100 important MCQs on Zoology, segregated chapter-wise, based on previous competitive exams like UPSC, SSC, Railway, Banking, and State PCS.
1. Animal Kingdom (Classification & Characteristics) (1-25)
Which of the following is the largest phylum in the animal kingdom?
a) Chordata
b) Mollusca
c) Arthropoda
d) Porifera
Ans:
c) Arthropoda
Which phylum includes animals with a notochord?
a) Arthropoda
b) Mollusca
c) Chordata
d) Porifera
Ans:
c) Chordata
Which class of vertebrates lays eggs and suckles their young?
a) Birds
b) Mammals
c) Amphibians
d) Fish
Ans:
b) Mammals
Which of the following animals does not have a backbone?
a) Fish
b) Earthworm
c) Frog
d) Snake
Ans:
b) Earthworm
Which phylum includes segmented worms?
a) Mollusca
b) Annelida
c) Arthropoda
d) Echinodermata
Ans:
b) Annelida
Which phylum does the octopus belong to?
a) Arthropoda
b) Mollusca
c) Annelida
d) Echinodermata
Ans:
b) Mollusca
Which of the following is the largest living mammal?
a) Elephant
b) Blue Whale
c) Giraffe
d) Gorilla
Ans:
b) Blue Whale
The process of shedding old skin in reptiles is called:
a) Molting
b) Regeneration
c) Reproduction
d) Ecdysis
Ans:
d) Ecdysis
Which of the following animals is known for changing its color?
a) Chameleon
b) Crocodile
c) Tortoise
d) Bat
Ans:
a) Chameleon
Which of the following is not a bird?
a) Penguin
b) Ostrich
c) Bat
d) Peacock
Ans:
c) Bat
Which of the following is the fastest land animal?
a) Cheetah
b) Tiger
c) Horse
d) Kangaroo
Ans:
a) Cheetah
Which animal has the longest lifespan?
a) Elephant
b) Tortoise
c) Blue Whale
d) Crocodile
Ans:
b) Tortoise
Which phylum includes jellyfish?
a) Echinodermata
b) Arthropoda
c) Coelenterata
d) Mollusca
Ans:
c) Coelenterata
Which of the following is a flightless bird?
a) Sparrow
b) Ostrich
c) Eagle
d) Hawk
Ans:
b) Ostrich
Which invertebrate is known as a living fossil?
a) Horseshoe Crab
b) Octopus
c) Starfish
d) Earthworm
Ans:
a) Horseshoe Crab
Which of the following has the most number of species?
a) Mammals
b) Amphibians
c) Reptiles
d) Insects
Ans:
d) Insects
Which is the only mammal capable of true flight?
a) Bat
b) Flying Squirrel
c) Kangaroo
d) Lemur
Ans:
a) Bat
Which phylum do sponges belong to?
a) Porifera
b) Mollusca
c) Arthropoda
d) Annelida
Ans:
a) Porifera
Which of the following is a cold-blooded animal?
a) Dog
b) Human
c) Frog
d) Elephant
Ans:
c) Frog
Which of the following is a mammal?
a) Crocodile
b) Lizard
c) Bat
d) Toad
Ans:
c) Bat
Which of the following is the heaviest flying bird?
a) Albatross
b) Bald Eagle
c) Kori Bustard
d) Vulture
Ans:
c) Kori Bustard
Which of the following is a parasite?
a) Amoeba
b) Plasmodium
c) Paramecium
d) Euglena
Ans:
b) Plasmodium
Which animal is known as the “ship of the desert”?
a) Horse
b) Camel
c) Donkey
d) Elephant
Ans:
b) Camel
Which of the following is a marsupial?
a) Tiger
b) Elephant
c) Kangaroo
d) Bear
Ans:
c) Kangaroo
Which of the following is a mammal that lays eggs?
a) Kangaroo
b) Platypus
c) Dolphin
d) Whale
Ans:
b) Platypus
Here are questions 26 to 50, completing the Human Physiology section.
2. Human Physiology (26-50)
The functional unit of the kidney is called:
a) Neuron
b) Nephron
c) Alveolus
d) Villus
Ans:
b) Nephron
Which hormone regulates blood sugar levels?
a) Adrenaline
b) Insulin
c) Thyroxine
d) Estrogen
Ans:
b) Insulin
The normal pH of human blood is:
a) 6.8
b) 7.4
c) 5.5
d) 8.1
Ans:
b) 7.4
Which part of the brain controls balance and coordination?
a) Cerebrum
b) Cerebellum
c) Medulla Oblongata
d) Thalamus
Ans:
b) Cerebellum
Which gland is known as the "master gland" in the human body?
a) Pituitary gland
b) Adrenal gland
c) Thyroid gland
d) Pancreas
Ans:
a) Pituitary gland
Which vitamin is essential for blood clotting?
a) Vitamin A
b) Vitamin B
c) Vitamin K
d) Vitamin C
Ans:
c) Vitamin K
What is the main function of hemoglobin in the blood?
a) Transport oxygen
b) Fight infections
c) Digest food
d) Remove waste
Ans:
a) Transport oxygen
Which organ is responsible for detoxification in the human body?
a) Heart
b) Kidney
c) Liver
d) Lungs
Ans:
c) Liver
Which part of the digestive system absorbs nutrients?
a) Stomach
b) Small intestine
c) Large intestine
d) Esophagus
Ans:
b) Small intestine
Which chamber of the human heart pumps oxygenated blood to the body?
a) Right atrium
b) Right ventricle
c) Left atrium
d) Left ventricle
Ans:
d) Left ventricle
Which is the largest organ in the human body?
a) Liver
b) Skin
c) Brain
d) Heart
Ans:
b) Skin
Which of the following is a reflex action?
a) Walking
b) Talking
c) Blinking of eyes
d) Eating
Ans:
c) Blinking of eyes
Which type of muscle is involuntary and found in the walls of internal organs?
a) Skeletal muscle
b) Smooth muscle
c) Cardiac muscle
d) Striated muscle
Ans:
b) Smooth muscle
Which blood group is the universal donor?
a) A
b) B
c) AB
d) O negative
Ans:
d) O negative
What is the main function of the alveoli in the lungs?
a) Pump blood
b) Filter air
c) Exchange gases
d) Absorb nutrients
Ans:
c) Exchange gases
What is the primary function of the large intestine?
a) Digestion of food
b) Absorption of water
c) Breaking down proteins
d) Producing enzymes
Ans:
b) Absorption of water
Which organ is primarily responsible for producing bile?
a) Kidney
b) Liver
c) Stomach
d) Pancreas
Ans:
b) Liver
Which part of the human body produces red blood cells?
a) Liver
b) Bone marrow
c) Spleen
d) Heart
Ans:
b) Bone marrow
Which of the following is an exocrine gland?
a) Thyroid gland
b) Pituitary gland
c) Salivary gland
d) Adrenal gland
Ans:
c) Salivary gland
Which enzyme is present in saliva and helps in digestion of starch?
a) Pepsin
b) Amylase
c) Trypsin
d) Lipase
Ans:
b) Amylase
Which part of the human eye is responsible for vision in dim light?
a) Cones
b) Rods
c) Cornea
d) Iris
Ans:
b) Rods
Which hormone is responsible for growth in humans?
a) Insulin
b) Growth hormone
c) Oxytocin
d) Adrenaline
Ans:
b) Growth hormone
Which organ produces insulin in the human body?
a) Liver
b) Kidney
c) Pancreas
d) Gallbladder
Ans:
c) Pancreas
Which part of the ear is responsible for maintaining balance?
a) Cochlea
b) Tympanum
c) Semicircular canals
d) Eardrum
Ans:
c) Semicircular canals
Which organ in the human body is known as the "powerhouse of the cell"?
a) Nucleus
b) Mitochondria
c) Ribosome
d) Lysosome
Ans:
b) Mitochondria
Here are questions 51 to 75, covering Genetics & Evolution in Zoology.
3. Genetics & Evolution (51-75)
Who is known as the "Father of Genetics"?
a) Charles Darwin
b) Gregor Mendel
c) Louis Pasteur
d) Watson & Crick
Ans:
b) Gregor Mendel
Which of the following carries genetic information?
a) RNA
b) DNA
c) Enzymes
d) Hormones
Ans:
b) DNA
Which scientist proposed the theory of evolution by natural selection?
a) Jean-Baptiste Lamarck
b) Charles Darwin
c) Gregor Mendel
d) Watson & Crick
Ans:
b) Charles Darwin
Which of the following is a sex-linked disorder?
a) Hemophilia
b) Diabetes
c) Tuberculosis
d) Malaria
Ans:
a) Hemophilia
The term "mutation" was coined by:
a) Darwin
b) Hugo de Vries
c) Gregor Mendel
d) Robert Hooke
Ans:
b) Hugo de Vries
What is the full form of DNA?
a) Deoxyribonucleic Acid
b) Dinucleic Acid
c) Dehydro Nucleic Acid
d) None of the above
Ans:
a) Deoxyribonucleic Acid
Which type of RNA carries amino acids to ribosomes for protein synthesis?
a) mRNA
b) rRNA
c) tRNA
d) snRNA
Ans:
c) tRNA
What is the basic unit of heredity?
a) Gene
b) Chromosome
c) DNA
d) Protein
Ans:
a) Gene
Which type of reproduction involves only one parent?
a) Asexual
b) Sexual
c) Hybrid
d) Binary
Ans:
a) Asexual
Which of the following is an example of an inherited trait?
a) Language
b) Eye color
c) Writing skills
d) Eating habits
Ans:
b) Eye color
The human genome consists of how many pairs of chromosomes?
a) 23
b) 22
c) 24
d) 21
Ans:
a) 23
Which of the following is an example of a fossil?
a) Dinosaur bones
b) Bacteria
c) DNA
d) Red Blood Cells
Ans:
a) Dinosaur bones
What is the main function of ribosomes?
a) Energy production
b) Protein synthesis
c) DNA replication
d) Digestion
Ans:
b) Protein synthesis
Which theory states that all living organisms share a common ancestor?
a) Big Bang Theory
b) Cell Theory
c) Evolution Theory
d) Germ Theory
Ans:
c) Evolution Theory
Which of the following is an example of a vestigial organ in humans?
a) Kidney
b) Appendix
c) Liver
d) Heart
Ans:
b) Appendix
Which law of Mendel states that alleles separate independently during gamete formation?
a) Law of Segregation
b) Law of Independent Assortment
c) Law of Dominance
d) Law of Evolution
Ans:
b) Law of Independent Assortment
Which of the following is an example of an acquired trait?
a) Eye color
b) Hair color
c) Language skills
d) Blood group
Ans:
c) Language skills
Which gas was not present in Earth's early atmosphere?
a) Oxygen
b) Carbon dioxide
c) Methane
d) Ammonia
Ans:
a) Oxygen
Which scientist discovered the structure of DNA?
a) Gregor Mendel
b) Watson & Crick
c) Charles Darwin
d) Robert Hooke
Ans:
b) Watson & Crick
Which of the following is an example of a chromosomal disorder?
a) Diabetes
b) Down syndrome
c) Tuberculosis
d) Influenza
Ans:
b) Down syndrome
Which organelle contains its own DNA?
a) Nucleus
b) Mitochondria
c) Ribosome
d) Lysosome
Ans:
b) Mitochondria
Which type of inheritance follows a 3:1 ratio in offspring?
a) Codominance
b) Mendelian inheritance
c) Multiple alleles
d) Linkage
Ans:
b) Mendelian inheritance
Which of the following scientists is associated with the Germ Plasm Theory?
a) Gregor Mendel
b) August Weismann
c) Charles Darwin
d) Jean-Baptiste Lamarck
Ans:
b) August Weismann
Which chromosome pair determines the sex of a human?
a) 21st pair
b) 22nd pair
c) 23rd pair
d) 24th pair
Ans:
c) 23rd pair
What is the process by which organisms better adapted to their environment tend to survive and reproduce?
a) Genetic drift
b) Natural selection
c) Artificial selection
d) Hybridization
Ans:
b) Natural selection
Here are questions 76 to 100, covering Ecology, Microbiology, and Diseases & Immunology in Zoology.
4. Ecology & Microbiology (76-90)
Which gas is responsible for global warming?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Helium
Ans:
b) Carbon dioxide
Which of the following is a biotic factor in an ecosystem?
a) Sunlight
b) Water
c) Plants
d) Air
Ans:
c) Plants
Which microorganism is used in the production of antibiotics?
a) Fungi
b) Virus
c) Bacteria
d) Protozoa
Ans:
c) Bacteria
Which of the following is the largest ecosystem on Earth?
a) Desert
b) Forest
c) Ocean
d) Grassland
Ans:
c) Ocean
Which type of bacteria converts nitrogen into a usable form for plants?
a) Decomposers
b) Nitrogen-fixing bacteria
c) Pathogens
d) Photosynthetic bacteria
Ans:
b) Nitrogen-fixing bacteria
Which symbiotic relationship benefits both species?
a) Commensalism
b) Parasitism
c) Mutualism
d) Predation
Ans:
c) Mutualism
What is the primary source of energy for most ecosystems?
a) Wind
b) Sunlight
c) Soil
d) Water
Ans:
b) Sunlight
Which of the following is considered a greenhouse gas?
a) Nitrogen
b) Methane
c) Oxygen
d) Helium
Ans:
b) Methane
Which of the following microorganisms is responsible for fermentation?
a) Virus
b) Fungi
c) Yeast
d) Algae
Ans:
c) Yeast
Which of the following causes malaria?
a) Virus
b) Bacteria
c) Protozoa
d) Fungus
Ans:
c) Protozoa
Which of the following is an abiotic component of an ecosystem?
a) Animals
b) Plants
c) Rocks
d) Bacteria
Ans:
c) Rocks
Which type of ecological pyramid is always upright?
a) Pyramid of Biomass
b) Pyramid of Energy
c) Pyramid of Numbers
d) All of the above
Ans:
b) Pyramid of Energy
What is the main function of decomposers in an ecosystem?
a) Produce oxygen
b) Recycle nutrients
c) Capture solar energy
d) Store water
Ans:
b) Recycle nutrients
Which type of pollution is caused by excessive nitrogen and phosphorus in water bodies?
a) Air pollution
b) Eutrophication
c) Soil pollution
d) Noise pollution
Ans:
b) Eutrophication
Which gas is mainly responsible for acid rain?
a) Carbon dioxide
b) Sulfur dioxide
c) Oxygen
d) Methane
Ans:
b) Sulfur dioxide
5. Diseases & Immunology (91-100)
Which disease is caused by a deficiency of vitamin C?
a) Rickets
b) Scurvy
c) Beriberi
d) Pellagra
Ans:
b) Scurvy
Which disease is caused by a lack of insulin production?
a) Diabetes
b) Tuberculosis
c) Malaria
d) Cholera
Ans:
a) Diabetes
Which of the following is a viral disease?
a) Typhoid
b) Tuberculosis
c) Rabies
d) Leprosy
Ans:
c) Rabies
Which organ is affected by jaundice?
a) Heart
b) Liver
c) Lungs
d) Brain
Ans:
b) Liver
Which disease is caused by a mosquito bite?
a) Cholera
b) Tuberculosis
c) Malaria
d) Typhoid
Ans:
c) Malaria
Which type of immunity is obtained after vaccination?
a) Passive immunity
b) Innate immunity
c) Artificial active immunity
d) Natural immunity
Ans:
c) Artificial active immunity
Which blood cells help in fighting infections?
a) Red Blood Cells
b) White Blood Cells
c) Platelets
d) Plasma
Ans:
b) White Blood Cells
Which part of the body is affected by tuberculosis?
a) Liver
b) Lungs
c) Kidneys
d) Stomach
Ans:
b) Lungs
Which virus causes AIDS?
a) Hepatitis B
b) HIV
c) H1N1
d) Dengue
Ans:
b) HIV
Which disease is caused by the deficiency of vitamin D?
a) Rickets
b) Scurvy
c) Night blindness
d) Beriberi
Ans:
a) Rickets
