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Explain why air is considered as a mixture of gases

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Write a note on water vapours.

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Define organisms?

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What are the sources of carbon dioxide and how its level can be maintained in nature.

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Why reactivity of metals increases down the group?

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Name the internal parts of a leaf?

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Write the working of electronic system

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What is advantage of invention of a telescope?

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What would happen if photosynthesis stops?

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What is retina?

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Give the functioning table of eye ?

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Describe the root and shoot system in plants

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Which planets have their own satellites?

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What is the most important part of cell?

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What is the use of semi conductors diodes?

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What do you know about world's largest mixture?

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Explain the structure of ear?

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Give examples of how organisms interact with each other and with non-living parts ofb their enviroment.

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Potential energy changes into kinetic energy when a diver dives.

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Describe some animal tissues.

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