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Biology MCQs

128 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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1
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for the symbiotic relationship where one organism benefits and the other is harmed?

  • A Mutualism
  • B Commensalism
  • C Amensalism
  • D Parasitism
Permalink
Correct Answer: Option D — Parasitism
Explanation: Parasitism is a symbiotic relationship where one organism the parasite benefits at the expense of the other the host causing it harm such as tapeworms in the intestines.
Submitted by: PaperMCQs
2
Medium fpsc Uploaded: 06 Aug 2026

What is the main function of red blood cells?

  • A Fighting infection
  • B Transporting oxygen
  • C Clotting blood
  • D Producing antibodies
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Correct Answer: Option B — Transporting oxygen
Explanation: Red blood cells contain hemoglobin, a protein that binds oxygen in the lungs and releases it to body tissues. They also help carry carbon dioxide back to the lungs for exhalation, sustaining cellular respiration.
Submitted by: PaperMCQs
3
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for two identical alleles for a trait in an organism?

  • A Homozygous
  • B Heterozygous
  • C Carrier
  • D Codominant
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Correct Answer: Option A — Homozygous
Explanation: Homozygous describes an organism that has two identical alleles for a particular gene either both dominant or both recessive determining the trait expressed in the phenotype.
Submitted by: PaperMCQs
4
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which blood group is known as the universal recipient?

  • A O negative
  • B AB positive
  • C A positive
  • D B positive
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Correct Answer: Option B — AB positive
Explanation: AB positive blood group is the universal recipient because individuals with this blood type can receive blood from donors of any ABO and Rh blood group.
Submitted by: PaperMCQs
5
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which type of plant reproduction involves new plants growing from cuttings runners or bulbs?

  • A Pollination
  • B Fertilisation
  • C Seed dispersal
  • D Vegetative propagation
Permalink
Correct Answer: Option D — Vegetative propagation
Explanation: Vegetative propagation is a form of asexual reproduction where new plants grow from vegetative parts such as cuttings runners bulbs or tubers without the need for seeds or flowers.
Submitted by: PaperMCQs
6
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the name of the pigment in red blood cells that carries oxygen?

  • A Melanin
  • B Chlorophyll
  • C Haemoglobin
  • D Myoglobin
Permalink
Correct Answer: Option C — Haemoglobin
Explanation: Haemoglobin is the iron-containing protein in red blood cells that binds to oxygen in the lungs and transports it to tissues throughout the body for cellular respiration.
Submitted by: PaperMCQs
7
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the scientific name for the study of classification of organisms?

  • A Morphology
  • B Ecology
  • C Taxonomy
  • D Physiology
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Correct Answer: Option C — Taxonomy
Explanation: Taxonomy is the branch of biology dealing with the classification identification and naming of organisms into a hierarchical system of kingdoms phyla classes orders families genera and species.
Submitted by: PaperMCQs
8
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which part of the brain controls vital involuntary functions such as breathing heart rate and blood pressure?

  • A Cerebrum
  • B Cerebellum
  • C Thalamus
  • D Medulla oblongata
Permalink
Correct Answer: Option D — Medulla oblongata
Explanation: The medulla oblongata located in the brainstem regulates vital involuntary functions including breathing heart rate blood pressure and reflexes essential for survival.
Submitted by: PaperMCQs
9
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for all the populations of different species living and interacting in the same area?

  • A Community
  • B Population
  • C Biosphere
  • D Ecosystem
Permalink
Correct Answer: Option A — Community
Explanation: A community is an assemblage of populations of different species that live and interact in the same geographical area at a given time sharing resources and affecting each other.
Submitted by: PaperMCQs
10
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Who discovered the double helix structure of DNA?

  • A Charles Darwin and Gregor Mendel
  • B Robert Hooke and Anton van Leeuwenhoek
  • C James Watson and Francis Crick
  • D Louis Pasteur and Robert Koch
Permalink
Correct Answer: Option C — James Watson and Francis Crick
Explanation: James Watson and Francis Crick discovered the double helix structure of DNA in 1953 using X-ray diffraction data from Rosalind Franklin and Maurice Wilkins.
Submitted by: PaperMCQs
11
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of RNA brings amino acids to the ribosome during protein synthesis?

  • A mRNA
  • B rRNA
  • C tRNA
  • D snRNA
Permalink
Correct Answer: Option C — tRNA
Explanation: Transfer RNA or tRNA is responsible for bringing specific amino acids to the ribosome during translation each tRNA has an anticodon that matches a codon on the mRNA.
Submitted by: PaperMCQs
12
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for a substance that triggers an immune response in the body?

  • A Antibody
  • B Enzyme
  • C Antigen
  • D Hormone
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Correct Answer: Option C — Antigen
Explanation: An antigen is any substance usually a protein on the surface of a pathogen that is recognised as foreign by the immune system and triggers the production of specific antibodies.
Submitted by: PaperMCQs
13
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
14
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
Permalink
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
15
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
Permalink
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
16
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
Permalink
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
17
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
Permalink
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
18
Hard css fpsc Uploaded: 14 Jul 2026

What is the scientific study of fungi called?

  • A Bacteriology
  • B Virology
  • C Mycology
  • D Botany
Permalink
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
19
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
Permalink
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.
Submitted by: PaperMCQs
20
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
Permalink
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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