Science Revision Booklet - Year 8 PDF

AL-XUFAD PRIMARY SCHOOL Science Revision Booklet  SCIENCE REVISION BOOKLET – YEAR 8 1 Questions 1 to 27 are about “The plants” 1. The part of the plant that anchors it is called: 1 ma...

AL-XUFAD PRIMARY SCHOOL Science Revision Booklet  SCIENCE REVISION BOOKLET – YEAR 8 1 Questions 1 to 27 are about “The plants” 1. The part of the plant that anchors it is called: 1 mark leave Root Stem Flower 2. The male part of the follower is called: 1 mark Carpel Stamen Pistil Corella 3. When a liquid turns into a gas: 1 mark Evaporation Melting Boiling Condensation 1 mark 4. How seeds can be dispersed? movement Carrying Leaving Grow Total  SCIENCE REVISION BOOKLET – YEAR 8 2 6. Order these events as they happen. Number them 1, 2,3, 4 Water evaporates from 4 marks Evaporation causes more water to be sucked the leaves. up the stem. The stem transports The roots absorb water water to the leaves. from the soil. 7. Write down four things needed by plants to grow. 4 marks 1. _______________________________________________________________________ 2. _______________________________________________________________________ 3. _______________________________________________________________________ 4. _______________________________________________________________________ 8. Based on what you have learned, explain why plants need nutrients. 1 mark _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ 9. When follower get fertilized, the ovule eventually become a new 1 mark Tick one Seed Fruit Plant Total  SCIENCE REVISION BOOKLET – YEAR 8 3 10. complete the sentences: 5 marks 10.1 When pollen (a fine powdery substance produced by a flowering plant) moved from the _____________________________________ of a flower to the ____________________________. 10.2 A method of moving the seeds away from the _________________________ So that the seeds have the best chance of ___________________________. 11. fill in the gaps to complete the sentences below. Use the word bank to help you. 13 marks Pollinators - Petals - food - seeds - sunlight - carbon dioxide air - holds - water - nutrients - leaves - ground - soil Component Job that it does These anchor the plants into the ______________and absorb water and Root nutrients from the ______________. This___________ the plants up and carries __________ and Stem _____________from the soil to the ______________. A trunk is the stem of the tree. These makes ____________ for plant using __________and Leaf ____________from the _____________. These make _________ to grow into a new plant. Their _________ Flower attract the ___________ to the plants. Total  SCIENCE REVISION BOOKLET – YEAR 8 4 12. Put these life cycle of flowering plants in a correct order. 5 marks Germination Growing and flowering Seed dispersal Fertilization and seed Pollination formation 1. ________________________ 3. _______________________ 5._________________________ 2. ________________________ 4. _______________________ 13. Match these terms with their definitions. 4 marks When male and female parts of the Pollinators flower have mixed in order to make seeds for new plants. The brightly colored part of the flower Stamen that attracts insects to pollinate the plant. The male parts of the follower. the stamen is made up of the anther and filament. The filament’s job is to hold up the anther. Petals The job of the anther to is to make the pollen. Animals or insects which carry pollen between plants. Example include, birds, bees and bats. Fertilization Total  SCIENCE REVISION BOOKLET- YEAR 8 5 14. write down the functions of each of the following: 5 marks a: Stigma: ____________________________________________________________ b: Style: ______________________________________________________________ c: Ovary: _____________________________________________________________ d: anther: _____________________________________________________________ e: filament: ____________________________________________________________ 15. What is photosynthesis? 1 mark ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________ 16. Where does photosynthesis take place? 1 mark ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________ 17. What function does chlorophyll serve in plants? 1 mark ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________ Total  SCIENCE REVISION BOOKLET – YEAR 8 6 18. How does photosynthesis work? ___________________________________________________________________ 1 mark ___________________________________________________________________ __________________________________________________________________ 19. Where do plants get energy? 1 mark ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________ 20. Match each word to its explanation. 4 marks The more light there is, the faster the rate of Carbon dioxide photosynthesis. Too little water makes photosynthesis slow Temperature down. 300C up to about 400C. Beyond 400C, it slows Water down quickly. Increase in carbon dioxide, increases the rate Light of photosynthesis. Total  SCIENCE REVISION BOOKLET – YEAR 8 7 21. What are the four factors needed for optimum photosynthesis to take place? 1. __________________________________________________________________ 4 marks 2. __________________________________________________________________ 3. __________________________________________________________________ 4. __________________________________________________________________ 22. In this equation, write the representation of these chemical symbols. 4 marks 6CO2 6H2O Light energy C6H12O6 6O2 1. CO2: __________________________________________________________________ 2. H2O: ____________________________________________ 3. C6H12O6: _________________________________________ 4. O2: _____________________________________________ 4 marks 23. List four different types of organisms that can photosynthesize? 1. __________________________________________________________________ 2. __________________________________________________________________ 3. __________________________________________________________________ 4. __________________________________________________________________ Total  SCIENCE REVISION BOOKLET – YEAR 8 8 24. Label the parts of the plant on the diagram provided. Us the words in the bank. 5 marks flower leaf bean stem root s 1 mark 25. What is the primary purpose of photosynthesis in plants? TICK ONE BOX To absorb water To make food(glucose) To produce oxygen To absorb sunlight 26. In which part of the plant does photosynthesis mainly take place? TICK ONE BOX 1 mark Stem Leaves Roots flowers Total  SCIENCE REVISION BOOKLET – YEAR 8 9 27. Label the part of the flower using the words in the bank below. 14 marks Stamen Petal Anther Stigma sepal Roots Stem Receptacle Style Filament Ovary Leaf Carpel Ovule Pollen Total  SCIENCE REVISION BOOKLET – YEAR 8 10 Questions 1 to 32 are about ‘‘Health Education’’ 1 mark Tick the correct option to complete each sentence below. 1. which bacterium causes gonorrhea? Escherichia coli Treponema pallidum Neisseria gonorrhea Staphylococcus aureus 2.How is syphilis primarily transmitted? 1 mark Through contaminated water Through insect bite Through sexual contact Trough air 3.The Acronym STD stands for: 1 mark Sexually transmitted diseases Simple transmitted diseases Skin transmitted disorders Systemic toxic diseases 1 mark 4.Which of these is a symptom of gonorrhea? Frequent and painful urination Headache Chest pain Sore throat Total  SCIENCE REVISION BOOKLET – YEAR 8 11 5.HIV/AIDS affects which system of the body? 1 mark Immune system Digestive system Nervous system Skeletal system 6. The virus responsible for AIDS is: 1 mark Hepatitis B Influenza HIV Herpes 1 mark 7. The immune cells targeted by HIV are: Red blood cells Platelets White blood cells Neurons 1 mark 8.Which of the following methods can reduce the risk of contracting HIV? Abstaining from sharing needles Regular exercises Consuming a healthy diet Vaccination against HIV Total  SCIENCE REVISION BOOKLET – YEAR 8 12 9.Which organ is primarily affected by long-term alcohol abuse? Brain 1 mark Heart Kidneys Liver 10.What is a common effect of smoking on the respiratory system? 1 mark Improved lung function Reduced risk of infections Decreased oxygen absorption Faster breathing rate 11.What is the primary purpose of antibiotics? 1 mark Relieve pain Reduce fever Kill or inhabit bacteria Promote sleep 12.What is the term for the misuse of a substance to achieve a non-therapeutic effect? 1 mark Drug abuse Drug tolerance Drug resistance Drug metabolism 13.What is primary health risk associated with glue sniffing? 1 mark Enhanced memory Increased appetite Reduced pain sensation Respiratory damage Total  SCIENCE REVISION BOOKLET – YEAR 8 13 14. The body’s immune system protects against: 1 mark Only bacteria pathogens All diseases Genetic disorders 15. immunization helps the body to: 1 mark Produce red blood cells Fight infections Store energy Digest food 16. The body’s first line of defense against pathogen is: 1 mark Skin and mucous membrane d Red blood cells d White blood cells d Antibodies d 17. How do bacteria reproduce? 1 mark Sexually d Budding Binary fission d Spores d 18. viruses can only replicate: 1 mark In water d In soil d Inside living cells d On surface d Total  SCIENCE REVISION BOOKLET – YEAR 8 14 19. What do bacteria need to grow and reproduce? Protein d 1 mark Sunlight d Moisture and warmth d High salt content d 20. What is the main purpose of vaccines? 1 mark Cure disease d Provide energy D D D Replace antibiotics D d Prevent infections D D 21. Which is NOT a characteristic of a harmful bacteria? 1 mark Producing toxins d Aiding in digestion d Causing diseases d Spreading infections d 22. Which of these practices help prevent infections? 1 mark Sharing personal items d Using contaminated water d Vaccination d Ignoring symptoms d 23. Bacteria can be classified as: 1 mark Never beneficial d Always harmful d Harmful or harmless d Only found in humans d Total  SCIENCE REVISION BOOKLET – YEAR 8 15 24. Which of these is an essential to maintaining good health? Balanced diet d Lack of exercise d 1 mark Alcohol consumption d Stressful lifestyle d 25. Write TRUE or FALSE in the following sentences: 8 marks Gonorrhea and syphilis are both caused by bacteria. Vaccines are only used to treat diseases after someone has been infected. Antibiotics are effective against bacterial infections but not viral infections. HIV/AIDS can weaken the immune system by attacking white blood cells. Drug abuse can lead to physical and psychological dependence. The body’s first line of defense against pathogens includes the skin and mucous membranes. Only illegal drugs can harm the body; prescription drugs are always safe. Good hygiene practices, like regular handwashing, can help prevent the spread of infectious diseases. Total  SCIENCE REVISION BOOKLET – YEAR 8 16 26. What are bacteria? _________________________________________________________________________________ 1 mark _________________________________________________________________________________ 27. How do bacteria reproduce? 1 mark _________________________________________________________________________________ _________________________________________________________________________________ 28. What are viruses? 1 mark _________________________________________________________________________________ _________________________________________________________________________________ 29. How do viruses reproduce inside the body? 1 mark 30. Define drug. 1 mark 31. Define alcoholism. 1 mark 32. Name two health risks associated with smoking. 1 mark Total  SCIENCE REVISION BOOKLET – YEAR 8 17 Questions 1 to 37 are about ‘‘Animals’’ 1. What type of skeletal is present on flatworm? 1 mark Exoskeleton Endoskeleton Hydrostatic skeleton None 2. The human skeletal is an example of: 1 mark Hydrostatic skeleton exoskeleton Endoskeleton Flexible skeleton 3. Which part of the skeletal protects the brain? 1 mark Vertebrae Ribs Cranium Pelvis 4. Hemopoiesis occurs in: 1 mark Kidneys Red bone marrow Liver Muscles 5. The main function of the axial skeleton is: 1 mark Movement Digestion Support Protection of limbs 6. The backbone or spine is part of which skeleton? 1 mark Appendicular Pelvic Axial Thoracic Total  SCIENCE REVISION BOOKLET – YEAR 8 18 7. Which of the following is a characteristic of living things? 1 mark Inactivity Lack of response to stimuli Reproduction Immobility 8. The primary female reproductive organs are: 1 mark Testes Ovaries Oviduct Uterus 9. In human reproduction, fertilization typically occurs in the: 1 mark Uterus Fallopian tube Vagina Ovary 10. The role of the pelvis in the skeleton is: 1 mark Aid in digestion Support the lungs Protect reproductive organs None of the above 11. The tube that carries urine from the kidney to the bladder is the: 1 mark Urethra Ureter Vagina Fallopian tube 12. Which bone provides structural support for the body? 1 mark Skull Spine Pelvis Ribs Total  SCIENCE REVISION BOOKLET – YEAR 8 19 13. Blood cells are produced in the: Bone marrow Liver 1 mark Brain Stomach 14. The male reproductive cells are called: 1 mark Ova Sperms Eggs Hormones 15. Which organ provides nutrients to the developing fetus? 1 mark Oviduct Ovary Uterus Placenta 16. How long is the average gestation period in humans? 1 mark 28 days 30 weeks 9 weeks 40 weeks 17. What is the function of the urethra in males? 1 mark To transport urine and semen To produce sperm cells To transport urine only To produce hormones 18. What is the purpose of the acrosome in a sperm cell? 1 mark To produce energy To carry genetic material To release enzymes for To protect the nucleus penetrating the egg membrane Total  SCIENCE REVISION BOOKLET – YEAR 8 20 19. During which days of the menstrual cycle does menstruation occur? Day 14 1 mark Days 1-5 Days 5-14 Days 14-28 20. How does smoking during pregnancy affect the baby? 1 mark Increases oxygen supply to Increases risk of high birth the baby weight  Can lead to miscarriage or Reduces the likelihood of premature birth stillbirth 21. Which adaptation of the sperm cell helps it move toward the egg? 1 mark Head with enzymes Flagellum (tail) Large cytoplasm Thick cell wall 22. How many chromosomes are present in a human sperm or egg cell? 1 mark 23 chromosomes 22 chromosomes 46 chromosomes 44 chromosomes 23. During pregnancy, which part of the uterus lining is rich in blood and ready for implantation? 1 mark Endometrium Cervix Vagina Oviduct 24. The term "zygote" refers to: 1 mark An unfertilized egg A mature sperm cell A fertilized egg cell A stage of the menstrual cycle Total  SCIENCE REVISION BOOKLET – YEAR 8 21 25. Where are sperm cells produced? Scrotum Ovaries 1 mark Testes Urethra 26.At which week does a foetus have fingerprints? 1 mark 4 weeks 20-24 weeks 8 weeks 37-40 weeks 27. What is the function of the placenta? 1 mark To produce sperm To transfer oxygen and nutrients from mother to foetus To release hormones To protect the embryo from infection 28. Read the statement below and write the letters in the boxes to show the correct sequence 4 marks of events. A. The fertilized egg moves along the oviduct into the uterus. B. A single sperm penetrates the egg cell and two nuclei fuse. C. sperm travels through the female reproductive system towards the egg cell. D. The fused cells embed into the lining of the uterus and develop into an embryo. Total  SCIENCE REVISION BOOKLET – YEAR 8 22 29. Give three symptoms that a person may experience prior to menstruation. 1. ___________________________________________________________ 1 mark 2. ___________________________________________________________ 3. ___________________________________________________________ 30. label the parts of the skeletal system. Use the word bank to help you. Mandible Sternum Thoracic Cage Radius Ulna Carpel Femur Patella Tibia Fibula Cranium Cervical 19 mark Vertebrae Clavicle Humerus Vertebral Column Pelvis Phalanges Talus Metatarsals Total  SCIENCE REVISION BOOKLET – YEAR 8 23 31. The diagram below represents the days in a typical menstrual cycle. 27 28 1 2 26 3 25 4 24 5 23 6 22 7 21 8 20 9 19 10 18 11 17 12 16 15 14 13 A. On the diagram above, shade the days in the cycle when menstruation typically occurs. 1 mark B. On the diagram above, label the day on which ovulation typically occurs. 1 mark 32. Draw one line from each part of the skeletal system to the correct description. Endoskeleton Animals with no skeleton like flatworms and roundworms. 3 marks Exoskeleton Animals with outside skeleton like tortoise, spiders and insects. Hydrostatic skeleton Animals with backbone like birds, mammals and amphibians. Total  SCIENCE REVISION BOOKLET – YEAR 8 24 33. Label the parts of the sperm cell. 3 marks 34. Label the organs of the female reproductive system. Use words from the box below 4 marks Ovary Oviduct Uterus Vagina 35. ovulation typically occurs on day 14 of the menstrual cycle. Describe what happens during ovulation. 1 mark ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ 1 mark 36. What is the role of acrosome in sperm cells? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ Total  SCIENCE REVISION BOOKLET – YEAR 8 25 37. The illustrations below show the journey of the sperm leading up to fertilization. Underneath each picture, write a description of what is happening at each stage. 6 marks 1 2 3 4 5 6 Total  SCIENCE REVISION BOOKLET – YEAR 8 26 Questions 1 to 20 are about ‘‘Environment’’ Tick the correct option to complete each sentence below. 1. What is one major reason for conserving trees in the environment? 1 mark To reduce the oxygen level in the air To control soil erosion by binding soil particles  To increase soil erosion To allow direct sunlight on soil for better plant growth 2. Trees play a role in water conservation by: 1 mark Releasing carbon dioxide into the atmosphere Absorbing moisture without transpiration Increasing water evaporation Reducing water evaporation from the soil 3. Which of these is a method used to conserve water? 1 mark Burning vegetation Cutting down trees Building terraces Increasing cement roads 4. What is the primary source of energy for green plants? 1 mark Water Carbon dioxide Sunlight Soil nutrients 5. Which of the following is NOT a benefit of planting trees? 1 mark Prevention of soil erosion Reduction of wind erosion Habitat destruction for wildlife Recycling moisture through transpiration Total  SCIENCE REVISION BOOKLET – YEAR 8 27 6. Why is water conservation important in the environment? It reduces plant growth. It helps sustain life and reduces drought 1 mark impacts. It causes soil erosion. It makes soil infertile. 7. Rainwater can be conserved by: Using polyethene sheets in Releasing pollutants into water 1 mark small dams bodies. Clearing vegetation around water bodies Encouraging evaporation from reservoirs 1 mark 8. Which of the following practices helps prevent water pollution? Dumping waste near water Using unfiltered water sources sources Planting trees and vegetation Constructing roads near rivers 9. Which process releases oxygen into the environment? 1 mark Photosynthesis Respiration Soil erosion Deforestation 10. Trees help regulate temperature by: 1 mark Preventing water absorption Reflecting sunlight and providing shade Increasing air pollution Enhancing direct sunlight exposure on soil Total  SCIENCE REVISION BOOKLET – YEAR 8 28 11. A primary purpose of afforestation is: Deforestation in specific areas Improving air quality 1 mark Building water reservoirs Allowing for increased construction 12. Water conservation is crucial because water: 1 mark Is always abundant in all Is needed for all chemical regions reactions in living organisms Evaporates easily without Cannot be reused after plants consumption 13. Planting grasses and shrubs on riverbanks helps: 1 mark Increase soil erosion Increase atmospheric carbon dioxide Prevent flooding Raise soil temperature 14. Which of the following is NOT a benefit of trees to wildlife? 1 mark Provide shelter Increase water pollution Release oxygen Produce food sources 15. Terracing the hills is a method of: 1 mark Creating flat land for building Conserving water in agriculture Increasing erosion rates Total Promoting soil erosion  SCIENCE REVISION BOOKLET – YEAR 8 29 16. Which is a consequence of deforestation? Improved soil fertility Reduced water evaporation 1 mark Higher atmospheric carbon Increased biodiversity dioxide 17. The process by which plants release water vapor into the atmosphere is called: 1 mark Photosynthesis Evaporation Transpiration Respiration 18. An efficient way to conserve water at home is: 1 mark Boiling it regularly Increasing garden watering Storing it in cement or metal Avoiding the use of rainwater tanks 19. What type of environment conservation method includes building small dams? 1 mark Air pollution control Water conservation Soil contamination Fossil fuel production 1 mark 20. Trees help regulate soil moisture by: Binding soil with roots and Increasing water evaporation preventing runoff Blocking all rain from reaching Increasing sunlight exposure Total soil on the ground  SCIENCE REVISION BOOKLET – YEAR 8 30 Questions 1 to 38 are about ‘‘Agriculture’’ Tick the correct option to complete each sentence below. 1. What type of poultry is reared primarily for meat production? 1 mark Layer Bantam Broiler Pigeon 2. The main purpose of poultry housing is to: 1 mark Allow chickens to fly freely Increase egg production only Provide security and proper Reduce feeding costs conditions 3. What should a good poultry house avoid? 1 mark Leakage Accessible feeding areas Proper ventilation High humidity 4. Which of the following is a benefit of the free-range poultry system? 1 mark Requires minimal space Protects against disease Reduces feeding costs Limits access to natural food sources 5. Broilers are mainly reared for: 1 mark Meat production Companionship Egg production Pest control Total  SCIENCE REVISION BOOKLET – YEAR 8 31 6. Layers are typically reared for: Feather production Meat production 1 mark Egg production All of the above 7. Which poultry rearing system is characterized by individual or group cages? 1 mark Free-range Battery system Deep litter Pasture-based 8. Which of the following should be provided in a poultry house to prevent cannibalism? 1 mark Large windows Comfortable nesting boxes Enough feeding space Thick walls 9. In which rearing system do chickens have unrestricted outdoor access? 1 mark Battery system Deep litter system Free-range system Incubation system 10. Which of the following is a disadvantage of the battery system? 1 mark High space requirement High initial investment cost Increased disease risk Low egg production Total  SCIENCE REVISION BOOKLET – YEAR 8 32 11. Which material is best for building poultry houses to prevent predators from entering? Wood Metal mesh 1 mark Plastic Cardboard 12. The temperature inside a poultry house should be: 1 mark Extremely cold Hot and humid Warm but well-ventilated Left unregulated  13. Which system helps keep eggs clean and reduces waste contamination? 1 mark Deep litter system Free-range system Battery system Pasture-based system 14. Which of the following birds is not commonly classified under poultry? 1 mark Chicken Eagle Duck Turkey 15. The term “artificial incubation” in poultry refers to: 1 mark A hen sitting on the eggs until Leaving eggs in the sun they hatch Using an incubator to hatch eggs Keeping eggs in a cool room Total  SCIENCE REVISION BOOKLET – YEAR 8 33 16. The main difference between broilers and layers is that: Broilers are reared for meat, layers for Broilers produce more eggs than 1 mark eggs layers Layers are larger in size than Layers are male, broilers are broilers female 17. Which of the following is not a characteristic of a good poultry house? 1 mark Well-ventilated Protected from wind Located near busy roads Prevents entry of vermin 18. What is the purpose of providing adequate space per bird in poultry housing? 1 mark To increase egg production To improve feather quality To reduce disease spread To enhance feed efficiency 19. Which method of chicken rearing involves the birds being allowed to roam freely? 1 mark Battery system Free-range system Deep litter system Layering system 20. Which type of incubation involves using natural warmth from the mother hen? 1 mark Artificial incubation Layer incubation Broiler incubation Natural incubation Total  SCIENCE REVISION BOOKLET – YEAR 8 34 21. Which of the following is an advantage of the battery system for poultry? Low initial investment Birds have more space to roam 1 mark Easy to keep records of No need for special feeding individual birds 22. In natural incubation, a broody hen is characterized by: 1 mark High egg production Laying eggs daily Staying in the nest longer than Aggression towards other hens usual 23. What is a major disadvantage of the free-range poultry system? 1 mark Requires high capital investment Large land area is needed Birds are confined to small It encourages cannibalism spaces among birds 24. Write down four attributes of a good poultry housing? 4 marks 1. ____________________________________________________________ 2. ____________________________________________________________ 3. ____________________________________________________________ 4. ____________________________________________________________ 25. In artificial incubation, eggs are placed in special machine called incubator. 1 mark True False Total  SCIENCE REVISION BOOKLET – YEAR 8 35 26. Name three methods of chicken rearing. 1. 3 marks ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 27. Write down two advantages of deep litter system. 1 mark 1. ________________________________________________________________ 2. ________________________________________________________________ 28. Write down three advantages of free-range system? 2 mark 1. ________________________________________________________________ 2. ________________________________________________________________ 29. Write down four disadvantages of free-range system? 4 marks 1. ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 4. 30. Write down two advantages of deep litter system? ________________________________________________________________ 2 marks 1. ________________________________________________________________ 2. ________________________________________________________________ 31. Write down three disadvantages of deep litter system? 2 marks 1. ________________________________________________________________ 2. ________________________________________________________________ 3. Total ________________________________________________________________  SCIENCE REVISION BOOKLET – YEAR 8 36 32. Write down four advantages of battery cage system? 1. 4 marks ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 4. down three disadvantages of battery cage system? 33. Write ________________________________________________________________ 1. 4 marks ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 4. is the broody hen? 33. What 1 mark ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ 34. List down six characteristics of broody hen? 1. 6 marks ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 4. ________________________________________________________________ 5. is the artificial incubation? 1 mark 35. What ________________________________________________________________ ________________________________________________________________ 6. ________________________________________________________________ ________________________________________________________________ Total  SCIENCE REVISION BOOKLET – YEAR 8 37 36. What is the natural incubation? ________________________________________________________________ 1 mark ________________________________________________________________ 37. Write down three conditions of natural incubation? 3 mark 1. ________________________________________________________________ 2. ________________________________________________________________ 3. ________________________________________________________________ 38. Write down the causes of the following diseases: 3 mark Coccidiosis: _______________________________________________________ Newcastle: ________________________________________________________ Typhoid: __________________________________________________________ 38. Draw lines to match the words to their definitions. 4 marks Any substance that alters Natural incubation the way the body works. Chickens reared for eggs Broilers productions purposes. Layers Chickens reared for meat production purposes. Broody hen A broody hen sits on the eggs until they hatch into chicks. Total  SCIENCE REVISION BOOKLET – YEAR 8 38 Questions 1 to 24 are about ‘‘Light’’ Tick the correct option to complete each sentence below. 1. What is the function of the eyelid? 1 mark It carries signals to the brain It protects the eye and spreads tears to keep it moist. It helps focus the light on the It allows light to enter the eye. retina. 2. The pupil is responsible for: 1 mark Draining tears from the eye Giving the eye its color Allowing light to enter the eye Focusing on distant objects 3. Which part of the eye is known as the "white part"? 1 mark Iris Cornea Retina Sclera 4. The optic nerve: 1 mark produces tears Carries signals from the eye to the brain Changes light waves into electrical signals Controls the thickness of the lens 1 mark 5. The iris: Is the colored part of the eye Helps drain tears Allows light to enter the eye Protects the eye from dust Total  SCIENCE REVISION BOOKLET – YEAR 8 39 6. Which part of the eye adjusts the thickness of the lens? Iris Retina 1 mark Ciliary muscle Optic nerve 1 mark 7. The cornea covers which part of the eye? The lens and retina The iris and pupil The sclera and optic nerve The vitreous jelly 8. What is the main function of the retina? 1 mark To carry signals to the brain To change light waves into electrical signals. To control the thickness of the To drain tears from the eye lens 9. Which of the following is filled with a clear substance to support the shape of the eye? 1 mark Vitreous jelly Optic nerve Lacrimal duct Anterior chamber 10. The lens: 1 mark Carries electrical signals to the Helps focus on objects by brain adjusting thickness Protects the eye from foreign objects Vitreous jelly 11. What happens to the pupil in dim light? 1 mark It becomes smaller It closes completely It remains the same It becomes larger Total  SCIENCE REVISION BOOKLET – YEAR 8 40 12. Short-sightedness (myopia) causes difficulty in seeing: Near objects Moving objects 1 mark Distant objects Colors 13. The retina in the human eye is similar to which part of a camera? 1 mark Lens Film Shutter Diaphragm 14. Long-sightedness (hypermetropia) affects the ability to see: 1 mark Distant objects clearly Colors accurately Near objects clearly Moving objects clearly 15. Which eye condition can be corrected by using a convex lens? 1 mark Short-sightedness Color blindness Long-sightedness Astigmatism 1 mark 16. How does the eye respond to bright light? Pupil enlarges Lens becomes more curved Pupil contracts Retina thickens 1 mark 17. Which of the following does NOT help in eye care? Good hygiene Staring at bright screens for long periods Regular eye check-ups Good nutrition Total  SCIENCE REVISION BOOKLET – YEAR 8 41 18. Match each eye part with its correct function: 5 marks Carries electrical signals to the Iris brain. Retina Changes light waves into electrical signals. Optic nerve Controls the amount of light entering the eye. Cornea Adjusts the thickness of the lens for focusing. Ciliary muscle Covers and protects the iris and pupil. 19. Draw arrows on the diagram to show how the person sees the apple. 1 mark Total  SCIENCE REVISION BOOKLET – YEAR 8 42 20. Label the parts of the eye on the diagram using the words from the box. 7 marks Blood vessels cornea iris lens optic nerve retina sclera 1 mark 21. Describe the function of the lens. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 22. Why does the image appear upside down in a simple camera? 2 marks ____________________________________________________________________ Total ____________________________________________________________________ ____________________________________________________________________  SCIENCE REVISION BOOKLET – YEAR 8 43 23. State two ways that the human eye and a simple camera are similar. ____________________________________________________________________ 1 mark ____________________________________________________________________ ____________________________________________________________________ 24. Match each part with its correct description. Tongue Detects light stimuli 5 marks Skin Detects sound stimuli Nose Detects smell stimuli Ear Detects touch stimuli Eye Detects taste stimuli Total