The World of Metals and Non-metals — Science STD 7 — Question

How does the Earth’s tilt lead to the formation of seasons?

What is meant by ‘basicity’ of an acid?

What are decomposers? Explain with example.

Define the term ‘selective breeding’.

Pick the odd-one-out from each of the groups given below on the basis of respiratory organs. Give reason for your answer. Crocodile, whale, dolphin, fish.

Which acid is present in lemon juice?

What do you mean by scouring?

Paridhi and Anusha of Grade 7 started running for their morning workout. After they completed their running, they counted their breaths per minute. Anusha was breating faster than Paridhi. Provide at least two possible explanations for why Anusha was breathing faster than Paridhi.

What kind of soil should be used for making matkas and surahis?

Is cloud formation a physical change or chemical change? Explain.