ANSWER THESE PLEASE :-

Q6.  What is the importance of oxygen gas dissolved in water ? How is the carbon dioxide gas dissolved in water helpful to the plants which live in water?

Q7.  Give two reasons to classify objects.

Q8.  Which material can float on water?

Q.9. Why are cooking utensils made of metals?

6 Dissolved oxygen in water helps animals to perform respiration and dissolved carbon dioxide help plants to perform respiration.

7 lustre and floatation and magnetism

8 Materials having lesser density than water are able to float on water.

9 Cooking utensils are made of metals because they allow heat to pass through them and are good conductors of heat.

hope this helps u 
Poorva

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1    oxygen dissolved in water is required for fishes and aquatic life.

2     we classify objects to simplify their understanding and to facilitate usage.

3    material with density lesser than water can float on water.

4    because metals are malleable and ductile.
 
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