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Biology MCQs

121 Questions Subject Test
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Cell BiologyHuman PhysiologyGeneticsEcology
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Which human organ is primarily responsible for filtering blood and producing urine?

  • A Liver
  • B Spleen
  • C Pancreas
  • D Kidney
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What is the term for a permanent change in the DNA sequence of an organism?

  • A Mutation
  • B Adaptation
  • C Variation
  • D Allele
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What is the term for the physical appearance or observable characteristics of an organism?

  • A Genome
  • B Genotype
  • C Karyotype
  • D Phenotype
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Which layer of skin contains sweat glands, hair follicles, and blood vessels?

  • A Epidermis
  • B Dermis
  • C Hypodermis
  • D Subcutis
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Which layer of the skin contains melanocytes that produce the pigment responsible for skin colour?

  • A Dermis
  • B Hypodermis
  • C Stratum corneum
  • D Epidermis
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Which disease is caused by the deficiency of Vitamin B1 affecting the nervous and cardiovascular systems?

  • A Beriberi
  • B Scurvy
  • C Pellagra
  • D Rickets
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What is the term for the region of a chromosome where sister chromatids join?

  • A Telomere
  • B Chromatid
  • C Centromere
  • D Nucleosome
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What is the process by which a caterpillar transforms into a butterfly called?

  • A Metamorphosis
  • B Germination
  • C Fertilization
  • D Pollination
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What is the term for the gradual process of change in the species composition of an ecosystem over time?

  • A Evolution
  • B Adaptation
  • C Migration
  • D Ecological succession
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What is the term for organisms that cannot make their own food and must consume other organisms?

  • A Autotrophs
  • B Heterotrophs
  • C Producers
  • D Chemotrophs
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What is the term for the pigment responsible for skin, hair, and eye color in humans?

  • A Hemoglobin
  • B Chlorophyll
  • C Keratin
  • D Melanin
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Which hormone regulates the body's metabolic rate?

  • A Insulin
  • B Thyroxine
  • C Adrenaline
  • D Estrogen
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What is the role of enzymes in biological reactions?

  • A Act as biological catalysts to speed up reactions
  • B Store genetic information
  • C Provide energy for reactions
  • D Transport oxygen in blood
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Which type of immunity is present from birth and provides a non-specific first line of defence?

  • A Acquired immunity
  • B Active immunity
  • C Passive immunity
  • D Innate immunity
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What is the term for the process of shedding an outer layer of skin, exoskeleton, or other covering?

  • A Metamorphosis
  • B Regeneration
  • C Hibernation
  • D Molting
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Which molecule is the primary energy currency of cells?

  • A ATP
  • B ADP
  • C NAD
  • D NADP
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Which part of the eye is the coloured ring that controls pupil size regulating light entry?

  • A Cornea
  • B Retina
  • C Iris
  • D Lens
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What is the term for the process by which plants lose water vapour through their leaves?

  • A Photosynthesis
  • B Osmosis
  • C Transpiration
  • D Respiration
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Which scientist developed the modern system of classification for organisms?

  • A Carl Linnaeus
  • B Charles Darwin
  • C Gregor Mendel
  • D Louis Pasteur
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Which gland is called the master gland of the endocrine system?

  • A Thyroid gland
  • B Pituitary gland
  • C Adrenal gland
  • D Pancreas
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