Write the name and structure of an alcohol with three carbon atoms in its molecule.

What happens when a mature spirogyra filament attains considerable length?

The depletion of ozone layer is a cause of concern. Why?

Name the type of mirrors used in the design of solar furnaces. Explain how high temperature is achieved by this device.

"What was Chipko Andolan"? How did this Andolan ultimately benefit the local people and the environment?