Why is it important to wash off fruits, grains or vegetable before being consumed?

Why is it essential to wash the precipitate with water before estimating it quantitatively?

Why is maize grain usually called as a fruit and not a seed?

Vitamin C is found in fruits and vegetables. It cannot be stored in our body. Why?

Rekhe observed that her mother placed shrinkled or dried vegetables in water before cutting these for cooking. After sometime, these vegetables looked fresh. Answer the following questions: Why did Rekha's mother place the shrinkled or dried vegetables in water?

When dehydrated fruits and vegetables are placed in water they slowly swell and return to original form why ? What is the effects of temperature on the process ?

When dehydrated fruits and vegetables are placed in water, they slowly swell and return to original form. Why? Would a temperature increase accelerate the process? Explain.

In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explin why they do this.