Question

Choose the correct sequence:

• A. Chrysanthemum cinerariaefolium $\rightarrow$ Pyrethrins $\rightarrow$ Insecticide
• B. Streptomyces griseus $\rightarrow$ Streptomycin $\rightarrow$ Nematicide
• C. Streptomyces griseochromogenes $\rightarrow$ Blasticidin $\rightarrow$ Insecticide
• D. Streptomyces griseochromogenes $\rightarrow$ Blasticidin $\rightarrow$ Herbicide

Hint:

Link organisms with bioactive compounds and their agricultural applications to tackle matching/sequencing questions.

Answer 1

The Correct Option is A

Pyrethrins are natural insecticides derived from Chrysanthemum flowers, commonly used in organic farming.

Answer 2

Checking each sequence: The first option is a correctly matched chain - Chrysanthemum cinerariaefolium is the plant source of pyrethrins, a natural insecticide.
Now rule out the rest: Streptomyces griseus produces streptomycin, which is an antibacterial agent, not a nematicide, so that sequence is wrong.
Streptomyces griseochromogenes produces blasticidin-S, a fungicide used against rice blast - not an insecticide or herbicide - so both remaining sequences mislabel its use.
Only the Chrysanthemum-Pyrethrins-Insecticide chain is fully correct.