581. In basic biology, which part of the eye controls the amount of light entering?
✅ D. Iris
a: Cornea only | b: Optic nerve | c: Retina | d: Iris Read more
Biology MCQs – Page 30
582. In basic biology, what is the largest organ of the human body?
✅ C. Skin
a: Lung | b: Liver | c: Skin | d: Brain Read more
583. In basic biology, which structure controls what enters and leaves a cell?
✅ A. Cell membrane
a: Cell membrane | b: Cell wall only | c: Nucleolus | d: Chromosome Read more
584. In basic biology, which molecule is the main immediate energy currency of cells?
✅ D. ATP
a: DNA | b: RNA | c: Starch | d: ATP Read more
585. In basic biology, what is the study of insects called?
✅ A. Entomology
a: Entomology | b: Botany | c: Mycology | d: Herpetology Read more
586. In basic biology, which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Primary consumers | b: Predators | c: Producers | d: Decomposers only Read more
587. In basic biology, what is the study of fungi called?
✅ B. Mycology
a: Entomology | b: Mycology | c: Ecology | d: Ornithology Read more
588. In basic biology, which part of the brain helps coordinate balance and movement?
✅ B. Cerebellum
a: Medulla only | b: Cerebellum | c: Hypothalamus | d: Pituitary gland Read more
589. In basic biology, which organ produces insulin?
✅ B. Pancreas
a: Gallbladder | b: Pancreas | c: Thyroid | d: Spleen Read more
590. In basic biology, which biological process produces two genetically similar daughter cells for growth?
✅ D. Mitosis
a: Meiosis | b: Fertilization | c: Transcription | d: Mitosis Read more
591. In basic biology, which cells help defend the body against infection?
✅ D. White blood cells
a: Adipocytes | b: Platelets | c: Red blood cells | d: White blood cells Read more
592. In basic biology, which vitamin is essential for normal blood clotting?
✅ C. Vitamin K
a: Vitamin C | b: Vitamin B1 | c: Vitamin K | d: Vitamin D Read more
593. In basic biology, which organ is primarily responsible for gas exchange in humans?
✅ B. Lungs
a: Spleen | b: Lungs | c: Gallbladder | d: Heart Read more
594. In basic biology, which part of a plant absorbs most water from soil?
✅ C. Roots
a: Flowers | b: Fruits | c: Roots | d: Leaves only Read more
595. In basic biology, which organ filters blood to produce urine?
✅ C. Kidney
a: Stomach | b: Pancreas | c: Kidney | d: Lung Read more
596. In basic biology, which pigment gives many plants their green colour?
✅ A. Chlorophyll
a: Chlorophyll | b: Melanin | c: Haemoglobin | d: Keratin Read more
597. In basic biology, which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ A. O negative
a: O negative | b: B negative | c: A positive | d: AB positive Read more
598. In basic biology, which molecule carries hereditary information in most organisms?
✅ D. DNA
a: Cellulose | b: Glucose | c: ATP | d: DNA Read more
599. In basic biology, which organelle is often called the powerhouse of the cell?
✅ C. Mitochondrion
a: Lysosome | b: Golgi apparatus | c: Mitochondrion | d: Ribosome Read more
600. Which gas is released by plants during photosynthesis?
✅ C. Oxygen
a: Carbon monoxide | b: Methane | c: Oxygen | d: Ammonia Read more