Acids, Bases and Salts — Science STD 7 — Question

Give names of any four birds which you expect to see in a forest.

What is the purpose of filtering waste water?

Name a substance which is used to cure the discomfort caused by indigestion due to over eating.

What is a chemical change?

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook. Cutting a log of wood into pieces is a chemical change. (True/ False)

Name the respiratory organ of frogs.

Name the process involved in getting fibres form the sheep.

Some plants have deep red, violet or brown leaves. Do these leaves also carry out photosynthesis?

Which organ secretes the juice that helps neutralise the acid?

What kind of image is formed by concave lens?