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Veins have valves that allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
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What is the special feature present in a human heart which does not allow mixing of blood when oxygen-rich and carbon dioxide-rich blood reach the heart?
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Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
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Name the only artery that carries carbon dioxide-rich blood.
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Why is it called an artery if it does not carry oxygen-rich blood?
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Paheli noticed water being pulled up by a motor pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell me why?
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While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after some time.
- Why did the bleeding stop?
- What would be the colour of the wounded area and why?
- Which type of blood cells are responsible for clotting of blood?
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A simple pendulum is oscillating between two points A and B as shown in figure. Is the motion of the bob uniform or non-uniform?
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Given below as figure is the distance-time graph of the motion an object.
- What will be the position of the object at 20s?
- What will be the distance travelled by the object in 12s?
- What is the average speed of the object?
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Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?
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Which property of a conducting wire is utilised in making electric fuse?
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Why are compact fluorescent lamps (CFLs) preferred over electric bulbs?
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Why is an electric fuse required in all electrical appliances?
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Draw the symbols of the following circuit components.
Electric bulb
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Which of the following does not show water shortage?
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Which of the following does not show water shortage?
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On which of the following day is World Water Day observed?
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On which of the following day is World Water Day observed?
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“Every Drop Counts” is a slogan related to
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“Every Drop Counts” is a slogan related to
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