Advertisements
Advertisements
प्रश्न
Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants?
Advertisements
उत्तर
The oxygen which is dissolved in water is used by animals for breathing and used by plants for breathing and photosynthesis.
APPEARS IN
संबंधित प्रश्न
Very Short Answer Type Question:
What is common between salt and sand?
Materials which can be compressed or cut easily are called _______.
Write whether the given materials are hard or soft.
| Wood | Eraser | Cotton |
| ______ | ______ | ______ |
Sand paper is a good example for smooth materials.
Test the flexibility.
Give one plastic scale and a wooden scale to the students. Ask them to bend. Tabulate their observation (bends, does not bend).
| Plastic Scale | Wooden Scale |
| ______ | ______ |
A notebook has lustre while an eraser does not.
Name some examples for shiny 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 |
Pick one material from the following which is completely soluble in water.
Which of the following materials is not lustrous?
