Which organisms have been used for human welfare for centuries?

What do photosynthetic microorganisms produce?

Penicillium notatum stops the growth of

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.

What does $Rauwolfia$ $vomitoria$ produce?

Which one of the following is being utilized as a source of biodiesel in the Indian countryside?