BECE 2010 Integrated Science Objective Questions and Answers

Solution: Soft water lacks minerals like calcium and magnesium, allowing soap to lather easily. Hard water contains these minerals and forms scum.

Solution: Both plants and animals feed and respire, but locomotion (self-directed movement) is exclusive to animals.

Solution: Vernier calipers provide precise measurements of internal diameters, while beam balances measure mass, and metre rules/surveyor’s tapes lack precision.

Solution: Soil fertility specifically refers to the soil’s capacity to provide essential nutrients for plant growth.

Solution: Boiling removes temporary hardness by precipitating calcium carbonate, improving soap lathering. Alum clarifies but doesn’t soften, chlorination disinfects, and filtering removes solids but not dissolved minerals.

Solution: Leaching involves soluble nutrients being washed downward by water beyond the root zone. Percolation is general water movement, and aeration/infiltration relate to air/water entry into soil.

Solution: An object floats if its density is less than water (I). If density equals water, it suspends (neutral buoyancy); if denser, it sinks.

Solution: Lettuce is a leafy vegetable. Cucumber and okro are fruit-vegetables, and onion is a bulb.

Solution: Alveoli are tiny sacs in the lungs where oxygen and carbon dioxide exchange occurs. Bronchi/trachea/nostrils are airways.

Solution: Glucose oxidation during cellular respiration produces carbon dioxide (carbon (IV) oxide) and water.

Solution: Birds (e.g., fowl) have a crop for temporary food storage. Goats, pigs, and sheep are ruminants with multi-chambered stomachs.

Solution: Wind aids pollination (anemophily) in plants like grasses. Leaching/erosion are harmful, and wind doesn’t directly promote photosynthesis.

Solution: Millon’s reagent tests for tyrosine in proteins, turning red upon heating. Benedict’s/Fehling’s test for sugars, and iodine for starch.

Solution: Bushfires release pollutants (I), destroy plants (II), and emit CO₂ (a greenhouse gas) contributing to global warming (III).

Solution: Terracing creates level steps on slopes, reducing runoff velocity. Cover cropping/mulching/strip cropping are less effective on steep gradients.

Solution: Meteorological Services Department specializes in weather/climate data. Other agencies focus on livestock, agriculture outreach, or public information.

Solution: Monoculture refers to continuous cultivation of a single crop species on the same land. Mono cropping may imply one crop per season but not necessarily recurring.

Solution: Planetary order: Mercury (1), Venus (2), Earth (3), Mars (4), Jupiter (5), Saturn (6), Uranus (7), Neptune (8).

Solution: Fertilization is the fusion of sperm and egg to form a zygote. Ovulation releases the egg, menstruation sheds the uterine lining, and reproduction is the broader process.

Solution: Transpiration is water loss via leaf stomata. Absorption is water uptake by roots, diffusion is passive molecular movement, and osmosis is water diffusion across membranes.

Solution: The deep litter system confines birds indoors with litter bedding (intensive). Fold unit/free range/free-running are extensive systems with outdoor access.

Solution: The symbol is identified as an \( n-p-n \) transistor.

Solution: For an \( n-p-n \) transistor (Q22), the base (labeled I) is \( p \)-type, with holes as majority carriers.

Solution: Oils/lipids create translucent spots on paper (grease-spot test). Glucose/protein/starch do not.

Solution: Per the available options, wood is the answer

Solution: A hutch is a cage for rabbits. Goats/pigs are housed in pens/stalls.

Solution: Pulmonary artery carries deoxygenated blood from the heart to the lungs. Aorta/renal artery carry oxygenated blood; pulmonary vein carries oxygenated blood to the heart.

Solution: When powering lights, the battery converts chemical energy to electrical energy, which is then transformed to light energy.

Solution: Mercury has a high boiling point (357°C) and remains liquid at 150°C. Alcohol (78°C) and water (100°C) boil below 150°C; turpentine (~160°C) is less stable.

Solution: Proteins are broken down into amino acids by proteases. Carbohydrates yield sugars; fats/oils yield fatty acids/glycerol.

Solution: Incisors cut food (e.g., biting). Canines tear, molars/premolars grind.

Solution: Fingerlings (juvenile fish) are hardy and ideal for stocking. Fry/eggs are less resilient; anchovies are a species, not a life stage.

Solution: Burning (combustion) and rusting (oxidation) form new substances. Heating water to steam is a physical change (state change only).

Solution: Resistant breeds leverage biological mechanisms (e.g., genetics) to combat diseases. Chemical/cultural/physical methods involve external interventions.

Solution: Work = Force × Distance = 10 N × 2 m = 20 J.

Solution: Mineral salts (electrolytes) are dissolved in plasma. Phagocytes, platelets, and RBCs are cellular components.

Solution: Neutrons = Mass number (12) – Atomic number (6) = 6.

Solution: Middlemen (e.g., wholesalers, retailers) distribute goods through the supply chain, linking producers to consumers.

Solution:Option B shows field lines emerging from the North pole and entering the South pole externally.

Solution: Sperm are produced in testes; eggs in ovaries. Scrotum holds testes, uterus hosts fetal development, and penis/vagina are copulatory organs.