Find out what do the terms 'alagal bloom' and 'red-tides' signify.

What do the terms phycobiont and mycobiont-signify?

In Arrhenius equation What does the term e^(-E//RT) signify?

What do you understand by the term 'auto - protolysis' of water? What is its significance?

What do you understand by the terms (i)average velocity and (ii)root mean square velocity?

What do you mean by term 'Aromaticity?

Find out from your grandparents or other elders - What means of entertainment did they use ?

• Take a thick sheet of cardboard and make a small hole or narrow slit in its middle. • Allow sunlight to fall on the narrow slit. This gives a narrow beam of white light. • Now, take a glass prism and allow the light from the slit to fall on one of its faces as shown in Fig. • Turn the prism slowly until the light that comes out of it appears on a nearby screen. What do you observe? You will find a beautiful band of colours.

Explain what do you understand by the term 'electrodialysis?