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Give True (T) and False (F)
Funaria is a moss.
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Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do.
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Common cold is ______ disease.
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Classify the following diseases as infectious or non-infectious.
- AIDS
- Tuberculosis
- Cholera
- High blood pressure
- Heart disease
- Pneumonia
- Cancer
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Among the given options, which one is not correct for the use of large amounts of fertilisers and pesticides?
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Total earth’s surface covered by water is
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Rivers from land, add minerals to seawater. Discuss how?
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How is the life of organisms living in water affected when water gets polluted?
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In the coastal areas, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.
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Define Biofertilizer.
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What are the limitations of J.J. Thomson’s model of the atom?
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Why is the cell called the structural and functional unit of life?
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If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
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Where are proteins synthesized inside the cell?
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What is the quantity which is measured by the area occupied below the velocity-time graph?
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Which of the following has more inertia:
- a rubber ball and a stone of the same size?
- a bicycle and a train?
- a five-rupees coin and a one-rupee coin?
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In the following example, try to identify the number of times the velocity of the ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”.
Also identify the agent supplying the force in each case.
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Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
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Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?
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Why is it advised to tie any luggage kept on the roof of a bus with a rope?
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