Practise General Science MCQs by subtopic. Explore real practice questions, check answers and follow related topics for focused exam revision.
Explore General Science MCQs by subtopic, with 2569 questions across 13 public practice topics. Choose the area you are studying and work through its multiple-choice questions before moving to a mixed revision session.
Build your General Science revision around the topics in your syllabus. Attempt a small set of questions, check the answers and review explanations where available. Keep a list of mistakes so your next session focuses on concepts that still need attention.
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Explanation Plants exchange gases through: Roots : absorb oxygen and release carbon dioxide through small openings called root hairs Stomata (singular: stoma): tiny openings on leaf surfaces that allow for gas exchange (CO2 in, O2 out) Stem : some plants have aerial roots or stem cuticles that allow for gas exchange
Pharynx
Explanation The pharynx (throat) is a shared passage for both the respiratory and digestive systems. The trachea (windpipe) and esophagus both connect to the pharynx: The trachea connects to the pharynx anteriorly (front) and leads to the lungs. The esophagus connects to the pharynx posteriorly (back) and leads to the stomach.
Food
Explanation Preservatives are used to prevent the growth of microorganisms, such as bacteria, yeast, and mold, in food. They help to extend the shelf life of food products and prevent spoilage. Preservatives can be found in meats , dairy products, baked goods, and beverages.
Hydrogen
Explanation Hydrogen is typically the gas that diffuses the fastest because it has the lowest molar mass. Molecular weight of 2.016 g/mol. According to Graham's Law of Diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight. Therefore, hydrogen diffuses the fastest.
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