Biology MCQs for 1st Year (Punjab Board)

This page has over 7,200 multiple-choice questions for Biology (1st Year (Punjab Board)), arranged in 12 chapters and 62 topics. The chapters include Biodiversity and Classification, Bacteria and Viruses, Cells and Subcellular Organelles, Biomolecules and Enzymes. Every question has four options, an instant answer and, where available, a short explanation.

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Chapters and topics

  • Biodiversity and Classification 8 topics · 1021 MCQs
  • Bacteria and Viruses 4 topics · 449 MCQs
  • Cells and Subcellular Organelles 9 topics · 944 MCQs
  • Biomolecules 6 topics · 838 MCQs
  • Enzymes 5 topics · 546 MCQs
  • Bioenergetics 4 topics · 508 MCQs
  • Structural and Computational Biology 2 topics · 200 MCQs
  • Plant Physiology 6 topics · 732 MCQs
  • Human Digestive System 4 topics · 433 MCQs
  • Human Respiratory System 3 topics · 314 MCQs
  • Human Circulatory System 6 topics · 641 MCQs
  • Human Skeletal and Muscular Systems 5 topics · 575 MCQs

Sample Biology MCQs

Try these questions, then open the full practice to work through every chapter. Tap “Show the answer” after you choose.

Q1. Candida albicans causes:

  1. ergot of rye
  2. smut of corn and wheat
  3. Dutch elm disease
  4. thrush (candidiasis)
Show the answer

Answer: D. thrush (candidiasis)

The correct answer is “thrush (candidiasis)”. Thrush (candidiasis): Candida albicans.

Q2. Colourful blooms in polluted water are caused by the rampant growth of:

  1. cyanobacteria
  2. mycoplasmas
  3. spirochaetes
  4. pseudomonads
Show the answer

Answer: A. cyanobacteria

The colours result from their photosynthetic pigments.

Q3. The disk-like compartments formed by the inner membranes of the chloroplast are the:

  1. cisternae
  2. cristae
  3. thylakoids
  4. lamellae of the Golgi
Show the answer

Answer: C. thylakoids

The correct answer is “thylakoids”. Stacks of thylakoids are called grana.

Q4. Which property of water makes water an excellent solvent for ionic and polar substances?

  1. hydrophobic exclusion
  2. high heat of vaporization
  3. high specific heat
  4. high polarity
Show the answer

Answer: D. high polarity

High polarity: makes water an excellent solvent for ionic and polar substances.

Q5. Haem in cytochromes is an example of a/an:

  1. prosthetic group
  2. coenzyme
  3. apoenzyme
  4. inorganic ion (activator)
Show the answer

Answer: A. prosthetic group

Activators are metal ions; prosthetic groups are tightly (covalently) bound organic cofactors; coenzymes are loosely bound organic cofactors, often from vitamins.

Q6. Which pigment is described as: “yellow accessory pigments absorbing in the blue region; carotenoids”?

  1. chlorophyll a
  2. xanthophylls
  3. P680
  4. chlorophyll b
Show the answer

Answer: B. xanthophylls

Xanthophylls: yellow accessory pigments absorbing in the blue region; carotenoids.

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