Force and Pressure — Science STD 8 — Question

Fill in the following blanks with suitable words:
Fusion of gametes gives rise to a single cell called ______________.

Why is the surface of a slide polished to make it smooth?

Name any two types of chemicals used in agriculture which cause water pollution.

What is acne?

In which age, maximum increase in height takes places?

Which cells transmit message between the brain and other parts of the body?

Some of the following statement are incorrect. Find the incorrect statement and correct them. Oxides of non-metals and metals are acidic in nature.

Find out the wrong statements and write them in their correct form.
Chlorination is a commonly used chemical method for killing germs in water.

How does a sound making object differ from one that is silent?

Name the petroleum product commonly used for electric generators.