Great! Here's the BECE-style marking scheme/answers to the paper you listed. It’s organized to reflect how WAEC typically expects students to respond—clear, correct, and to the point. --- ✅ BECE INTEGRATED SCIENCE THEORY – SAMPLE ANSWERS / MARKING GUIDE --- QUESTION 1 a. i. Three conditions necessary for germination: Water (moisture) Air (oxygen) Suitable temperature (warmth) ii. Difference between seed and fruit: A seed is the fertilized ovule capable of growing into a new plant. A fruit is the mature ovary of a flower that contains one or more seeds. --- b. Physical change: A change that does not produce a new substance and is usually reversible (e.g. melting ice). Chemical change: A change that produces a new substance and is usually irreversible (e.g. burning paper). --- c. Four properties of water: It is colorless, tasteless, and odorless. It has a boiling point of 100°C and a freezing point of 0°C. It is a universal solvent. It exists in three states: solid, liquid, and gas. --- QUESTION 2 a. Methods of separation: i. Alcohol and water → Distillation ii. Rice from water → Decantation or filtration iii. Iron filings and sand → Magnetic separation --- b. i. Three ways of reducing friction: Lubricating moving parts (using oil or grease) Using wheels or ball bearings Making surfaces smooth ii. Four applications of pressure in liquids: Hydraulic brakes Syringes Water pumps Hydraulic lifts --- c. Two effects of parasites on humans: Cause diseases (e.g. malaria) Lead to weight loss or weakness Two effects of pests on humans: Destroy crops and food Cause skin irritations or infections (e.g. lice) --- d. Four control methods of pests and parasites: Good personal hygiene Use of insecticides or pesticides Proper disposal of waste Use of mosquito nets or protective clothing --- QUESTION 3 a. Food chain: Cassava → Grasshopper → Hen → Man --- b. Parts of the respiratory system and their functions: Nose/Nasal cavity – filters, warms, and moistens air Trachea (windpipe) – passage for air to lungs Bronchi – two tubes that lead air into lungs Lungs – site of gas exchange Diaphragm – helps in breathing by expanding and contracting the chest cavity --- QUESTION 4 a. i. Four importance of food nutrients: Provide energy Help in body growth and repair Strengthen immune system Regulate body processes ii. Difference between fats and oils: Fats are solid at room temperature (e.g. animal fat) Oils are liquid at room temperature (e.g. vegetable oil) 2025 BECE LAST MINUTE TRIALS FOR STINGY STUDENT https://t.me/BECE_2025 Follow the WAEC channel on WhatsApp: https://whatsapp.com/channel/0029VaCkP2wDjiOUlqtkYr2n JOIN HERE WAEC WEBPAGE FOR MORE INFO: t.me/West_african_examination_council _FORWARD OR SHARE WITH YOUR FRIENDS TO FOLLOW THE MAIN CHANNEL🇬🇭🇳🇬🇸🇱🇬🇲🇱🇷_ _*Forward to inform others_* --- b. Three importance of photosynthesis: Produces oxygen for respiration Provides food for plants and animals Helps remove carbon dioxide from the atmosphere --- c. Three effects of indiscriminate sex: Teenage pregnancy Spread of sexually transmitted infections (STIs) School dropout or social rejection --- QUESTION 5 a. Five inherited characteristics: Eye color Blood group Height Skin color Shape of nose or ears --- b. i. Diffusion: Movement of particles from an area of high concentration to low concentration. Osmosis: Movement of water molecules through a semi-permeable membrane from a region of high water concentration to low water concentration. ii. Four ways of preventing tooth decay: Brushing teeth regularly Reducing sugary food intake Visiting the dentist regularly Using fluoride toothpaste --- c. Four ways of caring for the teeth: Brushing twice daily Flossing regularly Eating balanced meals Avoiding excessive sweets --- QUESTION 6 a. Enzyme: A biological substance that speeds up the rate of chemical reactions, especially in digestion. --- b. Digestive enzymes, their secretion sites, and functions: | Enzyme | Site of Secretion | Function | |--------|--------------------|----------| | Salivary amylase | Salivary glands | Breaks starch into maltose | Pepsin | Stomach | Breaks down proteins into peptides | Lipase | Pancreas | Breaks down fats into fatty acids and glycerol | Maltase | Small intestine | Converts maltose into glucose --- c. i. Opaque object: Does not allow light to pass through (e.g. wood) Transparent object: Allows light to pass through clearly (e.g. glass) ii. Three uses of a fuse: Prevents electrical overload Protects electrical appliances Prevents fire caused by short circuits --- Let me know if you'd like: A printable version More questions like this Topic-by-topic quizzes You're doing great—keep going! 💡📘 2025 BECE LAST MINUTE TRIALS FOR STINGY STUDENT https://t.me/BECE_2025 Follow the WAEC channel on WhatsApp: https://whatsapp.com/channel/0029VaCkP2wDjiOUlqtkYr2n JOIN HERE WAEC WEBPAGE FOR MORE INFO: t.me/West_african_examination_council _FORWARD OR SHARE WITH YOUR FRIENDS TO FOLLOW THE MAIN CHANNEL🇬🇭🇳🇬🇸🇱🇬🇲🇱🇷_ _*Forward to inform others_*