Suggest a suitable word for each of the following statements.
(a) Chemicals added to food to prevent the growth of the microorganism.

(b) Nitrogen-fixing micro-organisms present in the root nodules of legumes.

(c) Agents which spread pathogens from one place to another.

(d) Chemicals which kill or stop the growth of pathogens.

Question

Suggest a suitable word for each of the following statements.
(a) Chemicals added to food to prevent the growth of the microorganism.

(b) Nitrogen-fixing micro-organisms present in the root nodules of legumes.

(c) Agents which spread pathogens from one place to another.

(d) Chemicals which kill or stop the growth of pathogens.

Philoid · Accepted Answer

(a) Preservatives

Preservatives are the chemicals that control microbial growth and helps in prevents of spoilage of food. Examples – Sodium benzoate, potassium metabisulphite etc.

(b) Rhizobium

Rhizobium is a nitrogen-fixing bacteria present in nodules of roots of leguminous plants which converts atmosphere nitrogen to nitrites or nitrates that is required for plants.

(c) Carrier/Vector

Vector carry pathogens for example – female Anopheles mosquito carries Plasmodium which causes malaria.

(d) Antibiotics

Antibiotics are the chemicals which destroy or inhibit the growth of disease-causing microbes and are produced by certain bacteria or fungi.