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How do the roots of land plants get oxygen for breathing?
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Why do traffic assistants wear a mask on duty?
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How do plants and animals maintain the balance of oxygen and carbon dioxide in the air?
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Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off the fire?
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Most organelles in an eukaryotic cell is found in the
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Prokaryotes were the first form of life on earth.
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Match the following
| 1. | Control center | Energy producer |
| 2. | Food producer (Plant cell) | Mitochondria |
| 3. | Gate of the nucleus | Nucleus |
| 4. | Gate of the cell | Chloroplasts |
| 5. | Energy producer | Nuclear membrane |
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Analogy
Prokaryote : Bacteria :: Eukaryote :_______
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Give any three examples of eukaryotic cell?
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Draw a neat labelled diagram of a prokaryotic cell.
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The Materials which are attracted towards the magnet are called ______.
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Paper is not a ______ material.
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Rubber is a magnetic material.
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Circle the odd ones and give reason
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Write down the names of substances.
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The process of changing water into its vapour is called ______.
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______ is built on rivers to regulate water flow and distribute water.
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Take out the cooled bottle of water from the refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?
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To clean the spectacles, people often breathe out on glasses to make them wet. Explain why do the glasses become wet.
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