar daughter cells for growth?
✅ D. Mitosis
a: Fertilization | b: Meiosis | c: Transcription | d: Mitosis Read more
190. Choose the correct biology answer: which organ produces insulin?
✅ A. Pancreas
a: Pancreas | b: Thyroid | c: Gallbladder | d: Spleen Read more
191. Choose the correct biology answer: which vitamin is essential for normal blood clotting?
✅ B. Vitamin K
a: Vitamin C | b: Vitamin K | c: Vitamin B1 | d: Vitamin D Read more
192. Choose the correct biology answer: which cells help defend the body against infection?
✅ C. White blood cells
a: Red blood cells | b: Platelets | c: White blood cells | d: Adipocytes Read more
193. Choose the correct biology answer: which organ is primarily responsible for gas exchange in humans?
✅ A. Lungs
a: Lungs | b: Gallbladder | c: Spleen | d: Heart Read more
194. Choose the correct biology answer: which pigment gives many plants their green colour?
✅ B. Chlorophyll
a: Haemoglobin | b: Chlorophyll | c: Keratin | d: Melanin Read more
195. Choose the correct biology answer: which part of a plant absorbs most water from soil?
✅ C. Roots
a: Flowers | b: Fruits | c: Roots | d: Leaves only Read more
196. Choose the correct biology answer: which organ filters blood to produce urine?
✅ A. Kidney
a: Kidney | b: Lung | c: Pancreas | d: Stomach Read more
197. Choose the correct biology answer: which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ B. O negative
a: B negative | b: O negative | c: AB positive | d: A positive Read more
198. Choose the correct biology answer: which molecule carries hereditary information in most organisms?
✅ A. DNA
a: DNA | b: Glucose | c: ATP | d: Cellulose Read more
199. Choose the correct biology answer: what is the basic structural and functional unit of life?
✅ B. Cell
a: Organ system | b: Cell | c: Tissue | d: Organ Read more
200. Choose the correct biology answer: which organelle is often called the powerhouse of the cell?
✅ B. Mitochondrion
a: Golgi apparatus | b: Mitochondrion | c: Ribosome | d: Lysosome Read more