A study tour of secondary class students team visited a tissue culture laboratory noticed a chemical labelled as " agar-agar" is adding to the culture medium. The same team visited an icecream factory happened to see the same material adding in the icecream mix. They asked the following questions to the teacher. (a) what is agar- agar? (b) Is it poisonous (c) What is the common purpose to using this? (d) How are they synthesized? Imagine that you are the teacher who is facing these queastions. Clarify the doubts of the students.