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41) Which of the following characteristics is typical of the phylum Arthropoda? A. Radial symmetry B. Closed circulatory system C. Endoskeleton made of bones D. Presence of a segmented body 42) Which of the following is an example of conserving resources in an ecosystem A. Excessive use of chemical fertilizers in agriculture B. Introducing invasive species to an ecosystem C. Implementing sustainable fishing practices D. Cutting down trees for timber production 43) Which of the following represents the correct hierarchical organization of life from the smallest to the largest scale? A. Organs, tissues, cells, organisms, populations, communities, ecosystems B. Cells, organs, tissues, organisms, populations, communities, ecosystems C. Tissues, organs, cells, organisms, populations, communities, ecosystems D. Cells, tissues, organs, organisms, populations, communities, ecosystems 44) Which of the following blood vessels carries oxygenated blood away from the heart? A. Arteries B. Venules C. Capillaries D. Veins 45) Which of the following describes the inheritance of traits from parents to offspring A. Evolution B. Adaptation C. Genetics D. Natural selection 46) Which of the following factors primarily affects the distribution of organisms in an ecosystem A. Wind speed B. Soil pH C. Temperature D. Day length 47) Which of the following is NOT a method of reproduction in animals? A. Asexual reproduction B. Budding C. Sexual reproduction D. Sporulation 48) Which of the following statements is true about the kingdom Fungi? A. Fungi obtain nutrients by absorbing organic matter B. Fungi are photosynthetic organisms C. Fungi are multicellular organisms D. Fungi reproduce through the formation of seeds 49) Viviparity refers to the reproductive strategy in which A. Offspring are produced by internal fertilization B. Offspring are produced by external fertilization C. Offspring develop and are nourished inside the female's body D. Offspring develop and are nourished outside the female's body 50) Which of the following is the most inclusive level of classification in the Linnaean system? A. Kingdom B. Phylum C. Domain D. Class

22) The natural place of an organism or community is known as A. Niche B. Habit C. Biome D. Habitat 23) Which process in the nutrient cycle converts atmospheric nitrogen into a form that plants can utilize? A. Denitrification B. Nitrogen fixation C. Ammonification D. Nitrification 24) Which of the following functions is performed by the skin to help maintain homeostasis in the human body? A. Regulation of body temperature B. Filtration of blood C. Production of hormones D. Digestion of food 25) Which of the following soil types becomes less fertile due to the intense leaching caused by tropical rains? A. Yellow soil B. Laterite soil C. Red soils D. Black soil 26) Which type of reproduction involves the fusion of gametes from two parents? A. Sexual reproduction B. Asexual reproduction C. Binary fission D. Budding 27) Which processes are involved in nutrient cycling in a functioning ecosystem? A. Erosion, weathering, and sedimentation B. Decomposition, evaporation, and precipitation C. Nitrogen fixation, denitrification, and ammonification D. Respiration, photosynthesis, and transpiration. 28) What is autotrophic nutrition? A. Nutrition in which organisms obtain food by breaking down complex organic compounds. B. Nutrition in which organisms obtain food from other organisms C. Nutrition in which organisms obtain food by consuming both plants and animals D. Nutrition in which organisms produce their own food using energy from the sun or inorganic substances 29) The theory of evolution can be defined as A. The belief that all species were created in their current form B. The hypothesis that organisms strive to improve themselves over generations C. The idea that species change over time through natural processes D. The concept that evolution occurs through a series of sudden and dramatic changes 30) Which of the following is a male reproductive organ in humans? A. Uterus B. Ovary C. Testis D. Fallopian tube 31) Which of the following is an example of a behavioral adaptation for survival in animals? A. Sharp teeth B. Migration C. Wings D. Camouflage 32) Which of the following traits is not visible in a person with Down syndrome? A. Short neck B. High muscle tone C. Small stature D. Slant eyes 33) What is the definition of population ecology? A. The study of interactions between organisms and their physical environment B. The study of evolutionary processes and their effects on populations C. The study of interactions between different populations in an ecosystem D. The study of the distribution and abundance of individuals within a species 34) What is the term used to describe the maximum number of individuals of a species that an environment can support indefinitely? A. Ecological niche B. Limiting factor C. Carrying capacity D. Density-dependent factor 35) Which of the following statements about the heart is true? A. The heart is responsible for the production of red blood cells B. The heart pumps oxygenated blood to the lungs C. The heart receives blood from the kidneys and filters waste products D. The heart is a muscular organ that contracts to circulate blood throughout the body 36) What is the primary source of variation in a population? A. Gene flow B. Mutation C. Natural selection D. Genetic drift https://whatsapp.com/channel/0029VarOc8iCHDyu2Jzsdc3g 37) Which component of blood is responsible for carrying oxygen to the body tissues? A. Platelets B. White blood cells C. Red blood cells D. Plasma 38) What are the primary products of photosynthesis? A. Carbon dioxide and water B. Glucose and oxygen C. Glucose and carbon dioxide D. Oxygen and water 39) The alternate form of a gene is A. Alternate type B. Dominant character C. Recessive character D. Allele 40) Which organs are part of the alimentary canal in the human digestive system? A. Salivary glands, tongue, and pharynx B. Large intestine, appendix, and rectum C. Stomach, liver, and gallbladder D. Oesophagus, pancreas, and small intestine

*BIOLOGY JAMB PAST QUESTIONS AND ANSWERS 📚📝💯🧠* 1) Which of the following is an example of a microorganism in action as a disease vector? A. Fungi decomposing dead plant material B. Mosquito transmitting malaria C. Bacteria causing food poisoning D. Algae producing oxygen through photosynthesis 2) Which of the following is a characteristic of cells related to irritability? A. Ability to respond to stimuli B. Ability to synthesize proteins C. Ability to generate energy D. Ability to replicate DNA 3) The membrane around the vacuole is known as A. Elaioplast B. Amyloplast C. Tonoplast D. Cytoplast 4) Which of the following is evidence of evolution? A. All of the above. B. Similarities in embryonic development C. Fossils of extinct organisms D. Homologous structures in different species 5) Which of the following is an example of an adaptation for survival in social insects? A. Migration to warmer climates B. Production of venom for defense C. Formation of complex caste systems D. Hibernation during winter months 6) Which of the following is NOT a part of the alimentary canal? A. Oesophagus B. Large intestine C. Liver D. Small intestine 7) Which of the following is an evolutionary trend commonly observed in organisms? A. Decreased complexity over time B. Increased dependence on external resources C. Increased genetic diversity within populations D. Decreased adaptation to the environment 8) Which of the following is a characteristic feature of Kingdom Plantae? A. Presence of chloroplasts B. Ability to perform photosynthesis C. Lack of cell walls D. Heterotrophic mode of nutrition 9) A biome characterized by hot summer, warm winter and treeless vegetation is A. Steppe grasslands B. Temperate deserts C. Savannah grassland D. Tropical deserts 10) Which of the following is an example of physiological variation in organisms? A. Variation in blood pressure among individuals B. Variation in beak shape among finches C. Differences in fur color in rabbits D. Variation in leaf shape in plants 11) Which of the following are components of the skeletal system in humans? A. Cartilage and blood vessels B. Ligaments and tendons C. Muscles and nerves D. Bones and joints 12) Which of the following represents an example of ecological management and conservation through a biological association? A. Construction of a dam for hydroelectric power B. Introduction of an invasive species for pest control C. Clear-cutting of a forest for timber extraction D. Establishment of marine protected areas 13) The term cell was given by A. Robert Hooke B. Schwann C. De Bary D. Tatum 14) Which of the following is the primary organ involved in gas exchange during respiration in humans? A. Diaphragm B. Bronchi C. Lungs D. Trachea 15) Which gland is responsible for producing the hormone insulin? A. Thyroid gland B. Pituitary gland C. Pancreas D. Adrenal gland 16) Most fishes do not sink in water because of the presences of: I. swim bladder II. air bladder III. air sacs IV. air in spongy bones A. II and III are correct B. I and II are correct C. I, II, III and IV are correct D. III and IV are correct 17) In monohybrid inheritance, if an organism carries two different alleles for a particular gene, it is called: A. Homozygous B. Dominant C. Heterozygous D. Recessive 18) What is the tissue responsible for transporting water and minerals from the roots to the rest of the plant? A. Xylem B. Epidermis C. Parenchyma D. Phloem 19) Which of the following is an example of an abiotic ecological factor? A. Temperature B. Competition C. Predation D. Symbiosis 20) Which of the following processes is involved in the reproduction of developing organisms? A. Budding B. Germination C. Fertilization D. Pollination 21) Behavioral adaptation for dealing with a hot climate could include A. Hibernating during the hottest part of the day B. Large scales on the back of a lizard C. Feeding during the hottest part of the day D. A small kidney to conserve water

22)The situation obtained when a perfect gas expands into a vacuum is A. ΔH is positive and TΔ S is zero B. ΔH is positive and T Δ S is negative C. ΔH is negative and TΔ S is zero D. ΔH is zero and T Δ S is positive 23)The general formula of alkanones is A. RCHO B. R2 CO C. RCOOH D. RCOOR 24)The alkanoic acid found in human sweat is A. CH3 -COOH B. CH3 —CH2 —COOH C. H-COOH D. CH3 25)The elements in the periodic table are listed in order of increasing A. relative atomic number B. atomic mass C. relative isotopic mass D. nuclear charge 26)H2 S(g)+ Cl2(g)→ 2HCl(g)+ S(g) In the reaction above, the substance that is reduced is A. H2 S B. S C. HCl D. Cl2 27)Which of the compounds is composed of Al, Si, O and H? A. Elson salt B. Limestone C. Clay D. Urea 28)When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as A. disintegration B. polymerization C. cracking D. degradation 29)In the removal of water hardness, permutit is regenerated with a strong solution of A. NaOH B. Na3 SO4 C. Na3 CO3 D. NaCl 30)A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by A. boiling the water B. adding excess calcium hydroxide C. adding a calculated amount of calcium hydroxide D. adding sodium carbonate 31)Which of the following separation techniques can be employed in obtaining solvent from its solution? A. Evaporation B. Distillation C. Filtration D. Precipitation 32)In the upper atmosphere, the ultra-violet light breaks off a free chlorine atom from chlorofluorocarbon molecule. The effect of this is that the free chlorine atom will A. be very reactive and will attack ozone B. be non-reactive and will not attack ozone C. not change the level of ozone in the atmosphere D. increase the level of ozone in the atmosphere 33)A given amount of gas occupies 10.0dm\(^3\) at 4atm and 273°C. The number of moles of the gas present is? [Molar volume of gas at s.t.p = 22.4dm\(^3\)] A. 0.89 mol B. 1.90 mol C. 3.80 mol D. 5.70 mol 34)According to Charles' law, the volume of a gas becomes zero at A. 0°C B. -100°C C. -273°C D. -373°C 35)A substance that is used as a ripening agent for fruits is A. ethene B. propane C. methane D. butane 36)The Sulphide which is insoluble in dilute hydrochloric acid i A. FeS B. CuS C. ZnS D. Na2S 37)What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide A. 14 B. 13 C. 12 D. 11 38)The type of bonding in [Cu(NH\(_3\))\(^4\)(^{2+}\) is A. coordinate B. electrovalent C. metallic D. covalent 39)Which of the following is an example of a chemical change? A. dissolution of salt in water B. rusting of iron C. melting of ice D. separating a mixture by distillation 40)To what temperature must a gas at 273k be heated in order to double both its volume and pressure? A. 298K B. 546K C. 819K D. 1092K

*JAMB CHEMISTRY PRACTICAL QUESTIONS AND ANSWERS 📝📚🧠🔥🔥* 1)The knowledge of half-life can be used to A. Create an element B. Detect an element C. to combine elements D. Irradiate an element 2)An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the A. law of multiple proportions B. law of chemical proportions C. law of simple proportions D. law of conservation of mass 3)The hydrogen ion concentration of a sample of orange juice is 2.0 X 10−11 moldm−3. What is its pOH? [log102 = 0.3010] A. 3.30 B. 13.00 C. 10.70 D. 11.30 4)2SO2 (g)+ O2 (g) ↔️ 2SO3(g) ΔH = -395.7kJmol−1 In the equation, an increase in temperature will shift the equilibrium position to the A. left and equilibrium constant decreases B. left and equilibrium constant increases C. right and equilibrium constant increases D. right and equilibrium constant decreases 5)The end products of burning a candle in the atmosphere are water and A. carbon (II) oxide B. sulphur (IV) oxide C. carbon (IV) oxide D. sulphur (VI) oxide 6) The collision theory explains reaction rates in terms of A. size of the product B. frequency of collision of the reactants C. size of reactant D. frequency of collision of the products 7)The presence of ammonia gas in a desiccator can exclusively be removed by A. phosphorus (V) oxide B. fused calcium chloride C. calcium oxide D. concentrated tetraoxosulphate (VI) acid 8)Aluminium does not react with either dilute or concentrated trioxonitrate (V) acid because A. it is insoluble in either dilute or concentrated trioxonitrate (V) acid B. it is lower than hydrogen in the electrochemical series C. the reaction with trioxonitrate (V) acid has a light activation energy D. an insoluble oxide is formed on its surface which renders it passive 9)Which of these sources of water may likely contain the least concentration of Ca2+ and Mg2+? A. Spring water B. River water C. Tap water D. Sea water 10)The conductivity of an acid solution depends on the A. amount of ions present and their mobilities B. mobilities of the ions present C. amount of ions present D. temperature of the solution 11)Which of the following metals cannot replace hydrogen from water or steam? A. Sodium B. Magnesium C. Iron D. Copper 12)Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, A. P will form an electrovalent bond with R B. Q will form a covalent bond with S C. R will form an electrovalent bond with S D. Q will form an electrovalent bond with S 13)During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment A. the litmus turns blue but no gas is evolved B. the litmus turns blue and oxygen is evolved C. the litmus turns blue and hydrogen is evolved D. the litmus turns red and oxygen is evolved 14)The derivative of benzene that can be used in making explosives is A. aniline B. xylene C. phenol D. toluene 15)In electrovalency, the oxidation number of the participating metal is always A. decreasing B. increasing C. constant D. neutral 16)The ionic radii of metals are usuall A. greater than their atomic radii B. unaffected by the charge on the ion C. the same as their atomic radii D. less than their atomic radii 17)Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16] A. 16 B. 48 C. 40 D. 12 18)Which of these alloys contains copper? A. solder B. steel C. permallory D. bronze 19)If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density. A. 196 B. 49 C. 106 D. 82 20)Sieving is a technique used to separate mixtures containing solid particles of A. small sizes B. large sizes C. different sizes D. the same size 21)3H2(g)+ N2(g)⇔ 2NH3(g) ; H= -ve In the reaction above, lowering of temperature will A. have no effect on the equilibrium position B. increase the rate of both the forward and reverse reactions equally C. favour the forward reaction D. favour the reverse reaction

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