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Biology MCQs

210 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
Useful for academic exams, entry tests, FPSC, PPSC and general science preparation.
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Hard fpsc Uploaded: 06 Aug 2026

Which human body system includes the brain, spinal cord, and nerves?

  • A Circulatory system
  • B Nervous system
  • C Digestive system
  • D Respiratory system
Permalink
Correct Answer: Option B — Nervous system
Explanation: The nervous system coordinates body functions by transmitting electrical and chemical signals between the brain, spinal cord, and peripheral nerves. It controls voluntary movements, involuntary functions, sensory perception, and rapid response to stimuli.
Submitted by: PaperMCQs
22
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the function of the Golgi apparatus in a cell?

  • A Energy production
  • B Protein synthesis
  • C DNA replication
  • D Modifying packaging and dispatching proteins
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Correct Answer: Option D — Modifying packaging and dispatching proteins
Explanation: The Golgi apparatus modifies sorts and packages proteins and lipids received from the endoplasmic reticulum and dispatches them to their correct destinations inside or outside the cell.
Submitted by: PaperMCQs
23
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for the variety of life on Earth including all species ecosystems and genetic variation?

  • A Evolution
  • B Biodiversity
  • C Ecology
  • D Taxonomy
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Correct Answer: Option B — Biodiversity
Explanation: Biodiversity refers to the variety of life on Earth at all levels including genetic diversity species diversity and ecosystem diversity and is essential for ecosystem stability.
Submitted by: PaperMCQs
24
Easy ppsc Uploaded: 06 Aug 2026

Which human body system is responsible for producing hormones?

  • A Nervous system
  • B Skeletal system
  • C Endocrine system
  • D Muscular system
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Correct Answer: Option C — Endocrine system
Explanation: The endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate processes such as growth, metabolism, and reproduction. Key glands include the pituitary, thyroid, adrenal glands, and pancreas.
Submitted by: PaperMCQs
25
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

What is the term for organisms that maintain a stable internal environment despite external changes?

  • A Homeostasis
  • B Adaptation
  • C Metabolism
  • D Evolution
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Correct Answer: Option A — Homeostasis
Explanation: Homeostasis is the ability of living organisms to maintain stable internal conditions such as body temperature blood glucose and pH despite changes in the external environment.
Submitted by: PaperMCQs
26
Easy pms Uploaded: 06 Aug 2026

Photosynthesis primarily occurs in which part of a plant cell?

  • A Chloroplast
  • B Mitochondria
  • C Nucleus
  • D Vacuole
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Correct Answer: Option A — Chloroplast
Explanation: Chloroplasts contain chlorophyll, the green pigment that captures sunlight energy to convert carbon dioxide and water into glucose and oxygen. This process sustains plant growth and supplies oxygen essential for most life on Earth.
Submitted by: PaperMCQs
27
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of tissue in plants transports water and minerals from roots to leaves?

  • A Phloem
  • B Cambium
  • C Epidermis
  • D Xylem
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Correct Answer: Option D — Xylem
Explanation: Xylem is the vascular tissue in plants that transports water and dissolved minerals from the roots upward through the stem to the leaves through a process driven by transpiration.
Submitted by: PaperMCQs
28
Hard ppsc Uploaded: 06 Aug 2026

What is the term for a species introduced to a new environment that causes ecological harm?

  • A Endemic species
  • B Invasive species
  • C Native species
  • D Keystone species
Permalink
Correct Answer: Option B — Invasive species
Explanation: Invasive species are non-native organisms introduced into new ecosystems, often outcompeting native species for resources and disrupting established ecological balance. They can cause significant economic and environmental damage without natural predators to control them.
Submitted by: PaperMCQs
29
Hard pms Uploaded: 06 Aug 2026

What is the term for the sequence of organisms through which energy flows in an ecosystem?

  • A Food web
  • B Trophic level
  • C Biomass pyramid
  • D Food chain
Permalink
Correct Answer: Option D — Food chain
Explanation: A food chain represents a linear sequence showing how energy and nutrients pass from one organism to another, starting with producers and moving through various levels of consumers, ending typically with decomposers.
Submitted by: PaperMCQs
30
Easy ppsc nts Uploaded: 14 Jul 2026

What is the term for the movement of populations of organisms from one region to another seasonally?

  • A Migration
  • B Hibernation
  • C Aestivation
  • D Dormancy
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Correct Answer: Option A — Migration
Explanation: Migration is the seasonal movement of animals from one region to another typically following food availability and climate changes as seen in birds fish and wildebeest.
Submitted by: PaperMCQs
31
Hard css fpsc Uploaded: 14 Jul 2026

What is the scientific study of fungi called?

  • A Bacteriology
  • B Virology
  • C Mycology
  • D Botany
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Correct Answer: Option C — Mycology
Explanation: Mycology is the branch of biology dedicated to the scientific study of fungi including their genetics biochemistry ecology and taxonomy.
Submitted by: PaperMCQs
32
Easy pms Uploaded: 06 Aug 2026

Which system in the human body is responsible for movement and support?

  • A Digestive system
  • B Circulatory system
  • C Nervous system
  • D Skeletal and muscular system
Permalink
Correct Answer: Option D — Skeletal and muscular system
Explanation: The skeletal and muscular systems work together to provide structural support, protect internal organs, and enable body movement. Bones give the body its framework while muscles contract to produce coordinated motion at various joints.
Submitted by: PaperMCQs
33
Medium css Uploaded: 06 Aug 2026

Which human organ is primarily responsible for filtering blood and producing urine?

  • A Liver
  • B Spleen
  • C Pancreas
  • D Kidney
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Correct Answer: Option D — Kidney
Explanation: Kidneys filter waste products and excess fluids from the bloodstream, forming urine for excretion. They also regulate blood pressure, electrolyte balance, and red blood cell production, making them vital for maintaining internal body stability.
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34
Medium css fpsc ppsc Uploaded: 14 Jul 2026

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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Correct Answer: Option A — Mutation
Explanation: A mutation is a permanent change in the DNA sequence of an organism that can alter gene function and may be inherited by offspring potentially causing genetic disorders or driving evolution.
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35
Medium css fpsc ppsc Uploaded: 14 Jul 2026

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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Correct Answer: Option D — Phenotype
Explanation: Phenotype refers to the observable physical and biochemical characteristics of an organism resulting from the interaction of its genotype with the environment.
Submitted by: PaperMCQs
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Medium nts Uploaded: 06 Aug 2026

Which layer of skin contains sweat glands, hair follicles, and blood vessels?

  • A Epidermis
  • B Dermis
  • C Hypodermis
  • D Subcutis
Permalink
Correct Answer: Option B — Dermis
Explanation: The dermis, located beneath the epidermis, houses structures including sweat glands, hair follicles, blood vessels, and nerve endings. It provides strength, elasticity, and support to the skin while regulating body temperature and sensation.
Submitted by: PaperMCQs
37
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which layer of the skin contains melanocytes that produce the pigment responsible for skin colour?

  • A Dermis
  • B Hypodermis
  • C Stratum corneum
  • D Epidermis
Permalink
Correct Answer: Option D — Epidermis
Explanation: Melanocytes are found in the basal layer of the epidermis where they produce melanin the pigment responsible for skin hair and eye colour and for protection from UV radiation.
Submitted by: PaperMCQs
38
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which disease is caused by the deficiency of Vitamin B1 affecting the nervous and cardiovascular systems?

  • A Beriberi
  • B Scurvy
  • C Pellagra
  • D Rickets
Permalink
Correct Answer: Option A — Beriberi
Explanation: Beriberi is caused by Vitamin B1 or thiamine deficiency and affects the nervous and cardiovascular systems causing muscle weakness nerve damage and heart problems.
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39
Medium nts Uploaded: 06 Aug 2026

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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Correct Answer: Option C — Centromere
Explanation: The centromere is the constricted region of a chromosome where two sister chromatids are joined together. It plays a crucial role during cell division by serving as the attachment point for spindle fibers.
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40
Medium fpsc Uploaded: 06 Aug 2026

What is the process by which a caterpillar transforms into a butterfly called?

  • A Metamorphosis
  • B Germination
  • C Fertilization
  • D Pollination
Permalink
Correct Answer: Option A — Metamorphosis
Explanation: Metamorphosis is a biological process involving dramatic physical transformation during development. In complete metamorphosis, insects like butterflies pass through egg, larva, pupa, and adult stages, each with distinct forms and functions.
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