Forests: Our Lifeline — Science STD 7 — Question

Do you think that one possibility could be using a turmeric solution for the spraying liquid and a soap solution for writing on the paper?

Fill in the blanks in the following statement: Changes in which only _________ properties of a substance change are called physical changes.

Which gas is released during photosynthesis which is essential for life?

Fill in the blanks: An image formed by a __________ mirror is always of the same size as that of the object.

State whether the following statements are True or False. In case a statement is false, write the correct statement. Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted.

Name the scientist who experimentally demonstrated that plants produce oxygen and purify air.

Mention the use of dried sludge.

What is an aquifer?

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook. Iron and rust are the same substances. (True/ False)

What do you understand by the term "sewerage"?