What did Fa-Hien and Wanse discuss?

Which organisms can survive at temperatures exceeding $100^{\circ}C$?

Which of the following statements is $NOT$ true regarding antibiotics?

What is the role of bacteria present in the rumen of cattle?

Which products synthesized by microorganisms are useful to mankind?

Medicines are either man-made (i.e.,synthetic) or obtained from living organisms like plants,bacteria,animals,etc.,and hence,the latter are called natural products. Sometimes,natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical: $(a)$ Penicillin $(b)$ Sulphonamide $(c)$ Vitamin-$C$ $(d)$ Growth hormone.