Summary

• Description:

  Download a printable Grade 9 Integrated Science Revision Topical Questions and Answers Booklet in PDF document format.

  This revision resource provides a comprehensive compilation of topical revision questions designed to align with the Competence Based Curriculum (CBC) and prepare learners thoroughly for the Kenya Junior School Education Assessment (KJSEA). The booklet covers all prescribed core strands in Grade 9 Integrated Science, incorporating extensive multiple-choice questions, structured theoretical questions, and hands-on laboratory practical assessment tasks. The booklet presents the topical revision questions, while the corresponding answers are provided in a separate document. This arrangement allows learners to attempt the questions independently before consulting the answers for checking, marking, feedback, and self-assessment.

  The booklet is organized logically into the following scientific strands and sub-strands:

  • Strand 1.0: Mixtures, Elements and Compounds
    • Sub-strand 1.1: Structure of the Atom: Contains 70 multiple-choice questions, Section B Structured Questions consisting of 8 analytical problems (totaling 100 marks), and Section C Practical Questions with 2 experimental scenarios (40 marks). The content focuses on the identification, relative masses, and charges of subatomic particles (protons, neutrons, and electrons), calculating atomic number ($Z$) and mass number ($A$), drawing Bohr electron configurations for the first 20 elements (such as sodium, chlorine, calcium, and neon), valence electrons and valency determination, isotopes (carbon-12 and carbon-14), physical and chemical differentiation of metals and non-metals, and hands-on modeling of atoms using clay, plasticine, and toothpicks.
    • Sub-strand 1.2: Metals and Alloys: Contains 30 multiple-choice questions, Section B Structured Questions consisting of 5 multi-part problems (totaling 50 marks), and Section C Practical Questions with 2 laboratory tasks (40 marks). Concepts assessed include physical properties of metals (malleability, ductility, electrical conductivity, thermal conductivity, and luster), liquid metal exceptions (mercury), composition and applications of common alloys (steel, bronze, brass, and duralumin), industrial uses of sodium, gold, iron, and copper, conditions necessary for rusting of iron (oxygen and water), and anti-corrosion techniques including painting, oiling, galvanizing, sacrificial protection, and alloying.
    • Sub-strand 1.3: Water Hardness: Contains 30 multiple-choice questions, Section B Structured Questions consisting of 5 detailed questions (totaling 50 marks), and Section C Practical Tasks with 2 investigations (40 marks). Areas tested include the physical properties of pure water (boiling point at sea level, color, taste, and odor), distinguishing between soft and hard water based on lathering ability with soap and scum formation, dissolved mineral salts responsible for hardness (calcium and magnesium bicarbonates and sulfates), chemical methods of softening water (boiling, addition of washing soda/sodium carbonate, and distillation), boiler scale formation in pipes and kettles, and comparative laboratory procedures for evaluating lathering volume.
  • Strand 2.0: Living Things and Their Environment
    • Sub-strand 2.1: Nutrition in Plants: Contains 50 multiple-choice questions, Section B Structured Questions consisting of 5 comprehensive items (totaling 50 marks), and Section C Practical Questions with 2 experimental investigations (40 marks). Core topics include internal and external leaf anatomy (cuticle, palisade mesophyll, spongy mesophyll with intercellular air spaces, stomata, and guard cells), chloroplast ultrastructure (grana, thylakoids, and stroma), chlorophyll light absorption, the overall word equation for photosynthesis, light-dependent photolysis versus light-independent dark reactions, starch testing protocols, and laboratory investigations demonstrating the necessity of light, chlorophyll, and carbon dioxide using destarched potted plants and potassium hydroxide.
    • Sub-strand 2.2: Nutrition in Animals: Contains 60 multiple-choice questions, Section B Structured Questions consisting of 9 extensive questions (totaling 50 marks), and Section C Practical Questions with 2 observational and modeling tasks (40 marks). Concepts examined include modes of nutrition (holozoic, saprophytic, parasitic, and symbiotic), mammalian dentition types (homodont versus heterodont), structural adaptations of human teeth (incisors, canines, premolars, and molars), dental formulas for adult humans and herbivores, carnassial teeth, the diastema and horny pad in ruminants, the five sequential digestive stages (ingestion, digestion, absorption, assimilation, and egestion), alimentary canal anatomy, and digestive enzyme functions.
    • Sub-strand 2.3: Reproduction in Plants: Contains 52 multiple-choice questions, Section B Structured Questions consisting of 9 structured problems (totaling 50 marks), and Section C Practical Investigations with 2 flower dissection and seed classification tasks (40 marks). Areas covered include floral morphology (petals, sepals, stamen/anther/filament, pistil/stigma/style/ovary), distinguishing between self-pollination and cross-pollination, structural adaptations of insect-pollinated versus wind-pollinated flowers, pollen tube growth and fertilization, post-fertilization changes (ovary developing into fruit, ovule into seed, zygote into embryo), and seed dispersal adaptations (wind, water, animal, and explosive mechanisms).
    • Sub-strand 2.4: The Interdependence of Life: Contains 42 multiple-choice questions, Section B Structured Questions consisting of 6 ecological problems (totaling 50 marks), and Section C Practical Questions with 2 field study designs (40 marks). Content covers biotic factors and interrelationships (predation, interspecific and intraspecific competition, mutualism, commensalism, and parasitism), abiotic environmental influences (light intensity, temperature, moisture, wind, and pH), constructing food chains, food webs, and trophic levels, energy flow dynamics, decomposer functions, and the impact of human activities (deforestation, poaching, and habitat fragmentation) on biodiversity.
  • Strand 3.0: Force and Energy
    • Sub-strand 3.1: Curved Mirrors: Contains 60 multiple-choice questions, Section B Structured Questions consisting of 28 computational and ray-diagram tasks (totaling 50 marks), and Section C Practical Experiments with 4 hands-on focal length and optical setups (40 marks). Content includes spherical mirror terminology (pole $P$, principal axis, center of curvature $C$, principal focus $F$, radius of curvature $R$, and focal length $f$ where $R = 2f$), ray diagram constructions for concave and convex mirrors across various object positions, image characteristics (real, virtual, inverted, upright, magnified, diminished), mirror equations and linear magnification ($m = v/u$), practical uses (dentist mirrors, shaving mirrors, vehicle rear-view mirrors, security mirrors, solar concentrators, and headlamp reflectors), and laboratory focal length determination using distant object focusing and optical bench parallax techniques.
    • Sub-strand 3.2: Waves: Contains 40 multiple-choice questions, Section B Structured Questions consisting of 26 computational and theoretical questions (totaling 50 marks), and Section C Practical Questions with 4 experimental investigations (40 marks). Concepts evaluated include wave classification into mechanical and electromagnetic waves, transverse waves (crests, troughs, and perpendicular particle vibration) versus longitudinal waves (compressions, rarefactions, and parallel vibration), wave parameters (amplitude, wavelength $\lambda$, frequency $f$, and periodic time $T$), the wave speed equation ($v = f\lambda$), wave phenomena (reflection, refraction, and diffraction), and technological applications (remote sensing, ultrasound fetal imaging, diagnostic X-rays, CT and MRI scans, laser surgery, radio/TV broadcasting, Wi-Fi networks, and microwave heating).

  The assessment formats throughout the booklet vary widely, challenging learners to interpret detailed anatomical and physical diagrams, plot and extract values from displacement-time graphs, perform algebraic calculations involving optical formulas and wave equations, sketch biological specimens, and interpret control setups in laboratory experiments. The inclusion of dedicated Section C practical questions provides schools with ready-made experiments, ensuring learners master the scientific inquiry, manipulation, and recording skills assessed in junior secondary school examinations.

  For science teachers, this booklet serves as a rich, standard question bank for topic-by-topic revisions, end-of-strand summative tests, and laboratory preparation. For Grade 9 learners, it offers rigorous practice that develops accurate scientific explanations, numerical calculation competence, and readiness for the KJSEA Integrated Science paper.

• File Size:

  4.94 MB
• Length:

  196 pages
• Category:

  Questions and Answers
• Level:

  Grade 9
• Subject:

  Integrated Science
• Posted By:

  Caleb_Peter

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