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Biology MCQs

56 Questions Subject Test
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Build a clear understanding of living organisms, cells, genetics, human systems and the environment through carefully selected practice questions.

Cell BiologyHuman PhysiologyGeneticsEcology
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41
Easy nts Uploaded: 06 Aug 2026

What term describes two different species living together where both benefit?

  • A Parasitism
  • B Commensalism
  • C Predation
  • D Mutualism
Permalink
Correct Answer: Option D — Mutualism
Explanation: Mutualism is a symbiotic relationship where both interacting species gain benefits. A classic example is bees pollinating flowers while collecting nectar, benefiting both the plant's reproduction and the bee's food supply simultaneously.
Submitted by: PaperMCQs
42
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which scientist proposed the theory of evolution by natural selection?

  • A Gregor Mendel
  • B Louis Pasteur
  • C Charles Darwin
  • D Aristotle
Permalink
Correct Answer: Option C — Charles Darwin
Explanation: Charles Darwin proposed the theory of evolution by natural selection in his 1859 book On the Origin of Species explaining how species change over generations through differential reproduction.
Submitted by: PaperMCQs
43
Easy css Uploaded: 06 Aug 2026

Which plant hormone is primarily responsible for stem elongation and phototropism?

  • A Cytokinin
  • B Gibberellin
  • C Ethylene
  • D Auxin
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Correct Answer: Option D — Auxin
Explanation: Auxin is a plant hormone that regulates growth by promoting cell elongation, particularly in stems. It also controls phototropism, causing plants to bend toward light sources by stimulating faster growth on the shaded side.
Submitted by: PaperMCQs
44
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of organisms break down dead organic matter into simpler inorganic substances?

  • A Producers
  • B Decomposers
  • C Consumers
  • D Omnivores
Permalink
Correct Answer: Option B — Decomposers
Explanation: Decomposers such as bacteria and fungi break down dead organic matter into simpler inorganic substances recycling nutrients back into the ecosystem for use by producers.
Submitted by: PaperMCQs
45
Easy ppsc Uploaded: 06 Aug 2026

What is the term for the exchange of genetic material between homologous chromosomes?

  • A Crossing over
  • B Mutation
  • C Duplication
  • D Translocation
Permalink
Correct Answer: Option A — Crossing over
Explanation: Crossing over occurs during meiosis when homologous chromosomes exchange segments of genetic material. This process increases genetic diversity among offspring, contributing to the variation necessary for evolution and adaptation within populations.
Submitted by: PaperMCQs
46
Easy ppsc nts Uploaded: 14 Jul 2026

What is the largest organ in the human body?

  • A Skin
  • B Liver
  • C Lungs
  • D Heart
Permalink
Correct Answer: Option A — Skin
Explanation: The skin is the largest organ of the human body covering the entire external surface and functions as a protective barrier regulating temperature and enabling sensation.
Submitted by: PaperMCQs
47
Easy nts Uploaded: 06 Aug 2026

What is the basic structural and functional unit of life?

  • A Tissue
  • B Cell
  • C Organ
  • D Organelle
Permalink
Correct Answer: Option B — Cell
Explanation: The cell is the smallest unit capable of independent life. All living organisms are composed of one or more cells that carry out essential functions including metabolism, growth, and reproduction, as first described by cell theory.
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48
Easy fpsc Uploaded: 06 Aug 2026

What is the term for organisms that live inside or on another organism and cause it harm?

  • A Parasites
  • B Predators
  • C Symbionts
  • D Scavengers
Permalink
Correct Answer: Option A — Parasites
Explanation: Parasites live in or on a host organism, deriving nutrients at the host's expense, often causing harm or disease. Examples include tapeworms, fleas, and certain protozoa responsible for illnesses like malaria in humans.
Submitted by: PaperMCQs
49
Easy fpsc Uploaded: 06 Aug 2026

Which kingdom includes organisms like mushrooms and yeast?

  • A Plantae
  • B Fungi
  • C Animalia
  • D Protista
Permalink
Correct Answer: Option B — Fungi
Explanation: Fungi form a distinct kingdom of organisms that absorb nutrients from their environment rather than producing food through photosynthesis. They include yeasts, molds, and mushrooms, and play key roles as decomposers in ecosystems.
Submitted by: PaperMCQs
50
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the process by which organisms break down glucose to release energy?

  • A Digestion
  • B Photosynthesis
  • C Cellular respiration
  • D Transpiration
Permalink
Correct Answer: Option C — Cellular respiration
Explanation: Cellular respiration is the process by which organisms break down glucose in the presence of oxygen to produce ATP carbon dioxide and water releasing energy for cellular activities.
Submitted by: PaperMCQs
51
Easy ppsc Uploaded: 06 Aug 2026

Which stage of mitosis involves chromosomes aligning at the cell's equator?

  • A Prophase
  • B Metaphase
  • C Anaphase
  • D Telophase
Permalink
Correct Answer: Option B — Metaphase
Explanation: During metaphase, chromosomes align along the cell's equatorial plane, attached to spindle fibers from opposite poles. This precise alignment ensures that each daughter cell receives an identical and complete set of chromosomes during division.
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52
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas is released by plants as a byproduct of photosynthesis?

  • A Carbon dioxide
  • B Nitrogen
  • C Oxygen
  • D Water vapour
Permalink
Correct Answer: Option C — Oxygen
Explanation: Oxygen is released as a byproduct of photosynthesis during the light-dependent reactions when water molecules are split through photolysis providing electrons to replace those lost by chlorophyll.
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53
Easy pms Uploaded: 06 Aug 2026

What is the term for the smallest unit of heredity that determines a trait?

  • A Chromosome
  • B Allele
  • C Genome
  • D Gene
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Correct Answer: Option D — Gene
Explanation: A gene is a segment of DNA that codes for a specific protein or trait. Genes are located on chromosomes and are inherited from parents, determining characteristics ranging from eye color to disease susceptibility.
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54
Easy nts Uploaded: 06 Aug 2026

What is the process by which plants lose water through leaves called?

  • A Transpiration
  • B Respiration
  • C Photosynthesis
  • D Osmosis
Permalink
Correct Answer: Option A — Transpiration
Explanation: Transpiration is the evaporation of water vapor from plant leaves through stomata. It helps regulate plant temperature, transports nutrients from roots to leaves, and maintains the water balance necessary for healthy plant growth.
Submitted by: PaperMCQs
55
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the basic structural and functional unit of all living organisms?

  • A Tissue
  • B Organ
  • C Nucleus
  • D Cell
Permalink
Correct Answer: Option D — Cell
Explanation: The cell is the basic structural and functional unit of all living organisms as proposed in the cell theory formulated by Schleiden Schwann and Virchow in the 19th century.
Submitted by: PaperMCQs
56
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of disease is caused by a deficiency of essential nutrients in the diet?

  • A Communicable disease
  • B Hereditary disease
  • C Autoimmune disease
  • D Deficiency disease
Permalink
Correct Answer: Option D — Deficiency disease
Explanation: Deficiency diseases result from the lack of essential nutrients in the diet such as vitamins and minerals causing conditions like scurvy rickets anaemia and goitre.
Submitted by: PaperMCQs
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