Question

Which one of the following is a natural insecticide?
A. Pyrethrum
B. Rotenones
C . Both A and B
D . None of the above

Answer 1

Hint: Insecticide is a chemical compound used to kill insects. They include ovicides and larvicides that means they are used against insect eggs and larvae respectively. Insecticides are used in agriculture and medicine, industry, and consumers.

Complete step by step answer:
Pyrethrum is a highly effective natural insecticide. It is used in all manner of insect pests. This insecticide has an active substance for six esters. This is used as insect repellants. On the other hand, Rotenone is also used as a natural insecticide, it is a broad spectrum of natural insecticide. It damages the DNA of insects. and disturbs the electron transfer chain of mitochondria.

So, the correct option is C.

Additional information:
DDT stands for dichloro-diphenyl-trichloroethane.
Due to hydrophobic properties, in aquatic ecosystems DDT and its metabolites are absorbed by aquatic organisms and adsorbed of suspended particles, leaving little DDT dissolved in the water itself.
Once in the environment, DDT in soil lasts for a very long time. Some studies show that half the DDT in the soil breaks down within 2 years, and some studies show that it breaks down in 15 years.
Some DDT may evaporate from soil and enter the air, and some may be broken down by the sun or by microorganisms.
It was a great and cheap toxin for insects, helping plants to grow without the risk of being eaten. At the time of its creation, DDT’s toxin did not affect humans and animals and only affected the pests at that time, which increased crop harvest at the time.
Its structure is as shown:

It is a colorless, tasteless, and almost odorless crystalline chemical compound. It became infamous for its environmental impacts i.e. it caused air, water, and soil pollution.

Note: In agricultural science, lindane is used as an insecticide on fruit, vegetables, etc. It has uses in pharmaceutical treatment too. primary prefixes are used to indicate the origin of the compound in IUPAC nomenclature and suffixes are used to indicate the functional group of that molecule. The structure of lindane is,