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प्रश्न
Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants?
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उत्तर
The oxygen which is dissolved in water is used by animals for breathing and used by plants for breathing and photosynthesis.
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संबंधित प्रश्न
Very Short Answer Type Question:
Suggest two bases on which we can group objects.
Find the odd one.
Umbrella, sponge, rain coat, jerkin
Materials which can be compressed or cut easily are called _______.
A piece of wood floats on water.
Oil mixes with water.
Name some examples for shiny materials?
Differentiate hard and soft materials.
Match the substances in Column A with their applications given in Column B.
|
Column A |
Column B |
| (a) oxygen | (i) for making crackers |
| (b) copper | (ii) for disinfecting water |
| (c) sulphur | (iii) all living beings inhale during breathing |
| (d) iron | (iv) for making electric wires |
| (e) chlorine | (v) for making rails |
Some of the following statements are incorrect. Find the incorrect statements and correct them.
- The property of metals by virtue of which they can be drawn into wires is called ductility.
- Metals are good conductors of electricity but poor conductor of heat.
- Articles made up of metals produce ringing sound when struck hard.
- Oxides of non-metals and metals are acidic in nature.
- A less reactive metal displaces a more reactive metal from its salt solution in water.
Pick one material from the following which is completely soluble in water.
