Which phenomenon is responsible for making the path of light visible?

State and describe in brief any three main factors responsible for the rise of a new species.

Name the functional group present in each of the following organic compounds:1

(i) CH₃COCH₃ (ii) C₂H₅COOH

Which class of carbon compounds is responsible for the depletion of ozone layer at the higher level of the atmosphere?

List four properties of the image formed by a concave mirror when object is placed between focus and pole of the mirror.