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

Which scientists were awarded the Nobel Prize in $1945$ for establishing the efficacy of penicillin?

Bordeaux mixture was first used in:

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.

The term "antibiotic" was coined by

Who was the first discoverer of penicillin?