📘 Study MCQs Q1. The primary function of red blood cells is to: A. Fight infection B. Transport oxygen C. Clot blood D. Produce antibodies AnswerB. Transport oxygenDetails CloseRed blood cells contain a special protein called hemoglobin, which binds to oxygen in the lungs. As blood circulates, hemoglobin releases this oxygen to all the cells […]
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Q1. Photosynthesis occurs only during the daytime. True False Q2. All metals are good conductors of electricity. True False Q3. The human heart has four chambers. True False Q4. Sound can travel through a vacuum. True False Q5. The boiling point of water decreases at higher altitudes. True False Q6. Plants absorb oxygen during photosynthesis.
Q1. Photosynthesis occurs only during the daytime. True False Details Photosynthesis requires sunlight as a source of energy to convert carbon dioxide and water into glucose and oxygen. Since sunlight is available only during the day, the light-dependent reactions of photosynthesis occur during daytime. However, some processes like the Calvin cycle can continue briefly in
Q1. Photosynthesis occurs only during the daytime. True False Details Photosynthesis requires sunlight as a source of energy to convert carbon dioxide and water into glucose and oxygen. Since sunlight is available only during the day, the light-dependent reactions of photosynthesis occur during daytime. However, some processes like the Calvin cycle can continue briefly in
📘 Study MCQs Q1. Why does your nose sometimes “run” when you go outside on a very cold morning? A. Because the cold air freezes the mucus B. Because the nasal cavity produces extra mucus to warm and moisten the very cold, dry air C. Because the nose is trying to sneeze D. Because the
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📘 Study MCQs Q1. What is the first part of the human respiratory system that air enters through the nose? A. Trachea B. Nasal cavity C. Bronchi D. Alveoli AnswerB. Nasal cavityDetails When you breathe in through your nose, air first enters the nasal cavity. This is the hollow space behind your nostrils. It is
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📘 Study MCQs Q1. Why do living organisms respire? A. To produce food B. To release energy from food C. To absorb carbon dioxide D. To digest nutrients AnswerB. To release energy from foodDetails Respiration is a vital process because it breaks down food molecules like glucose to release energy. This energy is needed for
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📘 Study MCQs Q1. Why do dogs stick their tongue out and pant on a hot day? A. To make a loud sound B. To cool down their body C. To taste the air D. To show they are angry AnswerB. To cool down their bodyDetails Dogs do not sweat much; they release heat by
📘 Study MCQs Q1. The slow process in which iron reacts with oxygen and moisture from the air to form a reddish-brown substance is called: A. Galvanisation B. Rusting C. Crystallisation D. Alloy formation AnswerB. RustingDetails Rusting is a chemical change that occurs only in iron and its alloys (like steel). When iron comes in
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📘 Study MCQs Q1. The process in which a substance undergoes a change in its physical properties without forming a new substance is called: A. Chemical change B. Physical change C. Rusting D. Burning AnswerB. Physical changeDetails A physical change affects only the physical properties of a substance, such as shape, size, colour, or state
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