MEHRAN UNIVERSITY BIOLOGY PAST PAPERS MCQS 2025
MCQ 1
What does “Eco” in ecosystem mean?
A) Habitat
B) Surrounding
C) Biosphere
D) Environment
Right option: B) Surrounding
MCQ 2
What is aging caused due to defect in?
A) Mitochondrial DNA
B) DNA
C) RNA
D) Protein
Right option: A) Mitochondrial DNA
MCQ 3
Which family do roses belong to?
A) Poaceae
B) Liliaceae
C) Rosaceae
D) Fabaceae
Right option: C) Rosaceae
MCQ 4
What are the repeating units of DNA and RNA known as?
A) Nitrogenous bases
B) Nucleotides
C) Nucleosides
D) Phosphate group
Right option: B) Nucleotides
MCQ 5
Which of the following provides energy?
A) Amino Acids
B) Fats
C) Glucose
D) All of the above
Right option: D) All of the above
MCQ 6
Where is the useful part of glomerular filtrate reabsorbed?
A) Loop of Henle
B) Proximal tube
C) Distal tube
D) Collecting duct
Right option: B) Proximal tube
MCQ 7
What biosystem includes non-living and living components?
A) Surrounding
B) Biosphere
C) Ecosystem
D) Community
Right option: C) Ecosystem
MCQ 8
Where are prokaryotic unicellular organisms placed?
A) Kingdom Protists
B) Kingdom Plantae
C) Kingdom Fungi
D) Kingdom Monera
Right option: D) Kingdom Monera
MCQ 9
What are organisms that can reproduce with one another known as?
A) Species
B) Phylum
C) Group
D) Family
Right option: A) Species
MCQ 10
What does glycolysis mean?
A) Formation of glucose
B) Breakdown of glucose
C) Breakdown of amino acids
D) Formation of amino acids
Right option: B) Breakdown of glucose
MCQ 11
What did protists evolve from?
A) Fungi
B) Eukaryotes
C) Prokaryotes
D) Animals
Right option: C) Prokaryotes
MCQ 12
What supports the internal body?
A) Muscle
B) Cartilage
C) Bones
D) All of the above
Right option: D) All of the above
MCQ 13
What is the unit of biology?
A) Genes
B) Cells
C) Tissues
D) Organisms
Right option: B) Cells (However, genes can be considered a unit of heredity)
MCQ 14
What is the outermost covering of a cell?
A) Cell membrane
B) Cell wall
C) Cytoplasm
D) Nucleus
Right option: A) Cell membrane (for animal cells), B) Cell wall (for plant cells)
MCQ 15
What is the main function of a bacterial cell wall?
A) Motility
B) Support
C) Attachment
D) Photosynthesis
Right option: B) Support
MCQ 16
What type of reproduction is cloning?
A) Sexual reproduction
B) Asexual reproduction
C) Budding
D) Regeneration
Right option: B) Asexual reproduction
MCQ 17
What is a transport system other than the blood circulatory system?
A) Respiratory
B) Digestive
C) Nervous
D) Lymphatic
Right option: D) Lymphatic
[1:31 PM, 6/24/2025] Awaiz: MCQ 18
What is the process by which plants make their own food?
A) Respiration
B) Photosynthesis
C) Decomposition
D) Fermentation
Right option: B) Photosynthesis
MCQ 19
What is the primary function of the mitochondria in a cell?
A) Protein synthesis
B) Cell signaling
C) Energy production
D) DNA replication
Right option: C) Energy production
MCQ 20
What is the term for the movement of molecules from an area of high concentration to an area of low concentration?
A) Osmosis
B) Diffusion
C) Active transport
D) Passive transport
Right option: B) Diffusion
MCQs: 21
What are enzymes composed of?
A) Carbohydrates
B) Proteins
C) Lipids
D) Nucleic acids
Right option: B) Proteins
MCQs: 22
What are biological molecules that act as catalysts in living organisms called?
A) Hormones
B) Enzymes
C) Antibodies
D) Receptors
Right option: B) Enzymes
MCQs: 23
What is DNA composed of?
A) Nucleotides
B) Amino acids
C) Fatty acids
D) Sugars
Right option: A) Nucleotides
MCQs: 24
What does glycolysis mean?
A) Formation of glucose
B) Breakdown of glucose
C) Breakdown of amino acids
D) Formation of amino acids
Right option: B) Breakdown of glucose
MCQs: 25
Which fungus is commonly used in bakeries?
A) Aspergillus
B) Saccharomyces cerevisiae (Baker’s yeast)
C) Penicillium
D) Rhizopus
Right option: B) Saccharomyces cerevisiae (Baker’s yeast)
MCQs: 26
What are enzymes composed of?
A) Carbohydrates
B) Proteins
C) Lipids
D) Nucleic acids
Right option: B) Proteins
MCQs: 27
What type of biological molecules are enzymes?
A) Hormones
B) Catalysts
C) Antibodies
D) Receptors
Right option: B) Catalysts
MCQs: 28
What is DNA composed of?
A) Nucleotides
B) Amino acids
C) Fatty acids
D) Sugars
Right option: A) Nucleotides
MCQs: 29
Which family do roses belong to?
A) Poaceae
B) Liliaceae
C) Rosaceae
D) Fabaceae
Right option: C) Rosaceae
MCQs: 30
Where do carbohydrates obtain their source from?
A) Plant only
B) Animal only
C) Both plant and animal
D) None of the above
Right option: C) Both plant and animal
MCQs: 31
What is the difference between prokaryotes and eukaryotes?
A) Cell wall
B) Cell membrane
C) Nucleus
D) Mitochondria
Right option: C) Nucleus
MCQs: 32
What is the unit of classification in biology?
A) Kingdom
B) Phylum
C) Class
D) Species
Right option: A) Kingdom
MCQs: 33
Which animal is amphibian?
A) Frog
B) Snake
C) Fish
D) Lion
Right option: A) Frog
MCQs: 34
From which of the following can energy be obtained?
A) Amino acid
B) Fat
C) Carbohydrates
D) All of the above
Right option: D) All of the above
Biology MCQs
- What is the basic structural and functional unit of living organisms?
A) Tissue
B) Organ
C) Cell
D) Organism
Answer: C) Cell
- Which group of animals can live in both water and on land?
A) Mammals
B) Reptiles
C) Amphibians
D) Birds
Answer: C) Amphibians
- What is the term for a community of living and non-living things that interact with each other in a specific environment?
A) Ecosystem
B) Population
C) Community
D) Biosphere
Answer: A) Ecosystem
- Which type of fungus is commonly used in bakeries?
A) Yeast
B) Mold
C) Mushroom
D) Lichen
Answer: A) Yeast
- What is the composition of DNA?
A) Proteins and lipids
B) Carbohydrates and nucleic acids
C) Nucleic acids and proteins
D) Lipids and carbohydrates
Answer: C) Nucleic acids and proteins
- What are biological molecules?
A) Only proteins
B) Only carbohydrates
C) Only lipids
D) All of the above
Answer: D) All of the above
- What are enzymes composed of?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids
Answer: A) Proteins
- What is hostility?
A) A type of disease
B) A type of behavior
C) A type of environment
D) Not defined in the given options
Answer: D) Not defined in the given options
- What is the meaning of glycolysis?
A) Breakdown of glucose
B) Synthesis of glucose
C) Breakdown of proteins
D) Synthesis of proteins
Answer: A) Breakdown of glucose
- What are enzymes consists of?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids
Answer: A) Proteins
- Roses are which family?
A) Rosaceae
B) Solanaceae
C) Fabaceae
D) Brassicaceae
Answer: A) Rosaceae
- Carbohydrates obtain from plant or animal?
A) Only plant
B) Only animal
C) Both plant and animal
D) Neither plant nor animal
Answer: C) Both plant and animal
- What are prokaryotes and eukaryotes?
A) Types of cells
B) Types of tissues
C) Types of organs
D) Types of organisms
Answer: A) Types of cells
- What is the kingdom in biological classification?
A) A group of related phyla
B) A group of related classes
C) A group of related orders
D) A group of related families
Answer: A) A group of related phyla
- What is an amphibian?
A) A type of mammal
B) A type of reptile
C) A type of animal that lives in both water and on land
D) A type of bird
Answer: C) A type of animal that lives in both water and on land
- What are carbohydrates?
A) A type of protein
B) A type of lipid
C) A type of nucleic acid
D) A type of biomolecule that provides energy
Answer: D) A type of biomolecule that provides energy
Question 51 of 100
What is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. DNA replication
C. Energy production
D. Cell division
Correct Option: C. Energy production
Question 52 of 100
What is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. DNA replication
C. Energy production
D. Cell signaling
Correct Option: C. Energy production
Question 53 of 100
Which of the following is an example of a homologous structure?
A. Wings of birds and insects
B. Forelimbs of vertebrates
C. Eyes of humans and octopuses
D. Scales of fish and reptiles
Correct Option: B. Forelimbs of vertebrates
Question 54 of 100
What is the term for the process by which water moves through a plant, from the roots to the leaves, and is then released into the air as water vapor?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Osmosis
Correct Option: C. Transpiration
Question 55 of 100
Which of the following is a characteristic of mammals?
A. Endothermy
B. Ectothermy
C. Homeothermy
D. Poikilothermy
Correct Option: A. Endothermy
- The study of fossils is called:
A) Environmental Biology
B) Historical biology
C) Palaeontology
D) Social biology
Right option: C) Palaeontology
- Oxygen accounts for % of totals human body mass:
A) 18%
B) 65%
C) 10%
D) 3%
Right option: B) 65%
- The cellular DNA of a bacterium is known as the
A) Histone
B) Genes
C) Chromosomes
D) Plasmid
Right option: C) Chromosomes
- A structure formed by groups of similar cells organized into loose sheets or bundles performing similar functions is called as:
A) An organ
B) An organism
C) A Tissue
D) A Cell
Right option: C) A Tissue
- Maximum number of species of living things on earth are:
A) Algae
B) Fungi
C) Protozoa
D) Insects
Right option: D) Insects
- The haploid number of chromosomes in human beings:
A) 23
B) 4
C) 10
D) 24
Right option: A) 23
- Cellular digestion is associated with which organelle
A) Mitochondria
B) Golgi bodies
C) Plastids
D) Lysosomes
Right option: D) Lysosomes
- The branch of biology which deals with the study of chemical compounds and the chemical processes in the living organisms is called:
A) Chemistry
B) Biochemistry
C) Molecular biology
D) Both a and b
Right option: B) Biochemistry
- Animals which are unable to adjust their internal salt concentration according to external environment is:
A) Anhydrobiosis
B) Osmoregulators
C) Thermoregulatory
D) Osmoconformers
Right option: D) Osmoconformers
- Animals which are unable to adjust their internal salt concentration according to external environment is:
A) Anhydrosis
B) Osmoregulators
C) Thermoregulatory
D) Osmoconformers
Right Option: D) Osmoconformers
- Which one is an organic compound?
A) CO₂
B) Water
C) Lipids
D) HCl
Right Option: C) Lipids
- % of water in brain cells is:
A) 20%
B) 80%
C) 85%
D) 90%
Right Option: C) 85%
- In which of the following location enzymes controlling cellular respiration are present?
A) Nucleus
B) Chloroplast
C) Mitochondria
D) Ribosome
Right Option: C) Mitochondria
- In which of the following location enzymes controlling cellular respiration are present?
A) Nucleus
B) Chloroplast
C) Mitochondria
D) Ribosome
Right option: C) Mitochondria
- Which of the statement about cell membrane is not true?
A) It contains protein molecules embedded in the lipid bilayer
B) It is a differentially permeable membrane.
C) It contains charged pores thus ions being charged particles cross cell membrane much easier than neutral particles.
D) It may get infolded to engulf solid or liquid material.
Right option: C) It contains charged pores thus ions being charged particles cross cell membrane much easier than neutral particles.
- Organisms of which of the following kingdom have an absorptive mode of nutrition:
A) Prokaryotae
B) Protocista
C) Animalia
D) Fungi
Right option: D) Fungi
- Five kingdom classification was proposed by:
A) Carlos Linnaeus
B) E-Chatton
C) Robert Whittaker
D) Lynn Margulis and Karlene Schwartz
Right option: C) Robert Whittaker
- The size of Spirochete is?
A) 0.75-1.25 um
B) 100-200 nm
C) 0.1-600 um
D) 500 um
Right option: C) 0.1-600 um
- Organisms of which of the following kingdom have an absorptive mode of nutrition:
A) Prokaryotae
B) Protista
C) Animalia
D) Fungi
Right Answer: D) Fungi
- Five kingdom classification was proposed by:
A) Carlos Linnaeus
B) E-Chation
C) Robert Whittaker
D) Lynn Margulis and Karlene Schwartz
Right Answer: C) Robert Whittaker
- The size of Spirochete is?
A) 0.75-1.25 um
B) 100-200 nm
C) 0.1-400 um
D) 500 um
Right Answer: C) 0.1-400 um
- The germ theory of disease has ___ postulates.
A) 3
B) 5
C) 4
D) 6
Right Answer: B) 5
- Plasmodium belongs to?
A) Ciliates
B) Apicomplexans
C) Actinopods
D) Foraminiferans
Right Answer: B) Apicomplexans
Biology MCQs – MUET Phase 2 Preparation
25 Important Biology MCQs
- Basic unit of life is:
a) Tissue
b) Organ
c) Cell
d) Organism
Answer: c) Cell
- Which molecule carries genetic information?
a) RNA
b) Protein
c) DNA
d) Enzyme
Answer: c) DNA
- Enzymes are composed of:
a) Lipids
b) Carbohydrates
c) Proteins
d) Nucleic Acids
Answer: c) Proteins
- Which organism is used in bakeries for fermentation?
a) Mushroom
b) Yeast
c) Algae
d) Bacteria
Answer: b) Yeast
- Which family does the rose belong to?
a) Fabaceae
b) Poaceae
c) Rosaceae
d) Solanaceae
Answer: c) Rosaceae
MCQs in Text and MCQ Format
- Carbohydrates in diet are mainly obtained from:
a) Animals
b) Plants
c) Air
d) Fungi
Right option: b) Plants
- Which of the following is a prokaryote?
a) Fungi
b) Algae
c) Bacteria
d) Protists
Right option: c) Bacteria
- Which of the following is an amphibian?
a) Frog
b) Snake
c) Crocodile
d) Turtle
Right option: a) Frog
- Energy is primarily obtained from:
a) Amino Acids
b) Fats
c) Carbohydrates
d) All of these
Right option: d) All of these
- Which vitamin helps with weakness and fatigue?
a) Vitamin A
b) Vitamin B
c) Vitamin D
d) Vitamin K
Right option: b) Vitamin B
- Which organelle is the powerhouse of the cell?
a) Nucleus
b) Ribosome
c) Golgi body
d) Mitochondria
Right option: d) Mitochondria
- Site of photosynthesis is:
a) Mitochondria
b) Cytoplasm
c) Chloroplast
d) Ribosome
Right option: c) Chloroplast
- Gas released during photosynthesis is:
a) Oxygen
b) Nitrogen
c) CO₂
d) Hydrogen
Right option: a) Oxygen
- Human heart has how many chambers?
a) 2
b) 3
c) 4
d) 5
Right option: c) 4
- Which blood group is universal donor?
a) AB
b) A
c) O
d) B
Right option: c) O
- Which enzyme is found in saliva?
a) Trypsin
b) Amylase
c) Pepsin
d) Lipase
Right option: b) Amylase
MCQs in Text and MCQ Format
- Which enzyme is found in saliva?
a) Trypsin
b) Amylase
c) Pepsin
d) Lipase
Right option: b) Amylase
- DNA replication occurs in:
a) Prophase
b) Interphase
c) Metaphase
d) Anaphase
Right option: b) Interphase
- Which part of the neuron receives impulses?
a) Axon
b) Dendrite
c) Synapse
d) Soma
Right option: b) Dendrite
- Which cell organelle contains digestive enzymes?
a) Nucleus
b) Golgi body
c) Ribosome
d) Lysosome
Right option: d) Lysosome
- Which plant tissue transports water?
a) Xylem
b) Phloem
c) Cambium
d) Cortex
Right option: a) Xylem
- Which vitamin helps in blood clotting?
a) Vitamin A
b) Vitamin B
c) Vitamin D
d) Vitamin K
Right option: d) Vitamin K
- Which organ filters blood in the human body?
a) Heart
b) Lung
c) Kidney
d) Liver
Answer: c) Kidney
- AIDS is caused by:
a) Bacteria
b) Fungus
c) Virus
d) Protozoa
Answer: c) Virus
- Malaria is caused by:
a) Virus
b) Bacteria
c) Plasmodium
d) Mosquito bite
Answer: c) Plasmodium
- Largest organ in human body is:
a) Liver
b) Brain
c) Skin
d) Heart
Answer: c) Skin
MCQ 105
What is the nature of enzymes?
A) Fibrous proteins
B) Globular proteins
C) Carbohydrates
D) Lipids
Right Option: B) Globular proteins
MCQ 106
Where does the synthesis of enzymes take place?
A) Transcription
B) Translation
C) Replication
D) Mutation
Right Option: B) Translation
MCQ 107
What is the detachable organic part of an enzyme called?
A) Coenzyme
B) Apoenzyme
C) Holoenzyme
D) Activator
Right Option: A) Coenzyme
MCQ 108
Where are enzymes of photosynthesis found?
A) Mitochondria
B) Chloroplast
C) Ribosomes
D) Lysosomes
Right Option: B) Chloroplast
MCQ 109
What happens when almost all the active sites of an enzyme are occupied?
A) The rate of reaction decreases
B) The rate of reaction remains constant
C) The rate of reaction increases
D) The rate of reaction will be maximum
Right Option: D) The rate of reaction will be maximum
MCQ 110
What is the effect of extreme changes in pH on enzymes?
A) Enzyme activation
B) Enzyme denaturation
C) Enzyme inhibition
D) Enzyme catalysis
Right Option: B) Enzyme denaturation
MCQ 111
What is the composition of the cell membrane?
A) Proteins and carbohydrates
B) Lipids and proteins
C) Carbohydrates and lipids
D) Nucleic acids and proteins
Right Option: B) Lipids and proteins