(5 Points) Which tool should a baker use to remove large clumps from flour before baking?, Sieve or sifter, Magnet, (5 Points) What is the best method for separating small iron nails that fell into dry sand?, Evaporation, Magnetic separation, (15 Points) What happens to human heart rate during intense exercise like sprinting, and why?, It increases to supply oxygenated blood to active muscles faster, It decreases because muscles need less oxygen during exercise, (15 Points) What specific mistake makes a scientific experiment an unfair test?, Repeating the experiment three times to double-check data, Changing two or more independent variables at the same time, (15 Points) To fairly compare Brand A and Brand B when Brand A was tested using 1 sheet and 50 mL water, how should Brand B be tested?, Use 2 sheets of Brand B and pour 100 mL of water, Use 1 sheet of Brand B and pour 50 mL of water, (15 Points) When investigating how water temperature affects sugar dissolving speed, which factors must be kept controlled?, Sugar cube size, water volume, and stirring speed, Water temperature and total dissolving time, (15 Points) In a fair paper towel absorbency experiment, which factor must be kept as a controlled variable?, Brand logo design, Amount of water tested on each sheet, (15 Points) An experimenter tests 3 paper towel brands by pouring equal water on each and measuring what remains. What is the dependent variable?, Amount of water absorbed or remaining, Brand of paper towel used, (15 Points) Why can't filtration separate sugar that has completely dissolved in water?, Dissolved sugar particles pass right through the filter paper pores, Filter paper only attracts metallic substances, (15 Points) Muddy water is left still until mud settles at the bottom, and clear water on top is poured into another container. What technique is this?, Filtration, Decantation, (15 Points) If a chef carefully pours off the upper oil layer from a settled mixture of oil and vinegar, what technique is applied?, Decantation, Sieving, (15 Points) What is the most suitable technique to first separate iron filings from a mixture of sand and wood shavings?, Evaporation, Magnetic separation, (10 Points) What primary role do red blood cells perform in the body?, Fighting off foreign infections, Carrying oxygen to body tissues and returning carbon dioxide, (10 Points) Which blood component forms clots to stop bleeding and repair damaged blood vessels after an injury?, Platelets, Plasma, (10 Points) Which components of blood are responsible for defending the body against bacteria and viruses?, Red blood cells, White blood cells, (10 Points) What is the primary function of the human circulatory system?, To pump and deliver oxygen, nutrients, and waste throughout the body, To break down solid food into small absorbable liquid particles, (10 Points) In an experiment testing which soil type sprouts bean seeds fastest, what is the independent variable?, Amount of sunlight, Type of soil used, (10 Points) What type of variable is deliberately changed or manipulated by the experimenter in a test?, Independent variable, Dependent variable, (10 Points) Which separation technique can quickly isolate whole corn kernels mixed into fine flour?, Magnetism, Sieving, (10 Points) What is the quickest kitchen technique to remove a layer of excess oil floating on top of broth?, Scooping, Winnowing, (10 Points) Which process allows you to separate and recover solid salt dissolved in water?, Decantation, Evaporation, (10 Points) What method of separation uses wind or air currents to blow away light chaff from heavy seeds?, Winnowing, Filtration, (5 Points) What medical condition is diagnosed when blood pressure against arterial walls is consistently higher than normal?, Anemia, Hypertension, (5 Points) What are the upper, receiving chambers of the human heart called?, Atria, Ventricles, (5 Points) Which type of blood vessels transport oxygen-rich blood away from the heart to body tissues?, Veins, Arteries, (5 Points) Which organ functions as the main muscular pump driving blood throughout the human body?, Heart, Lungs, (5 Points) In a scientific experiment, what general term refers to any factor that can change, be measured, or be kept constant?, Variable, Conclusion

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