Aims and Objectives of Practicing these Biology Questions:
To Familiarize Students with JAMB Question Style Practicing these questions helps students understand the format, structure, and wording of JAMB Biology CBT questions.
To Strengthen Key Biology Concepts The questions are designed to reinforce important topics such as ecology, genetics, evolution, physiology, taxonomy, and cell biology.
To Improve Speed and Accuracy Repeated practice trains students to think faster, analyze questions quickly, and pick the correct answers under time pressure.
To Build Confidence for the Examination Attempting many standard questions boosts confidence and reduces exam anxiety, preparing students mentally for the real CBT test.
To Assess Level of Preparedness Students can evaluate their strengths and weaknesses, identify gaps in knowledge, and focus on areas that need more attention.
To Encourage Active Revision Answering questions serves as an active learning method that enhances long-term retention better than passive reading.
To Improve Problem-Solving and Critical Thinking Skills Some questions require logical reasoning, interpretation of diagrams, and application of principles—skills needed for scoring high in JAMB.
✅ 100 JAMB Biology Objective Questions and Answers (CBT Style)
SECTION A — QUESTIONS
1–25
The basic functional unit of a living organism is the A. cell B. tissue C. organ D. system
Which of the following is NOT an example of a connective tissue? A. Cartilage B. Bone C. Blood D. Epithelium
The movement of water molecules across a semi-permeable membrane is called A. diffusion B. osmosis C. active transport D. plasmolysis
The cell organelle responsible for energy production is the A. nucleus B. mitochondrion C. ribosome D. chloroplast
A plant that grows in waterlogged environment is called a A. xerophyte B. mesophyte C. hydrophyte D. saprophyte
The process by which green plants manufacture food is A. respiration B. digestion C. photosynthesis D. excretion
The following are micronutrients EXCEPT A. zinc B. boron C. nitrogen D. copper
In the nitrogen cycle, nitrification is the A. conversion of nitrates to nitrogen gas B. conversion of nitrogen gas to ammonia C. conversion of ammonia to nitrates D. conversion of nitrates to ammonia
The following are characteristics of living organisms EXCEPT A. growth B. reproduction C. respiration D. decay
The part of the brain responsible for balance is the A. cerebrum B. cerebellum C. medulla D. spinal cord
A reflex action is coordinated in the A. brain B. spinal cord C. cerebrum D. cerebellum
Which blood vessel carries blood away from the heart? A. Vein B. Artery C. Capillary D. Venule
The longest bone in the human body is the A. tibia B. femur C. humerus D. fibula
The mode of nutrition in fungi is A. autotrophic B. holozoic C. saprophytic D. parasitic
In a food chain, the original source of energy is the A. green plant B. sun C. herbivore D. producer
An example of a continuous variation is A. blood group B. height C. tongue rolling D. ability to taste PTC
A sudden change in a gene is called A. hybridization B. mutation C. mitosis D. meiosis
A population is A. total number of species in a habitat B. total number of organisms in a community C. organisms of the same species in an area D. number of habitats in a biome
The theory of natural selection was proposed by A. Darwin B. Mendel C. Lamarck D. Pasteur
The organ that secretes insulin is A. liver B. pancreas C. spleen D. kidney
In the human digestive system, protein digestion starts in the A. mouth B. stomach C. ileum D. colon
The following are sexually transmitted infections EXCEPT A. HIV B. syphilis C. gonorrhea D. malaria
The movement of blood around the body is known as A. circulation B. respiration C. excretion D. assimilation
The type of reproduction in yeast is A. fission B. budding C. fragmentation D. spore formation
Which of the following is a vector of malaria? A. Tse-tse fly B. Housefly C. Female Anopheles mosquito D. Cockroach
26–50
Water is lost from the leaves of plants through A. respiration B. osmosis C. transpiration D. translocation
Which of the following causes sleeping sickness? A. Plasmodium B. Trypanosoma C. Salmonella D. Vibrio
A community refers to A. organisms of same species B. population of different species C. collection of habitats D. a large biome
The following are effects of deforestation EXCEPT A. erosion B. desertification C. increased rainfall D. loss of biodiversity
The structural unit of the kidney is the A. nephron B. ureter C. cortex D. pelvis
The element required for chlorophyll formation is A. magnesium B. sodium C. iron D. calcium
A zygote is formed as a result of A. fertilization B. budding C. mitosis D. meiosis
The part of the flower that receives pollen is the A. ovule B. style C. anther D. stigma
Which of the following organisms is prokaryotic? A. Amoeba B. Bacterium C. Paramecium D. Euglena
The major site of gaseous exchange in mammals is the A. trachea B. bronchiole C. alveolus D. pharynx
Which hormone regulates metabolism? A. insulin B. thyroxine C. estrogen D. testosterone
A feature of wind-pollinated flowers is A. bright petals B. sticky pollen C. scent D. long feathery stigma
Meiosis results in A. 2 daughter cells B. 4 daughter cells C. 8 daughter cells D. 16 daughter cells
The habitat with the highest biodiversity is the A. desert B. savanna C. tropical rainforest D. tundra
Which of these is a function of the skeleton? A. digestion B. support C. respiration D. circulation
The largest organ in the human body is the A. liver B. skin C. heart D. kidney
The enzyme that breaks down starch is A. maltase B. amylase C. lactase D. sucrase
The organ responsible for detoxification is the A. lung B. kidney C. liver D. spleen
In plants, transport of manufactured food occurs through A. xylem B. phloem C. cortex D. root hair
The outer protective covering of a plant stem is the A. xylem B. cortex C. phloem D. epidermis
The genetic makeup of an organism is its A. phenotype B. genotype C. allele D. chromosome
The process by which organisms maintain a stable internal environment is A. reproduction B. homeostasis C. metabolism D. osmosis
Red blood cells lack A. cytoplasm B. hemoglobin C. nucleus D. plasma
The DNA molecule is shaped like a A. single helix B. ladder C. double helix D. spiral chain
In ecology, commensalism is A. both species benefit B. one benefits, one harmed C. one benefits, one unaffected D. both harmed
51–75
The smallest bone in the human body is the A. stapes B. femur C. tibia D. fibula
The fluid portion of blood is called A. lymph B. plasma C. serum D. water
In the carbon cycle, carbon dioxide returns to the atmosphere mainly by A. feeding B. respiration C. germination D. translocation
The main excretory product of plants is A. urea B. carbon dioxide C. ammonia D. sweat
The part of the root that absorbs water is the A. cortex B. xylem C. root hairs D. cambium
Which of the following is a renewable natural resource? A. crude oil B. coal C. sunlight D. metal ores
The powerhouse of the cell is the A. nucleus B. golgi body C. mitochondrion D. lysosome
Which of these diseases is caused by bacteria? A. measles B. cholera C. malaria D. ringworm
The functional unit of the nervous system is the A. axon B. dendrite C. neuron D. synapse
Which of these is NOT a blood vessel? A. artery B. capillary C. vein D. nephron
The part of the leaf where most photosynthesis occurs is the A. stomata B. spongy mesophyll C. palisade mesophyll D. epidermis
A gene that masks another is A. recessive B. dominant C. homozygous D. heterozygous
The largest group in classification is A. kingdom B. phylum C. class D. order
The movement of white blood cells to sites of infection is called A. immunity B. coagulation C. phagocytosis D. locomotion
The mode of feeding in mosquito larvae is A. filter feeding B. saprophytic C. parasitic D. chemosynthetic
A pyrimidine base found in DNA is A. adenine B. guanine C. cytosine D. uracil
Which of these is a Mendelian law? A. law of dominance B. law of mutation C. law of selection D. law of evolution
In plants, phototropism is the response to A. water B. gravity C. chemicals D. light
The instrument for measuring humidity is A. thermometer B. hygrometer C. barometer D. anemometer
Ecosystem is made up of A. only abiotic factors B. only biotic factors C. both biotic and abiotic factors D. only plants
Which vertebrate group lays eggs with shells? A. fish B. amphibians C. reptiles D. mammals
The process that converts glucose to energy without oxygen is A. aerobic respiration B. anaerobic respiration C. photosynthesis D. oxidation
The organ for voice production is the A. lung B. larynx C. trachea D. pharynx
Which metal is needed for blood clotting? A. sodium B. calcium C. iron D. zinc
The opening and closing of stomata is controlled by A. root pressure B. guard cells C. cortex D. phloem
76–100
A group of interbreeding organisms is known as A. niche B. species C. population D. community
The waste product excreted by the lungs is A. water vapor B. urea C. ammonia D. uric acid
Pollination by animals is called A. zoophily B. hydrophily C. anemophily D. entomology
Which of these diseases is hereditary? A. malaria B. cholera C. sickle cell anaemia D. tuberculosis
The organ for excretion in flatworms is the A. flame cell B. kidney C. malphigian tubule D. nephridia
Haemoglobin is found in A. white blood cells B. platelets C. red blood cells D. plasma
A plant hormone responsible for elongation is A. auxin B. ethylene C. cytokinin D. gibberellin
Animals that maintain constant body temperature are A. poikilothermic B. warm blooded C. cold blooded D. ectothermic
The outermost layer of the human skin is the A. dermis B. subcutaneous layer C. epidermis D. cortex
The test for starch uses A. Benedict’s solution B. iodine solution C. Fehling’s solution D. copper sulphate
The type of asexual reproduction in Paramecium is A. conjugation B. binary fission C. budding D. spore formation
Which vitamin prevents scurvy? A. vitamin A B. vitamin B C. vitamin C D. vitamin D
An organism that feeds on dead organisms is A. parasite B. saprophyte C. herbivore D. carnivore
The SI unit of energy is A. watt B. joule C. ampere D. calorie
Blood clotting is prevented by A. fibrin B. heparin C. thrombin D. platelets
The canal that connects the throat to the stomach is the A. trachea B. duodenum C. oesophagus D. rectum
The process where plants lose water as droplets is A. transpiration B. guttation C. osmosis D. diffusion
The term ecosystem was first coined by A. Darwin B. Tansley C. Mendel D. Linnaeus
A parasite living inside the host is called A. ectoparasite B. endoparasite C. saprophyte D. commensal
The enzyme that digests proteins is A. lipase B. amylase C. pepsin D. maltase
A mammal that lays eggs is A. bat B. whale C. dolphin D. platypus
The exchange of materials between mother and foetus occurs in the A. uterus B. placenta C. ovary D. cervix
The number of chromosomes in a human gamete is A. 23 B. 46 C. 44 D. 22
Which of the following is NOT a characteristic of arthropods? A. jointed legs B. exoskeleton C. segmentation D. dorsal nerve cord
The group of organisms that make their own food is known as A. consumers B. heterotrophs C. autotrophs D. decomposers
✅ SECTION B — ANSWERS
A
D
B
B
C
C
C
C
D
B
B
B
B
C
B
B
B
C
A
B
B
D
A
B
C
C
B
B
C
A
A
A
D
B
C
B
D
B
C
B
B
B
C
B
D
B
B
C
C
C
A
B
B
B
C
C
C
B
C
D
C
B
A
C
A
C
A
D
B
C
C
B
B
B
B
B
A
A
C
A
C
A
B
C
B
B
C
B
B
B
C
B
B
B
C
D
B
A
D
C
✅ 100 More JAMB Biology Objective Questions and Answers (Set 2)
SECTION A — QUESTIONS
1–25
Which of the following structures is found only in plant cells? A. Ribosome B. Chloroplast C. Mitochondrion D. Nucleus
The part of the microscope that regulates light is the A. stage B. condenser C. diaphragm D. eyepiece
The cell theory was proposed by A. Schleiden and Schwann B. Darwin and Lamarck C. Pasteur and Mendel D. Virchow and Hooke
The movement of particles from a region of high concentration to low concentration is A. osmosis B. diffusion C. active transport D. endocytosis
A tissue that transports water in plants is the A. phloem B. cortex C. xylem D. epidermis
Which organelle contains digestive enzymes? A. lysosome B. ribosome C. nucleus D. vacuole
The deficiency of vitamin D causes A. scurvy B. rickets C. pellagra D. anaemia
An example of a monocot plant is A. maize B. bean C. melon D. pride of Barbados
The simplest form of life is the A. protozoa B. virus C. bacteria D. fungi
A structure used for movement in amoeba is the A. cilia B. flagella C. pseudopodia D. sucker
The part of the digestive system where bile acts is A. stomach B. duodenum C. oesophagus D. colon
The pigment responsible for green color in plants is A. carotene B. melanin C. chlorophyll D. haemoglobin
Red blood cells are specialized for A. blood clotting B. defence C. oxygen transport D. hormone production
Transpiration occurs mainly through the A. epidermis B. guard cells C. stomata D. lenticels
The male reproductive organ in a flower is the A. ovary B. sepal C. pistil D. stamen
The part of the brain that controls heartbeat is the A. cerebellum B. medulla C. cerebrum D. pons
In animal cells, energy is stored as A. cellulose B. starch C. glycogen D. protein
A group of similar cells performing a function is A. organ B. system C. tissue D. organism
The hormone responsible for milk production is A. estrogen B. prolactin C. insulin D. testosterone
Which organisms are known as decomposers? A. fungi and bacteria B. lions and tigers C. ants and beetles D. birds and reptiles
The structure that controls activities of the cell is the A. cytoplasm B. nuclei C. nucleus D. membrane
The organ that helps maintain water balance is the A. heart B. kidney C. lung D. liver
The part of the ear responsible for balance is the A. cochlea B. pinna C. semicircular canals D. auditory nerve
The breakdown of glucose in the absence of oxygen is A. aerobic respiration B. glycolysis C. anaerobic respiration D. combustion
The main function of the large intestine is A. protein digestion B. mineral absorption C. water absorption D. bile secretion
26–50
A plant that survives in dry conditions is A. hydrophyte B. xerophyte C. mesophyte D. epiphyte
The unit of inheritance is A. gene B. chromosome C. DNA D. allele
Crossing over occurs at A. metaphase I B. prophase I C. anaphase II D. telophase I
Which of the following is a fossil fuel? A. water B. coal C. sunlight D. wind
The longest part of the digestive tract is the A. ileum B. stomach C. rectum D. duodenum
The part of a leaf that prevents water loss is A. stomata B. midrib C. cuticle D. guard cell
In the food chain, secondary consumers are A. carnivores B. herbivores C. decomposers D. producers
The functional units of the lungs are A. bronchi B. alveoli C. bronchioles D. trachea
The hormone that regulates sugar level in the blood is A. insulin B. thyroxine C. testosterone D. estrogen
Pollination involving two different flowers on the same plant is A. cross-pollination B. self-pollination C. insect pollination D. wind pollination
Which of these causes tuberculosis? A. virus B. protozoa C. fungi D. bacteria
The exchange of gases in plants occurs through A. stomata B. root hairs C. bud D. anther
A structure found in animal cell but absent in plant cell is A. cell wall B. chloroplast C. centriole D. vacuole
Enzymes are chemically A. vitamins B. lipids C. proteins D. minerals
A habitat refers to A. where an organism lives B. how organisms interact C. number of species in an area D. food an organism eats
Which of the following is a symptom of malaria? A. rash B. fever C. swollen limbs D. toothache
A dominant allele is represented by A. small letter B. capital letter C. symbol “x” D. no notation
The highest level of organization is A. system B. organism C. tissue D. organ
The placenta is formed by the A. ovary B. chorion and endometrium C. kidney and uterus D. cervix
The deficiency of iodine leads to A. kwashiorkor B. rickets C. goitre D. scurvy
The blood vessel with the thinnest walls is A. artery B. vein C. capillary D. venule
The part of the flower that develops into fruit is the A. stigma B. anther C. ovary D. filament
The part of the human skeleton that protects the brain is A. ribs B. skull C. vertebrae D. pelvis
Which gas is necessary for photosynthesis? A. nitrogen B. carbon dioxide C. oxygen D. methane
The excretory structure in earthworms is the A. kidney B. nephridia C. flame cell D. gills
51–75
The human heart has A. 2 chambers B. 3 chambers C. 4 chambers D. 5 chambers
The smallest unit of classification is A. genus B. family C. species D. class
Birds maintain their body temperature by A. sweating B. panting C. shivering D. drinking
The part of the nervous system that acts independently of the brain is A. cerebrum B. spinal cord C. cerebellum D. medulla
A saprophytic organism feeds on A. living host B. dead organic matter C. only plants D. only animals
The type of joint found in the shoulder is A. hinge B. pivot C. ball and socket D. gliding
Which is a sexually transmitted infection? A. cholera B. gonorrhea C. malaria D. measles
The structure of DNA was discovered by A. Crick and Watson B. Darwin and Wallace C. Mendel and Morgan D. Lamarck and Weissman
Which organ filters the blood? A. heart B. kidney C. lungs D. pancreas
The ecological factor that affects plant distribution the most is A. temperature B. humidity C. salinity D. rainfall
The movement of food substances in plants is called A. osmosis B. transportation C. translocation D. transfer
A virus is composed of protein and A. starch B. lipid C. DNA/RNA D. mineral salts
The part of the cell that gives it shape is A. cytoplasm B. vacuole C. cell wall D. nucleus
The organ used for breathing in fish is the A. fin B. scale C. gills D. lungs
Sweat glands occur mainly in the A. dermis B. cortex C. epidermis D. cuticle
Amylase breaks down A. starch B. protein C. fat D. cellulose
Which gas is released during respiration? A. carbon dioxide B. nitrogen C. hydrogen D. oxygen
A group of organisms that resemble each other and can interbreed are A. species B. class C. order D. family
The liquid part of blood without clotting factors is A. plasma B. lymph C. tissue fluid D. serum
The organ that stores bile is the A. liver B. gall bladder C. pancreas D. stomach
An example of an arthropod is A. earthworm B. snail C. crab D. tilapia
A seed begins to grow when it A. gets water B. gets oxygen C. gets warmth D. all of the above
The skeleton that forms the central axis of the body is A. appendicular B. axial C. cranial D. pelvic
An example of a social insect is A. bee B. mosquito C. beetle D. antelope
The part of the male reproductive system that produces sperm is A. urethra B. vas deferens C. scrotum D. testes
76–100
Heat is lost from the body mainly through A. radiation B. conduction C. convection D. sweating
The lens of the eye is used for A. reflection B. refraction C. absorption D. dilation
The element essential for blood formation is A. zinc B. calcium C. iron D. potassium
A disease caused by lack of protein is A. kwashiorkor B. beriberi C. rickets D. scurvy
The most important factor for photosynthesis is A. soil B. light C. air D. sugar
The main organ of excretion in plants is the A. leaf B. stem C. root D. flower
The process of shedding old cuticle in arthropods is A. metamorphosis B. ecdysis C. moulting D. regeneration
In genetics, YY represents A. heterozygous B. genotype C. phenotype D. homozygous dominant
Teeth adapted for tearing flesh are A. incisors B. molars C. canines D. premolars
The organ that produces digestive enzymes in humans is A. liver B. pancreas C. stomach D. kidney
The energy currency of the cell is A. ATP B. DNA C. RNA D. glucose
A biome characterized by very low rainfall is the A. savanna B. tundra C. desert D. rainforest
The type of reproduction involving two parents is A. budding B. asexual C. sexual D. spore formation
An example of a reflex action is A. reading B. blinking C. walking D. singing
The first enzyme that acts on food in the mouth is A. pepsin B. amylase C. lipase D. trypsin
The smallest living organisms are A. fungi B. bacteria C. virus D. protozoa
The part of the plant that anchors it to the soil is A. stem B. leaf C. root D. flower
Producers in an ecosystem are A. herbivores B. carnivores C. green plants D. decomposers
The function of platelets is A. oxygen transport B. clotting of blood C. defence D. hormone production
One function of the liver is A. pumping blood B. detoxification C. digestion of fats D. storing water
The process by which living organisms obtain and use food is A. respiration B. excretion C. nutrition D. digestion
The fat storage tissue in animals is A. adipose tissue B. cartilage C. bone marrow D. ligament
The male gamete in flowering plants is A. embryo B. pollen grain C. ovule D. anther
A disease caused by protozoa is A. cholera B. yellow fever C. malaria D. tuberculosis
The growth response of a plant to gravity is A. hydrotropism B. phototropism C. geotropism D. thigmotropism
