Light — Science STD 7 — Question

There are two components of soil one that comes from living thing and other from non-living thing. What are these two components?

You have studied in previous class that food consists of many components. Try to recall and list them.

Sewage contains some organic impurities in it. Name them.

Write word equations for two chemical reactions with the help of materials given in the box.
(Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water)

Which acid is injected into our body by an ant sting that causes pain?

Blood is a fluid connective tissue. Justify.

Give two examples of insectivorous plants.

What is mastication?

Explain the nature of distilled water.

Predict the following change can be reversed or not be reversed. If you are not sure, you may write that down. Why are you not sure about these?
Stitching cloth to a shirt