BECE 2022 Integrated Science Objective Questions and Answers

Solution: Solar cells convert light energy directly into electrical energy.

Solution: Seed formation marks the end of a flowering plant's life cycle.

Solution: Soil texture refers to the relative proportions of sand, silt, and clay.

Solution: Magnetization of iron is a physical change with no new substances formed.

Solution: Weevils commonly infest and damage stored grains.

Solution: The solid is the residue; the liquid that passes through is the filtrate.

Solution: The LED flashes briefly as the capacitor charges, then goes off.

Solution: Magnesium ions (Mg²⁺) contribute to water hardness.

Solution: All listed examples—hydrogen gas, air, and stone—are forms of matter.

Solution: Staking supports the plant, promoting upright growth and easier harvesting.

Solution: Clayey soil actually swells when wet and shrinks when dry.

Solution: Old or worn electrical devices can pose safety hazards and become dangerous.

Solution: Mercury and Venus both orbit closer to the Sun than Earth.

Solution: Pressure at the same depth is equal in all directions; it increases with depth.

Solution: Afforestation (planting trees) helps prevent soil depletion.

Solution: Gravity pulls the mango downward when it detaches from the stem.

Solution: Urea is widely used as a nitrogen fertilizer.

Solution: Energy conservation addresses supply limits, rising demand, and reduces CO₂ emissions.

Solution: A force meter (spring scale) measures weight (force due to gravity).

Solution: The Sun and glow worms emit their own light; the Moon reflects sunlight.

Solution: Pinhole camera images are real, inverted, and smaller than the object.

Solution: Area = length × breadth = 20 m × 15 m = 300 m².

Solution: Low-pressure systems cause air to rise and condense into rain.

Solution: A crow bar is a first-class lever with the fulcrum between effort and load.

Solution: Producers synthesize their own food via photosynthesis.

Solution: Modern periodic law orders elements by increasing atomic number.

Solution: Balanced: 2 H₂ + O₂ → 2 H₂O, coefficient for H₂ is 2.

Solution: The pistil is the female reproductive part of a flower.

Solution: Distillation separates liquids based on different boiling points.

Solution: Losing one electron leaves the ion with a +1 charge.

Solution: Enamel is the hardest, outermost layer of a tooth.

Solution: Astronauts are trained to travel and work in space.

Solution: Mixed cropping involves growing two or more crops simultaneously.

Solution: During a lunar eclipse, Earth is between the Sun and Moon.

Solution: A metre-rule can measure the straight-line distance across a circle.

Solution: Heating increases kinetic energy, reducing intermolecular attractions.

Solution: The plumule develops into the shoot system of a plant.

Solution: The arrow in a transistor symbol indicates the direction of hole flow.

Solution: Protein digestion continues in the small intestine via enzymes.

Solution: Sucrose is a chemical compound made of glucose and fructose.

Solution:

(i) I: Beaker

II: Filter paper (in a funnel)

III: Filtrate

(ii)

(iii) Filtration

(ii) (α) A: Filtration

(β) B: Magnetic separation / magnetization

(iii) Solid - liquid mixture

(iv) Experimental set-up A is used for separating an insoluble solid from a liquid

(v) Iron filings, Powedered chalk

(vi) It holds the setup in possition

(i) Respiratory system

(ii) I: Larynx

II: Trachea

III: Bronchus (or Bronchi)

IV: Lung

(iii) The larynx (voice box) is responsible for producing sound (voice).

(iv) Asthma, Pneumonia, Tuberculosis (Any three from common respiratory diseases)

(i) Rain gauge

(ii) I: Funnel

II: Measuring cylinder

III: Outer casing/collector

(iii) I (Funnel): To collect and direct rainwater into the measuring cylinder.

II (Measuring cylinder): To measure the volume of collected rainwater.

(iv) Rainfall

(v) Provides water for plant growth; Aids in dissolving nutrients in the soil for plant uptake; Helps in the weathering of rocks to form soil; Washes away accumulated salts; Leaching of nutrients (Any three)

(vi) Plow/Plough

(vii) A plow/plough is used to till or turn over the soil. This loosens the soil, improving infiltration and percolation of rainwater, making it more available for plant roots.

(i) I: Cell/Battery

II: Switch

III: Bulb/Lamp

(ii) A: Series

B: Parallel

(iii) A: The bulb (III) will be dimmer.

B: The bulb (III) will be brighter.

(iv) A: In a series arrangement, the total resistance increases, reducing the current flowing through the bulb, thus making it dimmer.

B: In a parallel arrangement, the total resistance decreases, increasing the current flowing through the bulb, thus making it brighter.

Solution:

(a) Solution: Metals

Mostly solid (except mercury)

Lustrous (shiny)

Malleable

Ductile

Good conductors of heat and electricity

High density

High milting or boiling point

Non Metals

Solid, liquid, or gas

Dull (except graphite, iodine)

Brittle

Non-ductile

Poor conductors (except graphite)

Low density

Low

(i) The active region in a transistor is the operating mode where the transistor acts as an amplifier. In this region, the transistor is forward-biased at the base-emitter junction and reverse-biased at the base-collector junction.

(ii) In the active region, a small change in the base current controls a large change in the collector current. This property allows the transistor to amplify electrical signals.

(i) Kwashiorkor, Marasmus, stunted growth, poor wound healing, weakened immune system, edema. (Any two)

(ii) Add Benedict's solution to the sample and heat the mixture in a water bath. If glucose is present, the blue Benedict's solution will change color through green, yellow, orange, to a brick-red precipitate.

(i) Soil resources refer to the components of the soil that are valuable and can be used by humans, particularly for agriculture and supporting ecosystems. This includes the minerals, organic matter, water, and air within the soil.

(ii) Continuous cropping without replenishment, overgrazing, deforestation, bush burning, excessive tillage, monoculture, improper use of fertilizers. (Any two)

Solution:

(a) Solution: Mouth -> Oesophagus -> Stomach -> Small Intestine -> Large Intestine -> Anus

(b) Solution: A balanced ration for poultry should contain carbohydrates (energy), proteins (growth and repair), fats (energy and vitamins), vitamins (various metabolic functions), minerals (bone formation, eggshell formation, etc.), and water.

(i) When magnesium reacts with dilute hydrochloric acid, magnesium chloride and hydrogen gas are formed. Equation: Mg(s) + 2HCl(aq) -> MgCl₂(aq) + H₂(g)

(ii) When potassium reacts with water, potassium hydroxide and hydrogen gas are formed. The reaction is vigorous and produces heat, which can ignite the hydrogen gas. Equation: 2K(s) + 2H₂O(l) -> 2KOH(aq) + H₂(g)

(i) Increase in temperature, change of state (melting, boiling, sublimation), thermal expansion, chemical change (decomposition, reaction). (Any two)

(ii) The purple color of the potassium permanganate crystals will spread throughout the water.

(ii)(α)

(ii)(β) Diffusion

Solution:

(i) Egg, Larva, Pupa, Adult

(ii) Pupa

(b) Solution: Air is regarded as a mixture because it is composed of different gases (like nitrogen, oxygen, argon, carbon dioxide, etc.) that are not chemically bonded together and can be separated by physical means.

(i) A magnetic pole is one of the two regions in a magnet where the magnetic field is strongest. These are called the North pole and the South pole.

(ii) In electric bells, in relays, in loudspeakers, in lifting heavy magnetic materials (electromagnets), in doorbells. (Any two uses of temporary magnets, often electromagnets)

(d) Solution: Allows for easy weeding, facilitates pest and disease control, enables efficient irrigation and fertilizer application, makes harvesting easier, allows for better air circulation and sunlight penetration, helps in calculating plant density. (Any four)

Solution:

(i) Calcium and Phosphorus

(ii) Dental caries (tooth decay), Periodontal disease (gum disease), Gingivitis. (Any two)

(b) Solution: Poor water retention capacity, low nutrient content, poor cation exchange capacity, easily eroded, high infiltration rate leading to leaching of nutrients. (Any three)

(i) Drawing of an atom with a nucleus containing 13 protons (+) and 14 neutrons (n). Electron shells around the nucleus with electrons arranged as 2, 8, 3. Labels for nucleus, protons, neutrons, electrons, and shells. (Visual representation required, but described here).

(ii) The atom has 3 valence electrons in its outermost shell. Its valency is 3.

(i) Hydraulic brakes in vehicles, hydraulic lifts, syringes, artesian wells, siphons, pressure cookers, liquid in a U-tube manometer. (Any three involving fluid pressure)

(ii) Plastic, rubber, wood, glass, ceramic, air. (Any one)

Solution:

(a) Solution: Mixed cropping is the practice of growing two or more crops simultaneously on the same piece of land.

(i) An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, in a fixed proportion.

(ii) Copper and Zinc

(i) Water pollution, harm to aquatic life, spread of waterborne diseases, unpleasant odor, eutrophication, reduction in the availability of clean water. (Any three)

(ii) Chlorophyll absorbs light energy (primarily red and blue wavelengths) from the sun, which is essential for photosynthesis.

(ii)(α)

(ii)(β) Water is a reactant in photosynthesis; it is split during the light-dependent reactions (photolysis) to provide electrons and protons, and oxygen is released as a byproduct. It also helps transport nutrients in the plant.

(i) In physics, work is defined as the transfer of energy that occurs when a force is applied over a distance, and the force has a component in the direction of displacement. It is calculated as the product of the force and the distance moved in the direction of the force.

(ii) Work done = Force × Distance Work done = 20 N × 3.2 m Work done = 64 Joules