Science: 7 Cells

Year 7 Science: Cells (Short Answers)1. What are the 7 life processes? (MRS GREN)Movement – moving parts of the bodyRespiration – using food to release energySensitivity – reacting to surroundingsGrowth – getting biggerReproduction – making babies or seedsExcretion – getting rid of wasteNutrition – taking in food2. What are organs made of?Organs are made from different tissues that work together.3. What do these organs do?Lungs – help you breatheHeart – pumps bloodBrain – controls the bodyLiver – cleans the blood and helps digestionStomach – breaks down foodIntestines – absorb foodKidneys – filter blood and make urineBladder – stores urineLeaf – makes food using sunlightFlower – for reproductionRoots – take in waterStem – holds the plant up and moves water4. What is magnification?It means making things look bigger, using a microscope.5. What are the parts of a light microscope?Eyepiece – you look through itObjective lenses – change magnificationStage – where the slide goesMirror or lamp – shines lightFocusing knobs – make the image clear6. What are the main parts of an animal and plant cell and what do they do?Nucleus – controls the cellCytoplasm – jelly where reactions happenCell membrane – controls what goes in and out(Plant cells also have:)Cell wall – supports the cellChloroplasts – where photosynthesis happensVacuole – stores sap7. How can you identify cell parts under a microscope?Look for shapes and labels — use a stained slide to see parts more clearly.8. What’s the difference between plant and animal cells?Plant cells have a cell wall, chloroplasts, and a big vacuole.Animal cells don’t.9. Are all cells the same?No — there are specialised cells for different jobs.10. Examples of specialised cells:Muscle cell – contracts to moveNerve cell – carries messagesSperm cell – has a tail to swimRoot hair cell – takes in water11. How do you use a microscope properly?Start on low power, use coarse focus, then switch to high power and use fine focus.